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-rw-r--r--src/test/ui/issues/issue-54966.rs6
-rw-r--r--src/test/ui/issues/issue-54966.stderr9
2 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-54966.rs b/src/test/ui/issues/issue-54966.rs
new file mode 100644
index 00000000000..0ed3c4b3ca9
--- /dev/null
+++ b/src/test/ui/issues/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() {}
diff --git a/src/test/ui/issues/issue-54966.stderr b/src/test/ui/issues/issue-54966.stderr
new file mode 100644
index 00000000000..aa9a61cb592
--- /dev/null
+++ b/src/test/ui/issues/issue-54966.stderr
@@ -0,0 +1,9 @@
+error[E0412]: cannot find type `Oper` in this scope
+  --> $DIR/issue-54966.rs:3:27
+   |
+LL | fn generate_duration() -> Oper<impl FnMut()> {}
+   |                           ^^^^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0412`.