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2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon 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0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center 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role="listbox" class="ActionListWrap QueryBuilder-ListWrap" aria-label="Suggestions" data-action=" combobox-commit:query-builder#comboboxCommit mousedown:query-builder#resultsMousedown " data-target="query-builder.resultsList" data-persist-list=false id="query-builder-test-results" ></ul> </div> <div class="FormControl-inlineValidation" id="validation-34f00cc7-1d6b-4c20-8c1e-eff3bdc799a2" hidden="hidden"> <span class="FormControl-inlineValidation--visual"> <svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-alert-fill"> <path d="M4.855.708c.5-.896 1.79-.896 2.29 0l4.675 8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2">Search syntax tips</a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div 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--></option></form><form id="code-search-feedback-form" data-turbo="false" action="/search/feedback" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="98LlO7eU3Bb5SyzHWKLA/ZtDgMUls70StvvUgRPQ2L313GgfBAUXSYK7MsN1h1Cz5c67+wicbBWsY6bjCgtONg==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button 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code\u003c/h1\u003e\u003ca id=\"user-content-parser-for-rust-source-code\" class=\"anchor\" aria-label=\"Permalink: Parser for Rust source code\" href=\"#parser-for-rust-source-code\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/dtolnay/syn\"\u003e\u003cimg alt=\"github\" src=\"https://camo.githubusercontent.com/3e075ed85afbbe3ade1105f024663dc4b1a53d168085e9fb3c4ffa0916c29a95/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6769746875622d64746f6c6e61792f73796e2d3864613063623f7374796c653d666f722d7468652d6261646765266c6162656c436f6c6f723d353535353535266c6f676f3d676974687562\" height=\"20\" data-canonical-src=\"https://img.shields.io/badge/github-dtolnay/syn-8da0cb?style=for-the-badge\u0026amp;labelColor=555555\u0026amp;logo=github\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://crates.io/crates/syn\" rel=\"nofollow\"\u003e\u003cimg alt=\"crates.io\" src=\"https://camo.githubusercontent.com/295d3a770d97be8b622e5a694ecf0414b89fdc5cc460cd20fc00b5ae912f0a7b/68747470733a2f2f696d672e736869656c64732e696f2f6372617465732f762f73796e2e7376673f7374796c653d666f722d7468652d626164676526636f6c6f723d666338643632266c6f676f3d72757374\" height=\"20\" data-canonical-src=\"https://img.shields.io/crates/v/syn.svg?style=for-the-badge\u0026amp;color=fc8d62\u0026amp;logo=rust\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://docs.rs/syn\" rel=\"nofollow\"\u003e\u003cimg alt=\"docs.rs\" src=\"https://camo.githubusercontent.com/b3704e7be2a3b7da47b09090caf2960ed16c151a6d2fef95f5eaf278f66b858c/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f646f63732e72732d73796e2d3636633261353f7374796c653d666f722d7468652d6261646765266c6162656c436f6c6f723d353535353535266c6f676f3d646f63732e7273\" height=\"20\" data-canonical-src=\"https://img.shields.io/badge/docs.rs-syn-66c2a5?style=for-the-badge\u0026amp;labelColor=555555\u0026amp;logo=docs.rs\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://github.com/dtolnay/syn/actions?query=branch%3Amaster\"\u003e\u003cimg alt=\"build status\" src=\"https://camo.githubusercontent.com/06eb711b55e480c1a4790094a36a29b9d738d03308627724036952e521cfdeca/68747470733a2f2f696d672e736869656c64732e696f2f6769746875622f616374696f6e732f776f726b666c6f772f7374617475732f64746f6c6e61792f73796e2f63692e796d6c3f6272616e63683d6d6173746572267374796c653d666f722d7468652d6261646765\" height=\"20\" data-canonical-src=\"https://img.shields.io/github/actions/workflow/status/dtolnay/syn/ci.yml?branch=master\u0026amp;style=for-the-badge\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSyn is a parsing library for parsing a stream of Rust tokens into a syntax tree\nof Rust source code.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCurrently this library is geared toward use in Rust procedural macros, but\ncontains some APIs that may be useful more generally.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eData structures\u003c/strong\u003e — Syn provides a complete syntax tree that can represent\nany valid Rust source code. The syntax tree is rooted at \u003ca href=\"https://docs.rs/syn/2.0/syn/struct.File.html\" rel=\"nofollow\"\u003e\u003ccode\u003esyn::File\u003c/code\u003e\u003c/a\u003e which\nrepresents a full source file, but there are other entry points that may be\nuseful to procedural macros including \u003ca href=\"https://docs.rs/syn/2.0/syn/enum.Item.html\" rel=\"nofollow\"\u003e\u003ccode\u003esyn::Item\u003c/code\u003e\u003c/a\u003e, \u003ca href=\"https://docs.rs/syn/2.0/syn/enum.Expr.html\" rel=\"nofollow\"\u003e\u003ccode\u003esyn::Expr\u003c/code\u003e\u003c/a\u003e and\n\u003ca href=\"https://docs.rs/syn/2.0/syn/enum.Type.html\" rel=\"nofollow\"\u003e\u003ccode\u003esyn::Type\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eDerives\u003c/strong\u003e — Of particular interest to derive macros is \u003ca href=\"https://docs.rs/syn/2.0/syn/struct.DeriveInput.html\" rel=\"nofollow\"\u003e\u003ccode\u003esyn::DeriveInput\u003c/code\u003e\u003c/a\u003e\nwhich is any of the three legal input items to a derive macro. An example\nbelow shows using this type in a library that can derive implementations of a\nuser-defined trait.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eParsing\u003c/strong\u003e — Parsing in Syn is built around \u003ca href=\"https://docs.rs/syn/2.0/syn/parse/index.html\" rel=\"nofollow\"\u003eparser functions\u003c/a\u003e with the\nsignature \u003ccode\u003efn(ParseStream) -\u0026gt; Result\u0026lt;T\u0026gt;\u003c/code\u003e. Every syntax tree node defined by\nSyn is individually parsable and may be used as a building block for custom\nsyntaxes, or you may dream up your own brand new syntax without involving any\nof our syntax tree types.