ty::Error does not match other types for region constraints

This commit is contained in:
Michael Goulet 2022-08-17 17:23:52 +00:00
parent 86c6ebee8f
commit fc7fc0fae5
3 changed files with 36 additions and 1 deletions

View file

@ -174,7 +174,14 @@ impl<'tcx> TypeRelation<'tcx> for Match<'tcx> {
#[instrument(skip(self), level = "debug")]
fn tys(&mut self, pattern: Ty<'tcx>, value: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
if pattern == value { Ok(pattern) } else { relate::super_relate_tys(self, pattern, value) }
if let ty::Error(_) = pattern.kind() {
// Unlike normal `TypeRelation` rules, `ty::Error` does not equal any type.
self.no_match()
} else if pattern == value {
Ok(pattern)
} else {
relate::super_relate_tys(self, pattern, value)
}
}
#[instrument(skip(self), level = "debug")]

View file

@ -0,0 +1,16 @@
trait HandlerFamily {
type Target;
}
struct HandlerWrapper<H: HandlerFamily>(H);
impl<H: HandlerFamily> HandlerWrapper<H> {
pub fn set_handler(&self, handler: &H::Target)
where
T: Send + Sync + 'static,
//~^ ERROR cannot find type `T` in this scope
{
}
}
fn main() {}

View file

@ -0,0 +1,12 @@
error[E0412]: cannot find type `T` in this scope
--> $DIR/outlives-with-missing.rs:10:9
|
LL | impl<H: HandlerFamily> HandlerWrapper<H> {
| - similarly named type parameter `H` defined here
...
LL | T: Send + Sync + 'static,
| ^ help: a type parameter with a similar name exists: `H`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0412`.