update fragment specifiers/allow spaces in metavariable declarations #49
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- Add `pat_param` specifier from 2021 edition - Add `expr_2021` specifier from 2024 edition: https://doc.rust-lang.org/edition-guide/rust-2024/macro-fragment-specifiers.html - This specifier is currently unstable but the name seems to be confirmed: rust-lang/rust#123742 (comment) - Require a word boundary (`\b`) at the end of the specifier - Replace `[A-Za-z0-9_]` with `\w` - Allow spaces before and after the `:` in metavariable declarations - Add tests for the new specifiers and spacing
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I came across a Rust project with macros that put a space after the colon in a macro metavariable declaration (e.g.
$var: literal) and noticed the fragment specifier didn't get thevariable.other.metavariable.specifier.rustscope. Additionally,pat_paramisn't in the list sopatwould get the scope but not_param. Plus Rust 2024 edition is adding anexpr_2021fragment specifier for backward compatibility with macros written for 2021 edition.pat_paramspecifier from 2021 editionexpr_2021specifier from 2024 edition: https://doc.rust-lang.org/edition-guide/rust-2024/macro-fragment-specifiers.htmlexprmacro fragment specifier for Rust 2024 rust-lang/rust#123742 (comment)\b) at the end of the specifier[A-Za-z0-9_]with\w:in metavariable declarations