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLocation information\u003c/strong\u003e — Every token parsed by Syn is associated with a\n\u003ccode\u003eSpan\u003c/code\u003e that tracks line and column information back to the source of that\ntoken. These spans allow a procedural macro to display detailed error messages\npointing to all the right places in the user's code. There is an example of\nthis below.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eFeature flags\u003c/strong\u003e — Functionality is aggressively feature gated so your\nprocedural macros enable only what they need, and do not pay in compile time\nfor all the rest.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003eVersion requirement: Syn supports rustc 1.61 and up.\u003c/em\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/dtolnay/syn/releases\"\u003e\u003cem\u003eRelease notes\u003c/em\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eResources\u003c/h2\u003e\u003ca id=\"user-content-resources\" class=\"anchor\" aria-label=\"Permalink: Resources\" href=\"#resources\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe best way to learn about procedural macros is by writing some. Consider\nworking through \u003ca href=\"https://github.com/dtolnay/proc-macro-workshop\"\u003ethis procedural macro workshop\u003c/a\u003e to get familiar with\nthe different types of procedural macros. The workshop contains relevant links\ninto the Syn documentation as you work through each project.\u003c/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample of a derive macro\u003c/h2\u003e\u003ca id=\"user-content-example-of-a-derive-macro\" class=\"anchor\" aria-label=\"Permalink: Example of a derive macro\" href=\"#example-of-a-derive-macro\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe canonical derive macro using Syn looks like this. We write an ordinary Rust\nfunction tagged with a \u003ccode\u003eproc_macro_derive\u003c/code\u003e attribute and the name of the trait\nwe are deriving. Any time that derive appears in the user's code, the Rust\ncompiler passes their data structure as tokens into our macro. We get to execute\narbitrary Rust code to figure out what to do with those tokens, then hand some\ntokens back to the compiler to compile into the user's crate.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-toml notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"[dependencies]\nsyn = \u0026quot;2.0\u0026quot;\nquote = \u0026quot;1.0\u0026quot;\n\n[lib]\nproc-macro = true\"\u003e\u003cpre\u003e[\u003cspan class=\"pl-en\"\u003edependencies\u003c/span\u003e]\n\u003cspan class=\"pl-smi\"\u003esyn\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e2.0\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003equote\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e1.0\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e\n\n[\u003cspan class=\"pl-en\"\u003elib\u003c/span\u003e]\n\u003cspan class=\"pl-smi\"\u003eproc-macro\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-rust notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"use proc_macro::TokenStream;\nuse quote::quote;\nuse syn::{parse_macro_input, DeriveInput};\n\n#[proc_macro_derive(MyMacro)]\npub fn my_macro(input: TokenStream) -\u0026gt; TokenStream {\n // Parse the input tokens into a syntax tree\n let input = parse_macro_input!(input as DeriveInput);\n\n // Build the output, possibly using quasi-quotation\n let expanded = quote! {\n // ...\n };\n\n // Hand the output tokens back to the compiler\n TokenStream::from(expanded)\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003euse\u003c/span\u003e proc_macro\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eTokenStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003euse\u003c/span\u003e quote\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003equote\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003euse\u003c/span\u003e syn\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003eparse_macro_input\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eDeriveInput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c1\"\u003e#\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003eproc_macro_derive\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eMyMacro\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003epub\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emy_macro\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTokenStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eTokenStream\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Parse the input tokens into a syntax tree\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e input = \u003cspan class=\"pl-en\"\u003eparse_macro_input\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e!\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003einput \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eDeriveInput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Build the output, possibly using quasi-quotation\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003elet\u003c/span\u003e expanded = \u003cspan class=\"pl-en\"\u003equote\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e!\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Hand the output tokens back to the compiler\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eTokenStream\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003e\u003cspan class=\"pl-en\"\u003efrom\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003eexpanded\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"/dtolnay/syn/blob/master/examples/heapsize\"\u003e\u003ccode\u003eheapsize\u003c/code\u003e\u003c/a\u003e example directory shows a complete working implementation of a\nderive macro. The example derives a \u003ccode\u003eHeapSize\u003c/code\u003e trait which computes an estimate\nof the amount of heap memory owned by a value.