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-rw-r--r--src/test/ui/impl-trait/issue-54966.rs6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/issue-54966.rs b/src/test/ui/impl-trait/issue-54966.rs
new file mode 100644
index 000000000..0ed3c4b3c
--- /dev/null
+++ b/src/test/ui/impl-trait/issue-54966.rs
@@ -0,0 +1,6 @@
+// issue-54966: ICE returning an unknown type with impl FnMut
+
+fn generate_duration() -> Oper<impl FnMut()> {}
+//~^ ERROR cannot find type `Oper` in this scope
+
+fn main() {}