rust/tests/ui/impl-trait/method-suggestion-no-duplic...

// issue #21405
struct Foo;

fn foo<F>(f: F) where F: FnMut(Foo) {}

fn main() {
    foo(|s| s.is_empty());
    //~^ ERROR no method named `is_empty` found
}
Avoid suggesting traits multiple times. This is clearly useless, the user doesn't need to know that they could implement/import `foo::bar::Baz` 4 times. Fixes #21405. 2015-01-20 20:09:50 +08:00			`// issue #21405`
Try to only suggest implementable traits for method calls. That is, when offering suggestions for unresolved method calls, avoid suggesting traits for which implementing the trait for the receiver type either makes little sense (e.g. type errors, or sugared unboxed closures), or violates coherence. The latter is approximated by ensuring that at least one of `{receiver type, trait}` is local. This isn't precisely correct due to multidispatch, but the error messages one encounters in such situation are useless more often than not; it is better to be conservative and miss some cases, than have overly many false positives (e.g. writing `some_slice.map(\|x\| ...)` uselessly suggested that one should implement `IteratorExt` for `&[T]`, while the correct fix is to call `.iter()`). Closes #21420. 2015-01-27 08:29:30 +08:00			`struct Foo;`

			`fn foo<F>(f: F) where F: FnMut(Foo) {}`
Avoid suggesting traits multiple times. This is clearly useless, the user doesn't need to know that they could implement/import `foo::bar::Baz` 4 times. Fixes #21405. 2015-01-20 20:09:50 +08:00
			`fn main() {`
			`foo(\|s\| s.is_empty());`
Fix ICE that occurs when an associated const is ambiguous. Also change several error messages to refer to "items" rather than "methods", since associated items that require resolution during type checking are not always methods. 2015-05-03 13:30:59 +08:00			//~^ ERROR no method named `is_empty` found
Avoid suggesting traits multiple times. This is clearly useless, the user doesn't need to know that they could implement/import `foo::bar::Baz` 4 times. Fixes #21405. 2015-01-20 20:09:50 +08:00			`}`