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b4c4664167
Do not erase late bound regions when selecting inherent associated types In the fix for #97156 we would want the following code: ```rust #![feature(inherent_associated_types)] #![allow(incomplete_features)] struct Foo<T>(T); impl Foo<fn(&'static ())> { type Assoc = u32; } trait Other {} impl Other for u32 {} // FIXME(inherent_associated_types): Avoid emitting two diagnostics (they only differ in span). // FIXME(inherent_associated_types): Enhancement: Spruce up the diagnostic by saying something like // "implementation is not general enough" as is done for traits via // `try_report_trait_placeholder_mismatch`. fn bar(_: Foo<for<'a> fn(&'a ())>::Assoc) {} //~^ ERROR mismatched types //~| ERROR mismatched types fn main() {} ``` to fail with ... ``` error[E0220]: associated type `Assoc` not found for `Foo<for<'a> fn(&'a ())>` in the current scope --> tests/ui/associated-inherent-types/issue-109789.rs:18:36 | 4 | struct Foo<T>(T); | ------------- associated item `Assoc` not found for this struct ... 18 | fn bar(_: Foo<for<'a> fn(&'a ())>::Assoc) {} | ^^^^^ associated item not found in `Foo<for<'a> fn(&'a ())>` | = note: the associated type was found for - `Foo<fn(&'static ())>` error: aborting due to previous error For more information about this error, try `rustc --explain E0220`. ``` This PR fixes the ICE we are currently getting "was a subtype of Foo<Binder(fn(&ReStatic ()), [])> during selection but now it is not" Also fixes #112631 r? `@lcnr` |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.