1 files changed, 13 insertions, 0 deletions

diff --git a/src/test/ui/parser/issues/issue-21153.stderr b/src/test/ui/parser/issues/issue-21153.stderr
new file mode 100644
index 000000000..cbfa9ded3
--- /dev/null
+++ b/src/test/ui/parser/issues/issue-21153.stderr
@@ -0,0 +1,13 @@
+error: expected one of `!` or `::`, found `=`
+  --> $DIR/issue-21153.rs:2:10
+   |
+LL | trait MyTrait<T>: Iterator {
+   |                            - while parsing this item list starting here
+LL |     Item = T;
+   |          ^ expected one of `!` or `::`
+LL |
+LL | }
+   | - the item list ends here
+
+error: aborting due to previous error
+