1 files changed, 15 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-21332.stderr b/tests/ui/issues/issue-21332.stderr
new file mode 100644
index 000000000..0e1beebf2
--- /dev/null
+++ b/tests/ui/issues/issue-21332.stderr
@@ -0,0 +1,15 @@
+error[E0053]: method `next` has an incompatible type for trait
+  --> $DIR/issue-21332.rs:5:27
+   |
+LL |     fn next(&mut self) -> Result<i32, i32> { Ok(7) }
+   |                           ^^^^^^^^^^^^^^^^
+   |                           |
+   |                           expected enum `Option`, found enum `Result`
+   |                           help: change the output type to match the trait: `Option<i32>`
+   |
+   = note: expected signature `fn(&mut S) -> Option<i32>`
+              found signature `fn(&mut S) -> Result<i32, i32>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0053`.