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-rust notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"pub trait HeapSize {\n /// Total number of bytes of heap memory owned by `self`.\n fn heap_size_of_children(\u0026amp;self) -\u0026gt; usize;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epub\u003c/span\u003e \u003cspan class=\"pl-k\"\u003etrait\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eHeapSize\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/// Total number of bytes of heap memory owned by `self`.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eheap_size_of_children\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026amp;\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eself\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e -\u0026gt; \u003cspan class=\"pl-smi\"\u003eusize\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe derive macro allows users to write \u003ccode\u003e#[derive(HeapSize)]\u003c/code\u003e on data structures\nin their program.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-rust notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"#[derive(HeapSize)]\nstruct Demo\u0026lt;'a, T: ?Sized\u0026gt; {\n a: Box\u0026lt;T\u0026gt;,\n b: u8,\n c: \u0026amp;'a str,\n d: String,\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003e#\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003ederive\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eHeapSize\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eDemo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e'\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003ea\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e ?\u003cspan class=\"pl-smi\"\u003eSized\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ea\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eBox\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eT\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eb\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eu8\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ec\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026amp;\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e'\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003ea\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003estr\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ed\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSpans and error reporting\u003c/h2\u003e\u003ca id=\"user-content-spans-and-error-reporting\" class=\"anchor\" aria-label=\"Permalink: Spans and error reporting\" href=\"#spans-and-error-reporting\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe token-based procedural macro API provides great control over where the\ncompiler's error messages are displayed in user code. Consider the error the\nuser sees if one of their field types does not implement \u003ccode\u003eHeapSize\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-rust notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"#[derive(HeapSize)]\nstruct Broken {\n ok: String,\n bad: std::thread::Thread,\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003e#\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003ederive\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-v\"\u003eHeapSize\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eBroken\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eok\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ebad\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e std\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003ethread\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eThread\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBy tracking span information all the way through the expansion of a procedural\nmacro as shown in the \u003ccode\u003eheapsize\u003c/code\u003e example, token-based macros in Syn are able to\ntrigger errors that directly pinpoint the source of the problem.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-shell-session notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"error[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied\n --\u0026gt; src/main.rs:7:5\n |\n7 | bad: std::thread::Thread,\n | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `HeapSize` is not implemented for `std::thread::Thread`\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003eerror[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e --\u0026gt; src/main.rs:7:5\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e |\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e7 | bad: std::thread::Thread,\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `HeapSize` is not implemented for `std::thread::Thread`\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eParsing a custom syntax\u003c/h2\u003e\u003ca id=\"user-content-parsing-a-custom-syntax\" class=\"anchor\" aria-label=\"Permalink: Parsing a custom syntax\" href=\"#parsing-a-custom-syntax\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"/dtolnay/syn/blob/master/examples/lazy-static\"\u003e\u003ccode\u003elazy-static\u003c/code\u003e\u003c/a\u003e example directory shows the implementation of a\n\u003ccode\u003efunctionlike!(...)\u003c/code\u003e procedural macro in which the input tokens are parsed using\nSyn's parsing API.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe example reimplements the popular \u003ccode\u003elazy_static\u003c/code\u003e crate from crates.io as a\nprocedural macro.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-rust notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"lazy_static! {\n static ref USERNAME: Regex = Regex::new(\u0026quot;^[a-z0-9_-]{3,16}$\u0026quot;).unwrap();\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003elazy_static\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e!