1 files changed, 23 insertions, 0 deletions
diff --git a/tests/ui/pattern/usefulness/issue-40221.stderr b/tests/ui/pattern/usefulness/issue-40221.stderr
new file mode 100644
index 000000000..4973e42b0
--- /dev/null
+++ b/tests/ui/pattern/usefulness/issue-40221.stderr
@@ -0,0 +1,23 @@
+error[E0004]: non-exhaustive patterns: `P::C(PC::QA)` not covered
+  --> $DIR/issue-40221.rs:11:11
+   |
+LL |     match proto {
+   |           ^^^^^ pattern `P::C(PC::QA)` not covered
+   |
+note: `P` defined here
+  --> $DIR/issue-40221.rs:2:5
+   |
+LL | enum P {
+   |      -
+LL |     C(PC),
+   |     ^ not covered
+   = note: the matched value is of type `P`
+help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
+   |
+LL ~         P::C(PC::Q) => (),
+LL ~         P::C(PC::QA) => todo!(),
+   |
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0004`.