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Associated types are used as inputs for multidispatch #18437

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nikomatsakis opened this issue Oct 29, 2014 · 3 comments
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Associated types are used as inputs for multidispatch #18437

nikomatsakis opened this issue Oct 29, 2014 · 3 comments

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@nikomatsakis
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Currently associated types are expanded into synthetic type parameters that also lie in the same 'space' as the normal trait type parameters. This means they will be treated like inputs rather than outputs. We should fix this.
@alexcrichton alexcrichton mentioned this issue Oct 29, 2014
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@nikomatsakis
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This is important for 1.0 primarily because we want to prevent people from doing things like implementing Deref<E=int> and Deref<E=uint> for the same type.

@nikomatsakis
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This is fixed now.

@nikomatsakis nikomatsakis mentioned this issue Jan 2, 2015
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@nikomatsakis
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For posterity: it was fixed during the rewrite of associated types to not use synthetic type parameters.

lnicola pushed a commit to lnicola/rust that referenced this issue Nov 4, 2024
@Veykril
Merge pull request rust-lang#18437 from sam-mccall/publish_fixture
7ca05b5 
Publish test-fixture => ra_ap_test_fixture
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