787bd3c551
8122: Make bare underscore token an Ident rather than Punct in proc-macro r=edwin0cheng a=kevinmehall In rustc and proc-macro2, a bare `_` token is parsed for procedural macro purposes as `Ident` rather than `Punct` (see https://github.com/rust-lang/rust/pull/48842). This changes rust-analyzer to match rustc's behavior and implementation by handling `_` as an Ident in token trees, but explicitly preventing `$x:ident` from matching it in MBE. proc macro crate: ```rust #[proc_macro] pub fn input(input: proc_macro::TokenStream) -> proc_macro::TokenStream { dbg!(input) } ``` test crate: ```rust test_proc_macro::input!(_); ``` output (rustc): ```rust [test-proc-macro/src/lib.rs:10] input = TokenStream [ Ident { ident: "_", span: #0 bytes(173..174), }, ] ``` output (rust-analyzer before this change): ```rust [test-proc-macro/src/lib.rs:10] input = TokenStream [ Punct { ch: '_', spacing: Joint, span: 4294967295, }, ] ``` output (rust-analyzer after this change): ```rust [test-proc-macro/src/lib.rs:10] input = TokenStream [ Ident { ident: "_", span: 4294967295, }, ] ``` Co-authored-by: Kevin Mehall <km@kevinmehall.net>
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