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-rw-r--r--tests/ui/coherence/coherence-with-generator.rs24
1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/coherence/coherence-with-generator.rs b/tests/ui/coherence/coherence-with-generator.rs
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index 000000000..5eb8dc2a4
--- /dev/null
+++ b/tests/ui/coherence/coherence-with-generator.rs
@@ -0,0 +1,24 @@
+// Test that encountering closures during coherence does not cause issues.
+#![feature(type_alias_impl_trait, generators)]
+#![cfg_attr(specialized, feature(specialization))]
+#![allow(incomplete_features)]
+
+// revisions: stock specialized
+// [specialized]check-pass
+
+type OpaqueGenerator = impl Sized;
+fn defining_use() -> OpaqueGenerator {
+ || {
+ for i in 0..10 {
+ yield i;
+ }
+ }
+}
+
+struct Wrapper<T>(T);
+trait Trait {}
+impl Trait for Wrapper<OpaqueGenerator> {}
+impl<T: Sync> Trait for Wrapper<T> {}
+//[stock]~^ ERROR conflicting implementations of trait `Trait` for type `Wrapper<OpaqueGenerator>`
+
+fn main() {}