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rustc gets confused with classes that implement polymorphic ifaces #2936

eholk opened this Issue · 4 comments

3 participants


Here's a test case, and the compile error.

@catamorphism catamorphism was assigned

It looks like the type parameter is not being instantiated to a fresh tvar. A mite confusing.


As I mentioned to @nikomatsakis earlier, I have a fix for this... but it breaks other test cases, so I'm still trying to figure out whether my fix was wrong or I exposed another bug.


@catamorphism sorry forgot to look at that with you today. Maybe you can gist the patch?


(or just push it to your local repo)

@catamorphism catamorphism added a commit that closed this issue
@catamorphism catamorphism In ty::impl_traits, treat structs properly
Treat structs just like impls: use their associated list of
trait refs to get the list of traits that one of them implements.
I don't understand what was happening before, but it was wrong.

Closes #2936
@catamorphism catamorphism was unassigned by eholk
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