\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003estatic\u003c/span\u003e ref \u003cspan class=\"pl-v\"\u003eUSERNAME\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eRegex\u003c/span\u003e = \u003cspan class=\"pl-v\"\u003eRegex\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e::\u003c/span\u003enew\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\"^[a-z0-9_-]{3,16}$\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003eunwrap\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe implementation shows how to trigger custom warnings and error messages on\nthe macro input.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-shell-session notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"warning: come on, pick a more creative name\n --\u0026gt; src/main.rs:10:16\n |\n10 | static ref FOO: String = \u0026quot;lazy_static\u0026quot;.to_owned();\n | ^^^\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003ewarning: come on, pick a more creative name\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e --\u0026gt; src/main.rs:10:16\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e |\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e10 | static ref FOO: String = \"lazy_static\".to_owned();\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e | ^^^\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTesting\u003c/h2\u003e\u003ca id=\"user-content-testing\" class=\"anchor\" aria-label=\"Permalink: Testing\" href=\"#testing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen testing macros, we often care not just that the macro can be used\nsuccessfully but also that when the macro is provided with invalid input it\nproduces maximally helpful error messages. Consider using the \u003ca href=\"https://github.com/dtolnay/trybuild\"\u003e\u003ccode\u003etrybuild\u003c/code\u003e\u003c/a\u003e crate\nto write tests for errors that are emitted by your macro or errors detected by\nthe Rust compiler in the expanded code following misuse of the macro. Such tests\nhelp avoid regressions from later refactors that mistakenly make an error no\nlonger trigger or be less helpful than it used to be.\u003c/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDebugging\u003c/h2\u003e\u003ca id=\"user-content-debugging\" class=\"anchor\" aria-label=\"Permalink: Debugging\" href=\"#debugging\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen developing a procedural macro it can be helpful to look at what the\ngenerated code looks like. Use \u003ccode\u003ecargo rustc -- -Zunstable-options --pretty=expanded\u003c/code\u003e or the \u003ca href=\"https://github.com/dtolnay/cargo-expand\"\u003e\u003ccode\u003ecargo expand\u003c/code\u003e\u003c/a\u003e subcommand.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo show the expanded code for some crate that uses your procedural macro, run\n\u003ccode\u003ecargo expand\u003c/code\u003e from that crate. To show the expanded code for one of your own\ntest cases, run \u003ccode\u003ecargo expand --test the_test_case\u003c/code\u003e where the last argument is\nthe name of the test file without the \u003ccode\u003e.rs\u003c/code\u003e extension.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis write-up by Brandon W Maister discusses debugging in more detail:\n\u003ca href=\"https://quodlibetor.github.io/posts/debugging-rusts-new-custom-derive-system/\" rel=\"nofollow\"\u003eDebugging Rust's new Custom Derive system\u003c/a\u003e.\u003c/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOptional features\u003c/h2\u003e\u003ca id=\"user-content-optional-features\" class=\"anchor\" aria-label=\"Permalink: Optional features\" href=\"#optional-features\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSyn puts a lot of functionality behind optional features in order to optimize\ncompile time for the most common use cases. The following features are\navailable.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003ederive\u003c/code\u003e\u003c/strong\u003e \u003cem\u003e(enabled by default)\u003c/em\u003e — Data structures for representing the\npossible input to a derive macro, including structs and enums and types.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003efull\u003c/code\u003e\u003c/strong\u003e — Data structures for representing the syntax tree of all valid\nRust source code, including items and expressions.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003eparsing\u003c/code\u003e\u003c/strong\u003e \u003cem\u003e(enabled by default)\u003c/em\u003e — Ability to parse input tokens into a\nsyntax tree node of a chosen type.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003eprinting\u003c/code\u003e\u003c/strong\u003e \u003cem\u003e(enabled by default)\u003c/em\u003e — Ability to print a syntax tree node as\ntokens of Rust source code.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003evisit\u003c/code\u003e\u003c/strong\u003e — Trait for traversing a syntax tree.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003evisit-mut\u003c/code\u003e\u003c/strong\u003e — Trait for traversing and mutating in place a syntax tree.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003efold\u003c/code\u003e\u003c/strong\u003e — Trait for transforming an owned syntax tree.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003eclone-impls\u003c/code\u003e\u003c/strong\u003e \u003cem\u003e(enabled by default)\u003c/em\u003e — Clone impls for all syntax tree\ntypes.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003eextra-traits\u003c/code\u003e\u003c/strong\u003e — Debug, Eq, PartialEq, Hash impls for all syntax tree\ntypes.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ccode\u003eproc-macro\u003c/code\u003e\u003c/strong\u003e \u003cem\u003e(enabled by default)\u003c/em\u003e — Runtime dependency on the dynamic\nlibrary libproc_macro from rustc toolchain.