1 files changed, 9 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-30589.rs b/tests/ui/issues/issue-30589.rs
new file mode 100644
index 000000000..94eb58399
--- /dev/null
+++ b/tests/ui/issues/issue-30589.rs
@@ -0,0 +1,9 @@
+use std::fmt;
+
+impl fmt::Display for DecoderError { //~ ERROR cannot find type `DecoderError` in this scope
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Missing data: {}", self.0)
+    }
+}
+fn main() {
+}