bjoernager/rust
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Detect attempts to expand a macro to a match arm again

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Because a macro invocation can expand to a never pattern, we can't rule
out a `arm!(),` arm at parse time. Instead we detect that case at
expansion time, if the macro tries to output a pattern followed by `=>`.
This commit is contained in:
Nadrieril 2023-11-27 00:50:51 +01:00
parent 80bdcbf50a
commit 0bfebc6105
8 changed files with 27 additions and 29 deletions
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2
compiler/rustc_parse/messages.ftl
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@ -456,8 +456,6 @@ parse_macro_expands_to_adt_field = macros cannot expand to {$adt_ty} fields
parse_macro_expands_to_enum_variant = macros cannot expand to enum variants
parse_macro_expands_to_match_arm = macros cannot expand to match arms
parse_macro_invocation_visibility = can't qualify macro invocation with `pub`
.suggestion = remove the visibility
.help = try adjusting the macro to put `{$vis}` inside the invocation