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProc macro shim\u003c/h2\u003e\u003ca id=\"user-content-proc-macro-shim\" class=\"anchor\" aria-label=\"Permalink: Proc macro shim\" href=\"#proc-macro-shim\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSyn operates on the token representation provided by the \u003ca href=\"https://docs.rs/proc-macro2/1.0/proc_macro2/\" rel=\"nofollow\"\u003eproc-macro2\u003c/a\u003e crate\nfrom crates.io rather than using the compiler's built in proc-macro crate\ndirectly. This enables code using Syn to execute outside of the context of a\nprocedural macro, such as in unit tests or build.rs, and we avoid needing\nincompatible ecosystems for proc macros vs non-macro use cases.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn general all of your code should be written against proc-macro2 rather than\nproc-macro. The one exception is in the signatures of procedural macro entry\npoints, which are required by the language to use \u003ccode\u003eproc_macro::TokenStream\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe proc-macro2 crate will automatically detect and use the compiler's data\nstructures when a procedural macro is active.\u003c/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h4\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003csup\u003e\nLicensed under either of \u003ca href=\"/dtolnay/syn/blob/master/LICENSE-APACHE\"\u003eApache License, Version\n2.0\u003c/a\u003e or \u003ca href=\"/dtolnay/syn/blob/master/LICENSE-MIT\"\u003eMIT license\u003c/a\u003e at your option.\n\u003c/sup\u003e\n\u003cbr\u003e\n\u003csub\u003e\nUnless you explicitly state otherwise, any contribution intentionally submitted\nfor inclusion in this crate by you, as defined in the Apache-2.0 license, shall\nbe dual licensed as above, without any additional terms or conditions.\n\u003c/sub\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Parser for Rust source code","anchor":"parser-for-rust-source-code","htmlText":"Parser for Rust source code"},{"level":2,"text":"Resources","anchor":"resources","htmlText":"Resources"},{"level":2,"text":"Example of a derive macro","anchor":"example-of-a-derive-macro","htmlText":"Example of a derive macro"},{"level":2,"text":"Spans and error reporting","anchor":"spans-and-error-reporting","htmlText":"Spans and error reporting"},{"level":2,"text":"Parsing a custom syntax","anchor":"parsing-a-custom-syntax","htmlText":"Parsing a custom syntax"},{"level":2,"text":"Testing","anchor":"testing","htmlText":"Testing"},{"level":2,"text":"Debugging","anchor":"debugging","htmlText":"Debugging"},{"level":2,"text":"Optional features","anchor":"optional-features","htmlText":"Optional features"},{"level":2,"text":"Proc macro shim","anchor":"proc-macro-shim","htmlText":"Proc macro shim"},{"level":4,"text":"License","anchor":"license","htmlText":"License"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fdtolnay%2Fsyn"}},{"displayName":"CODE_OF_CONDUCT.md","repoName":".github","refName":"master","path":"CODE_OF_CONDUCT.md","preferredFileType":"code_of_conduct","tabName":"Code of 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id="user-content-parser-for-rust-source-code" class="anchor" aria-label="Permalink: Parser for Rust source code" href="#parser-for-rust-source-code"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://github.com/dtolnay/syn"><img alt="github" src="https://camo.githubusercontent.com/3e075ed85afbbe3ade1105f024663dc4b1a53d168085e9fb3c4ffa0916c29a95/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6769746875622d64746f6c6e61792f73796e2d3864613063623f7374796c653d666f722d7468652d6261646765266c6162656c436f6c6f723d353535353535266c6f676f3d676974687562" height="20" data-canonical-src="https://img.shields.io/badge/github-dtolnay/syn-8da0cb?style=for-the-badge&labelColor=555555&logo=github" style="max-width: 100%;"></a> <a href="https://crates.io/crates/syn" rel="nofollow"><img alt="crates.io" src="https://camo.githubusercontent.com/295d3a770d97be8b622e5a694ecf0414b89fdc5cc460cd20fc00b5ae912f0a7b/68747470733a2f2f696d672e736869656c64732e696f2f6372617465732f762f73796e2e7376673f7374796c653d666f722d7468652d626164676526636f6c6f723d666338643632266c6f676f3d72757374" height="20" data-canonical-src="https://img.shields.io/crates/v/syn.svg?style=for-the-badge&color=fc8d62&logo=rust" style="max-width: 100%;"></a> <a href="https://docs.rs/syn" rel="nofollow"><img alt="docs.rs" src="https://camo.githubusercontent.com/b3704e7be2a3b7da47b09090caf2960ed16c151a6d2fef95f5eaf278f66b858c/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f646f63732e72732d73796e2d3636633261353f7374796c653d666f722d7468652d6261646765266c6162656c436f6c6f723d353535353535266c6f676f3d646f63732e7273" height="20" data-canonical-src="https://img.shields.io/badge/docs.rs-syn-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" style="max-width: 100%;"></a> <a href="https://github.com/dtolnay/syn/actions?query=branch%3Amaster"><img alt="build status" src="https://camo.githubusercontent.com/06eb711b55e480c1a4790094a36a29b9d738d03308627724036952e521cfdeca/68747470733a2f2f696d672e736869656c64732e696f2f6769746875622f616374696f6e732f776f726b666c6f772f7374617475732f64746f6c6e61792f73796e2f63692e796d6c3f6272616e63683d6d6173746572267374796c653d666f722d7468652d6261646765" height="20" data-canonical-src="https://img.shields.io/github/actions/workflow/status/dtolnay/syn/ci.yml?branch=master&style=for-the-badge" style="max-width: 100%;"></a></p> <p dir="auto">Syn is a parsing library for parsing a stream of Rust tokens into a syntax tree of Rust source code.</p> <p dir="auto">Currently this library is geared toward use in Rust procedural macros, but contains some APIs that may be useful more generally.