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Fix parse error message for meta items Addresses https://github.com/rust-lang/rust/issues/122796#issuecomment-2010803906, cc [``@]Thomasdezeeuw.`` For attrs inside of a macro like `#[doc(alias = $ident)]` or `#[cfg(feature = $ident)]` where `$ident` is a macro metavariable of fragment kind `ident`, we used to say the following when expanded (with `$ident` ⟼ `ident`): ``` error: expected unsuffixed literal or identifier, found `ident` --> weird.rs:6:19 | 6 | #[cfg(feature = $ident)] | ^^^^^^ ... 11 | m!(id); | ------ in this macro invocation | = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info) ``` This was incorrect and caused confusion, justifiably so (see #122796). In this position, we only accept/expect *unsuffixed literals* which consist of numeric & string literals as well as the boolean literals / the keywords / the reserved identifiers `false` & `true` **but not** arbitrary identifiers. Furthermore, we used to suggest garbage when encountering unexpected non-identifier tokens: ``` error: expected unsuffixed literal, found `-` --> weird.rs:16:17 | 16 | #[cfg(feature = -1)] | ^ | help: surround the identifier with quotation marks to parse it as a string | 16 | #[cfg(feature =" "-1)] | + + ``` Now we no longer do. |
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