diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/librustc_typeck/check/mod.rs | 3 | ||||
| -rw-r--r-- | src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs | 17 |
2 files changed, 18 insertions, 2 deletions
diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs index d1a8a6f6026..96a097695fa 100644 --- a/src/librustc_typeck/check/mod.rs +++ b/src/librustc_typeck/check/mod.rs @@ -2767,8 +2767,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { let mut opaque_types = self.opaque_types.borrow_mut(); for (ty, decl) in opaque_type_map { - let old_value = opaque_types.insert(ty, decl); - assert!(old_value.is_none(), "instantiated twice: {:?}/{:?}", ty, decl); + let _ = opaque_types.insert(ty, decl); } value diff --git a/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs b/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs new file mode 100644 index 00000000000..12eb75ae4c0 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/issue-65679-inst-opaque-ty-from-val-twice.rs @@ -0,0 +1,17 @@ +// check-pass + +#![feature(type_alias_impl_trait)] + +type T = impl Sized; +// The concrete type referred by impl-trait-type-alias(`T`) is guaranteed +// to be the same as where it occurs, whereas `impl Trait`'s instance is location sensitive; +// so difference assertion should not be declared on impl-trait-type-alias's instances. +// for details, check RFC-2515: +// https://github.com/rust-lang/rfcs/blob/master/text/2515-type_alias_impl_trait.md + +fn take(_: fn() -> T) {} + +fn main() { + take(|| {}); + take(|| {}); +} |