</p> <ul dir="auto"> <li> <p dir="auto"><strong>Data structures</strong> — Syn provides a complete syntax tree that can represent any valid Rust source code. The syntax tree is rooted at <a href="https://docs.rs/syn/2.0/syn/struct.File.html" rel="nofollow"><code>syn::File</code></a> which represents a full source file, but there are other entry points that may be useful to procedural macros including <a href="https://docs.rs/syn/2.0/syn/enum.Item.html" rel="nofollow"><code>syn::Item</code></a>, <a href="https://docs.rs/syn/2.0/syn/enum.Expr.html" rel="nofollow"><code>syn::Expr</code></a> and <a href="https://docs.rs/syn/2.0/syn/enum.Type.html" rel="nofollow"><code>syn::Type</code></a>.</p> </li> <li> <p dir="auto"><strong>Derives</strong> — Of particular interest to derive macros is <a href="https://docs.rs/syn/2.0/syn/struct.DeriveInput.html" rel="nofollow"><code>syn::DeriveInput</code></a> which is any of the three legal input items to a derive macro. An example below shows using this type in a library that can derive implementations of a user-defined trait.</p> </li> <li> <p dir="auto"><strong>Parsing</strong> — Parsing in Syn is built around <a href="https://docs.rs/syn/2.0/syn/parse/index.html" rel="nofollow">parser functions</a> with the signature <code>fn(ParseStream) -> Result<T></code>. Every syntax tree node defined by Syn is individually parsable and may be used as a building block for custom syntaxes, or you may dream up your own brand new syntax without involving any of our syntax tree types.</p> </li> <li> <p dir="auto"><strong>Location information</strong> — Every token parsed by Syn is associated with a <code>Span</code> that tracks line and column information back to the source of that token. These spans allow a procedural macro to display detailed error messages pointing to all the right places in the user's code. There is an example of this below.</p> </li> <li> <p dir="auto"><strong>Feature flags</strong> — Functionality is aggressively feature gated so your procedural macros enable only what they need, and do not pay in compile time for all the rest.</p> </li> </ul> <p dir="auto"><em>Version requirement: Syn supports rustc 1.61 and up.</em></p> <p dir="auto"><a href="https://github.com/dtolnay/syn/releases"><em>Release notes</em></a></p> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Resources</h2><a id="user-content-resources" class="anchor" aria-label="Permalink: Resources" href="#resources"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The best way to learn about procedural macros is by writing some. Consider working through <a href="https://github.com/dtolnay/proc-macro-workshop">this procedural macro workshop</a> to get familiar with the different types of procedural macros. The workshop contains relevant links into the Syn documentation as you work through each project.</p> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Example of a derive macro</h2><a id="user-content-example-of-a-derive-macro" class="anchor" aria-label="Permalink: Example of a derive macro" href="#example-of-a-derive-macro"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The canonical derive macro using Syn looks like this. We write an ordinary Rust function tagged with a <code>proc_macro_derive</code> attribute and the name of the trait we are deriving. Any time that derive appears in the user's code, the Rust compiler passes their data structure as tokens into our macro. We get to execute arbitrary Rust code to figure out what to do with those tokens, then hand some tokens back to the compiler to compile into the user's crate.</p> <div class="highlight highlight-source-toml notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="[dependencies] syn = "2.0" quote = "1.0" [lib] proc-macro = true"><pre>[<span class="pl-en">dependencies</span>] <span class="pl-smi">syn</span> = <span class="pl-s"><span class="pl-pds">"</span>2.0<span class="pl-pds">"</span></span> <span class="pl-smi">quote</span> = <span class="pl-s"><span class="pl-pds">"</span>1.0<span class="pl-pds">"</span></span> [<span class="pl-en">lib</span>] <span class="pl-smi">proc-macro</span> = <span class="pl-c1">true</span></pre></div> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="use proc_macro::TokenStream; use quote::quote; use syn::{parse_macro_input, DeriveInput}; #[proc_macro_derive(MyMacro)] pub fn my_macro(input: TokenStream) -> TokenStream { // Parse the input tokens into a syntax tree let input = parse_macro_input!(input as DeriveInput); // Build the output, possibly using quasi-quotation let expanded = quote! { // ... }; // Hand the output tokens back to the compiler TokenStream::from(expanded) }"><pre><span class="pl-k">use</span> proc_macro<span class="pl-kos">::</span><span class="pl-v">TokenStream</span><span class="pl-kos">;</span> <span class="pl-k">use</span> quote<span class="pl-kos">::</span>quote<span class="pl-kos">;</span> <span class="pl-k">use</span> syn<span class="pl-kos">::</span><span class="pl-kos">{</span>parse_macro_input<span class="pl-kos">,</span> <span class="pl-v">DeriveInput</span><span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-c1">#<span class="pl-kos">[</span>proc_macro_derive<span class="pl-kos">(</span><span class="pl-v">MyMacro</span><span class="pl-kos">)</span><span class="pl-kos">]</span></span> <span class="pl-k">pub</span> <span class="pl-k">fn</span> <span class="pl-en">my_macro</span><span class="pl-kos">(</span><span class="pl-s1">input</span><span class="pl-kos">:</span> <span class="pl-smi">TokenStream</span><span class="pl-kos">)</span> -> <span class="pl-smi">TokenStream</span> <span class="pl-kos">{</span> <span class="pl-c">// Parse the input tokens into a syntax tree</span> <span class="pl-k">let</span> input = <span class="pl-en">parse_macro_input</span><span class="pl-en">!</span><span class="pl-kos">(</span>input <span class="pl-k">as</span> <span class="pl-v">DeriveInput</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Build the output, possibly using quasi-quotation</span> <span class="pl-k">let</span> expanded = <span class="pl-en">quote</span><span class="pl-en">!</span> <span class="pl-kos">{</span> <span class="pl-c">// ...