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Allow attr entries to declare list of alternatives for List and NamedValueStr

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Modify `AttributeTemplate` to support list of alternatives for list and name value attribute styles.

Suggestions now provide more correct suggested code:

```
error[E0805]: malformed `used` attribute input
  --> $DIR/used_with_multi_args.rs:3:1
   |
LL | #[used(compiler, linker)]
   | ^^^^^^------------------^
   |       |
   |       expected a single argument here
   |
help: try changing it to one of the following valid forms of the attribute
   |
LL - #[used(compiler, linker)]
LL + #[used(compiler)]
   |
LL - #[used(compiler, linker)]
LL + #[used(linker)]
   |
LL - #[used(compiler, linker)]
LL + #[used]
   |
```

instead of the prior "masking" of the lack of this feature by suggesting pipe-separated lists:

```
error[E0805]: malformed `used` attribute input
  --> $DIR/used_with_multi_args.rs:3:1
   |
LL | #[used(compiler, linker)]
   | ^^^^^^------------------^
   |       |
   |       expected a single argument here
   |
help: try changing it to one of the following valid forms of the attribute
   |
LL - #[used(compiler, linker)]
LL + #[used(compiler|linker)]
   |
LL - #[used(compiler, linker)]
LL + #[used]
   |
```
This commit is contained in:
Esteban Küber
2025-08-11 01:46:34 +00:00
parent 577166503a
commit 189f264926
43 changed files with 711 additions and 272 deletions
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2
compiler/rustc_attr_parsing/src/attributes/cfg.rs
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@@ -16,7 +16,7 @@ use crate::{
CfgMatchesLintEmitter, fluent_generated, parse_version, session_diagnostics, try_gate_cfg,
};
pub const CFG_TEMPLATE: AttributeTemplate = template!(List: "predicate");
pub const CFG_TEMPLATE: AttributeTemplate = template!(List: &["predicate"]);
pub fn parse_cfg_attr<'c, S: Stage>(
cx: &'c mut AcceptContext<'_, '_, S>,