2 files changed, 24 insertions, 0 deletions

diff --git a/src/test/ui/const-generics/issues/auxiliary/const_generic_issues_lib.rs b/src/test/ui/const-generics/issues/auxiliary/const_generic_issues_lib.rs
new file mode 100644
index 000000000..6a10ee267
--- /dev/null
+++ b/src/test/ui/const-generics/issues/auxiliary/const_generic_issues_lib.rs
@@ -0,0 +1,15 @@
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+// All of these three items must be in `lib2` to reproduce the error
+
+pub trait TypeFn {
+    type Output;
+}
+
+pub struct GenericType<const B: i8>;
+
+// Removing the braces around `42` resolves the crash
+impl TypeFn for GenericType<{ 40 + 2 }> {
+    type Output = ();
+}
diff --git a/src/test/ui/const-generics/issues/auxiliary/impl-const.rs b/src/test/ui/const-generics/issues/auxiliary/impl-const.rs
new file mode 100644
index 000000000..de3a40860
--- /dev/null
+++ b/src/test/ui/const-generics/issues/auxiliary/impl-const.rs
@@ -0,0 +1,9 @@
+#![feature(generic_const_exprs)]
+
+pub struct Num<const N: usize>;
+
+// Braces around const expression causes crash
+impl Num<{5}> {
+    pub fn five(&self) {
+    }
+}