</span> <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-c">// Hand the output tokens back to the compiler</span> <span class="pl-smi">TokenStream</span><span class="pl-kos">::</span><span class="pl-en">from</span><span class="pl-kos">(</span>expanded<span class="pl-kos">)</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The <a href="/dtolnay/syn/blob/master/examples/heapsize"><code>heapsize</code></a> example directory shows a complete working implementation of a derive macro. The example derives a <code>HeapSize</code> trait which computes an estimate of the amount of heap memory owned by a value.</p> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="pub trait HeapSize { /// Total number of bytes of heap memory owned by `self`. fn heap_size_of_children(&self) -> usize; }"><pre><span class="pl-k">pub</span> <span class="pl-k">trait</span> <span class="pl-smi">HeapSize</span> <span class="pl-kos">{</span> <span class="pl-c">/// Total number of bytes of heap memory owned by `self`.</span> <span class="pl-c"></span> <span class="pl-k">fn</span> <span class="pl-en">heap_size_of_children</span><span class="pl-kos">(</span><span class="pl-c1">&</span><span class="pl-smi">self</span><span class="pl-kos">)</span> -> <span class="pl-smi">usize</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The derive macro allows users to write <code>#[derive(HeapSize)]</code> on data structures in their program.</p> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="#[derive(HeapSize)] struct Demo<'a, T: ?Sized> { a: Box<T>, b: u8, c: &'a str, d: String, }"><pre><span class="pl-c1">#<span class="pl-kos">[</span>derive<span class="pl-kos">(</span><span class="pl-v">HeapSize</span><span class="pl-kos">)</span><span class="pl-kos">]</span></span> <span class="pl-k">struct</span> <span class="pl-smi">Demo</span><span class="pl-kos"><</span><span class="pl-c1">'</span><span class="pl-ent">a</span><span class="pl-kos">,</span> <span class="pl-smi">T</span><span class="pl-kos">:</span> ?<span class="pl-smi">Sized</span><span class="pl-kos">></span> <span class="pl-kos">{</span> <span class="pl-c1">a</span><span class="pl-kos">:</span> <span class="pl-smi">Box</span><span class="pl-kos"><</span><span class="pl-smi">T</span><span class="pl-kos">></span><span class="pl-kos">,</span> <span class="pl-c1">b</span><span class="pl-kos">:</span> <span class="pl-smi">u8</span><span class="pl-kos">,</span> <span class="pl-c1">c</span><span class="pl-kos">:</span> <span class="pl-c1">&</span><span class="pl-c1">'</span><span class="pl-ent">a</span> <span class="pl-smi">str</span><span class="pl-kos">,</span> <span class="pl-c1">d</span><span class="pl-kos">:</span> <span class="pl-smi">String</span><span class="pl-kos">,</span> <span class="pl-kos">}</span></pre></div> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Spans and error reporting</h2><a id="user-content-spans-and-error-reporting" class="anchor" aria-label="Permalink: Spans and error reporting" href="#spans-and-error-reporting"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The token-based procedural macro API provides great control over where the compiler's error messages are displayed in user code. Consider the error the user sees if one of their field types does not implement <code>HeapSize</code>.</p> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="#[derive(HeapSize)] struct Broken { ok: String, bad: std::thread::Thread, }"><pre><span class="pl-c1">#<span class="pl-kos">[</span>derive<span class="pl-kos">(</span><span class="pl-v">HeapSize</span><span class="pl-kos">)</span><span class="pl-kos">]</span></span> <span class="pl-k">struct</span> <span class="pl-smi">Broken</span> <span class="pl-kos">{</span> <span class="pl-c1">ok</span><span class="pl-kos">:</span> <span class="pl-smi">String</span><span class="pl-kos">,</span> <span class="pl-c1">bad</span><span class="pl-kos">:</span> std<span class="pl-kos">::</span>thread<span class="pl-kos">::</span><span class="pl-smi">Thread</span><span class="pl-kos">,</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">By tracking span information all the way through the expansion of a procedural macro as shown in the <code>heapsize</code> example, token-based macros in Syn are able to trigger errors that directly pinpoint the source of the problem.</p> <div class="highlight highlight-text-shell-session notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="error[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied --> src/main.rs:7:5 | 7 | bad: std::thread::Thread, | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `HeapSize` is not implemented for `std::thread::Thread`"><pre><span class="pl-c1">error[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied</span> <span class="pl-c1"> --> src/main.rs:7:5</span> <span class="pl-c1"> |</span> <span class="pl-c1">7 | bad: std::thread::Thread,</span> <span class="pl-c1"> | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `HeapSize` is not implemented for `std::thread::Thread`</span></pre></div> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Parsing a custom syntax</h2><a id="user-content-parsing-a-custom-syntax" class="anchor" aria-label="Permalink: Parsing a custom syntax" href="#parsing-a-custom-syntax"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <a href="/dtolnay/syn/blob/master/examples/lazy-static"><code>lazy-static</code></a> example directory shows the implementation of a <code>functionlike!(...)</code> procedural macro in which the input tokens are parsed using Syn's parsing API.</p> <p dir="auto">The example reimplements the popular <code>lazy_static</code> crate from crates.io as a procedural macro.</p> <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="lazy_static! { static ref USERNAME: Regex = Regex::new("^[a-z0-9_-]{3,16}$").unwrap(); }"><pre><span class="pl-en">lazy_static</span><span class="pl-en">!