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Duplicating names in a type parameter should be illegal. #15969

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TyOverby opened this issue Jul 25, 2014 · 1 comment
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Duplicating names in a type parameter should be illegal. #15969

TyOverby opened this issue Jul 25, 2014 · 1 comment

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@TyOverby
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The following function compiles:

fn foo<A: Share, A>(a: A) -> A{ a }

When unused the compiler issues the standard unused code warning.

As far as I can tell, there is no way to actually use the function without annotating the types for everything (foo::<&str, uint>(5u)) because otherwise the compiler can't infer the type of the function.
@huonw
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huonw commented Jul 25, 2014

Dupe of #11658.

@huonw huonw closed this as completed Jul 25, 2014
@ben0x539 ben0x539 mentioned this issue Sep 26, 2014
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bors added a commit to rust-lang-ci/rust that referenced this issue Jan 21, 2024
@bors
Auto merge of rust-lang#16314 - Urhengulas:macro_rule-as-macro-name, …
c820980 
…r=Veykril

`macro_rules` as macro name

This PR makes RA parse `macro_rules! {}` (note the missing identifier) as a `MACRO_CALL` instead of `MACRO_RULES`.

Fixes rust-lang#15969.
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