1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/feature-gates/feature-gate-min_const_fn.rs b/src/test/ui/feature-gates/feature-gate-min_const_fn.rs
new file mode 100644
index 000000000..8f9b43300
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-min_const_fn.rs
@@ -0,0 +1,35 @@
+// Test use of min_const_fn without feature gate.
+
+const fn foo() -> usize { 0 } // stabilized
+
+trait Foo {
+    const fn foo() -> u32; //~ ERROR functions in traits cannot be declared const
+    const fn bar() -> u32 { 0 } //~ ERROR functions in traits cannot be declared const
+}
+
+impl Foo for u32 {
+    const fn foo() -> u32 { 0 } //~ ERROR functions in traits cannot be declared const
+}
+
+trait Bar {}
+
+impl dyn Bar {
+    const fn baz() -> u32 { 0 } // stabilized
+}
+
+static FOO: usize = foo();
+const BAR: usize = foo();
+
+macro_rules! constant {
+    ($n:ident: $t:ty = $v:expr) => {
+        const $n: $t = $v;
+    }
+}
+
+constant! {
+    BAZ: usize = foo()
+}
+
+fn main() {
+    let x: [usize; foo()] = [];
+}