2 files changed, 12 insertions, 0 deletions
diff --git a/src/test/ui/parser/issue-104620.rs b/src/test/ui/parser/issue-104620.rs
new file mode 100644
index 00000000000..f49476c4408
--- /dev/null
+++ b/src/test/ui/parser/issue-104620.rs
@@ -0,0 +1,4 @@
+#![feature(rustc_attrs)]
+
+#![rustc_dummy=5z] //~ ERROR unexpected expression: `5z`
+fn main() {}
diff --git a/src/test/ui/parser/issue-104620.stderr b/src/test/ui/parser/issue-104620.stderr
new file mode 100644
index 00000000000..d06a6b2554b
--- /dev/null
+++ b/src/test/ui/parser/issue-104620.stderr
@@ -0,0 +1,8 @@
+error: unexpected expression: `5z`
+  --> $DIR/issue-104620.rs:3:16
+   |
+LL | #![rustc_dummy=5z]
+   |                ^^
+
+error: aborting due to previous error
+