</span> <span class="pl-kos">{</span> <span class="pl-k">static</span> ref <span class="pl-v">USERNAME</span><span class="pl-kos">:</span> <span class="pl-v">Regex</span> = <span class="pl-v">Regex</span><span class="pl-kos">::</span>new<span class="pl-kos">(</span><span class="pl-s">"^[a-z0-9_-]{3,16}$"</span><span class="pl-kos">)</span><span class="pl-kos">.</span>unwrap<span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">The implementation shows how to trigger custom warnings and error messages on the macro input.</p> <div class="highlight highlight-text-shell-session notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="warning: come on, pick a more creative name --> src/main.rs:10:16 | 10 | static ref FOO: String = "lazy_static".to_owned(); | ^^^"><pre><span class="pl-c1">warning: come on, pick a more creative name</span> <span class="pl-c1"> --> src/main.rs:10:16</span> <span class="pl-c1"> |</span> <span class="pl-c1">10 | static ref FOO: String = "lazy_static".to_owned();</span> <span class="pl-c1"> | ^^^</span></pre></div> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Testing</h2><a id="user-content-testing" class="anchor" aria-label="Permalink: Testing" href="#testing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When testing macros, we often care not just that the macro can be used successfully but also that when the macro is provided with invalid input it produces maximally helpful error messages. Consider using the <a href="https://github.com/dtolnay/trybuild"><code>trybuild</code></a> crate to write tests for errors that are emitted by your macro or errors detected by the Rust compiler in the expanded code following misuse of the macro. Such tests help avoid regressions from later refactors that mistakenly make an error no longer trigger or be less helpful than it used to be.</p> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Debugging</h2><a id="user-content-debugging" class="anchor" aria-label="Permalink: Debugging" href="#debugging"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When developing a procedural macro it can be helpful to look at what the generated code looks like. Use <code>cargo rustc -- -Zunstable-options --pretty=expanded</code> or the <a href="https://github.com/dtolnay/cargo-expand"><code>cargo expand</code></a> subcommand.</p> <p dir="auto">To show the expanded code for some crate that uses your procedural macro, run <code>cargo expand</code> from that crate. To show the expanded code for one of your own test cases, run <code>cargo expand --test the_test_case</code> where the last argument is the name of the test file without the <code>.rs</code> extension.</p> <p dir="auto">This write-up by Brandon W Maister discusses debugging in more detail: <a href="https://quodlibetor.github.io/posts/debugging-rusts-new-custom-derive-system/" rel="nofollow">Debugging Rust's new Custom Derive system</a>.</p> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Optional features</h2><a id="user-content-optional-features" class="anchor" aria-label="Permalink: Optional features" href="#optional-features"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Syn puts a lot of functionality behind optional features in order to optimize compile time for the most common use cases. The following features are available.</p> <ul dir="auto"> <li><strong><code>derive</code></strong> <em>(enabled by default)</em> — Data structures for representing the possible input to a derive macro, including structs and enums and types.</li> <li><strong><code>full</code></strong> — Data structures for representing the syntax tree of all valid Rust source code, including items and expressions.</li> <li><strong><code>parsing</code></strong> <em>(enabled by default)</em> — Ability to parse input tokens into a syntax tree node of a chosen type.</li> <li><strong><code>printing</code></strong> <em>(enabled by default)</em> — Ability to print a syntax tree node as tokens of Rust source code.</li> <li><strong><code>visit</code></strong> — Trait for traversing a syntax tree.</li> <li><strong><code>visit-mut</code></strong> — Trait for traversing and mutating in place a syntax tree.</li> <li><strong><code>fold</code></strong> — Trait for transforming an owned syntax tree.</li> <li><strong><code>clone-impls</code></strong> <em>(enabled by default)</em> — Clone impls for all syntax tree types.</li> <li><strong><code>extra-traits</code></strong> — Debug, Eq, PartialEq, Hash impls for all syntax tree types.</li> <li><strong><code>proc-macro</code></strong> <em>(enabled by default)</em> — Runtime dependency on the dynamic library libproc_macro from rustc toolchain.</li> </ul> <br> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Proc macro shim</h2><a id="user-content-proc-macro-shim" class="anchor" aria-label="Permalink: Proc macro shim" href="#proc-macro-shim"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Syn operates on the token representation provided by the <a href="https://docs.rs/proc-macro2/1.0/proc_macro2/" rel="nofollow">proc-macro2</a> crate from crates.io rather than using the compiler's built in proc-macro crate directly. This enables code using Syn to execute outside of the context of a procedural macro, such as in unit tests or build.rs, and we avoid needing incompatible ecosystems for proc macros vs non-macro use cases.</p> <p dir="auto">In general all of your code should be written against proc-macro2 rather than proc-macro. The one exception is in the signatures of procedural macro entry points, which are required by the language to use <code>proc_macro::TokenStream</code>.</p> <p dir="auto">The proc-macro2 crate will automatically detect and use the compiler's data structures when a procedural macro is active.</p> <br> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">License</h4><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 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