1 files changed, 35 insertions, 0 deletions
diff --git a/tests/ui/consts/const-fn-not-safe-for-const.rs b/tests/ui/consts/const-fn-not-safe-for-const.rs
new file mode 100644
index 000000000..b2fe73ae9
--- /dev/null
+++ b/tests/ui/consts/const-fn-not-safe-for-const.rs
@@ -0,0 +1,35 @@
+// Test that we can't call random fns in a const fn or do other bad things.
+
+use std::mem::transmute;
+
+fn random() -> u32 {
+    0
+}
+
+const fn sub(x: &u32) -> usize {
+    unsafe { transmute(x) }
+}
+
+const fn sub1() -> u32 {
+    random() //~ ERROR E0015
+}
+
+static Y: u32 = 0;
+
+const fn get_Y() -> u32 {
+    Y
+    //~^ ERROR E0013
+}
+
+const fn get_Y_addr() -> &'static u32 {
+    &Y
+    //~^ ERROR E0013
+}
+
+const fn get() -> u32 {
+    let x = 22;
+    let y = 44;
+    x + y
+}
+
+fn main() {}