1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs b/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs
new file mode 100644
index 000000000..6093fc70b
--- /dev/null
+++ b/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs
@@ -0,0 +1,22 @@
+#![feature(generic_const_exprs, generic_arg_infer)]
+#![allow(incomplete_features)]
+
+// minimized repro for #105205
+//
+// the `foo::<_, L>` call results in a `WellFormed(_)` obligation and a
+// `ConstEvaluatable(Unevaluated(_ + 1 + L))` obligation. Attempting to fulfill the latter
+// unifies the `_` with `Expr(L - 1)` from the paramenv which turns the `WellFormed`
+// obligation into `WellFormed(Expr(L - 1))`
+
+fn foo<const N: usize, const M: usize>(_: [(); N + 1 + M]) {}
+
+fn ice<const L: usize>()
+where
+    [(); (L - 1) + 1 + L]:,
+{
+    foo::<_, L>([(); L + 1 + L]);
+    //~^ ERROR: mismatched types
+    //~^^ ERROR: unconstrained generic constant
+}
+
+fn main() {}