1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/const-generics/generic_const_exprs/function-call.rs b/tests/ui/const-generics/generic_const_exprs/function-call.rs
new file mode 100644
index 00000000000..3c866333d60
--- /dev/null
+++ b/tests/ui/const-generics/generic_const_exprs/function-call.rs
@@ -0,0 +1,20 @@
+// check-pass
+// compile-flags: -Zdeduplicate-diagnostics=yes
+
+const fn foo<T>() -> usize {
+    // We might instead branch on `std::mem::size_of::<*mut T>() < 8` here,
+    // which would cause this function to fail on 32 bit systems.
+    if false {
+        std::mem::size_of::<T>()
+    } else {
+        8
+    }
+}
+
+fn test<T>() {
+    let _ = [0; foo::<T>()];
+    //~^ WARN cannot use constants which depend on generic parameters in types
+    //~| WARN this was previously accepted by the compiler but is being phased out
+}
+
+fn main() {}