1 files changed, 9 insertions, 0 deletions
diff --git a/tests/ui/const-generics/generic_const_exprs/issue-105257.rs b/tests/ui/const-generics/generic_const_exprs/issue-105257.rs
new file mode 100644
index 000000000..d8b23bc01
--- /dev/null
+++ b/tests/ui/const-generics/generic_const_exprs/issue-105257.rs
@@ -0,0 +1,9 @@
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+trait Trait<T> {
+    fn fnc<const N: usize = "">(&self) {} //~ERROR defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
+    fn foo<const N: usize = { std::mem::size_of::<T>() }>(&self) {} //~ERROR defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
+}
+
+fn main() {}