(Partially) fix handling of type params depending on type params #5124
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If the first type parameter gets inferred, that's still not handled correctly; it'll require some more refactoring: E.g. if we have `Thing<T, F=fn() -> T>` and then instantiate `Thing<_>`, that gets turned into `Thing<_, fn() -> _>` before the `_` is instantiated into a type variable -- so afterwards, we have two type variables without any connection to each other.
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bors r+ |
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This should fix #2880. |
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If the first type parameter gets inferred, that's still not handled correctly; it'll require some more refactoring: E.g. if we have
Thing<T, F=fn() -> T>and then instantiateThing<_>, that gets turned intoThing<_, fn() -> _>before the_is instantiated into a type variable -- so afterwards, we have two type variables without any connection to each other.