add another test for promoteds-in-static

Author: RalfJung

tests/ui/consts/static-promoted-to-mutable-static.rs

@@ -0,0 +1,28 @@
+// check-pass
+#![allow(non_camel_case_types, non_upper_case_globals, static_mut_ref)]
+
+pub struct wl_interface {
+    pub version: i32
+}
+
+pub struct Interface {
+    pub other_interfaces: &'static [&'static Interface],
+    pub c_ptr: Option<&'static wl_interface>,
+}
+
+pub static mut wl_callback_interface: wl_interface = wl_interface {
+    version: 0,
+};
+
+pub static WL_CALLBACK_INTERFACE: Interface = Interface {
+    other_interfaces: &[],
+    c_ptr: Some(unsafe { &wl_callback_interface }),
+};
+
+// This static contains a promoted that points to a static that points to a mutable static.
+pub static WL_SURFACE_INTERFACE: Interface = Interface {
+    other_interfaces: &[&WL_CALLBACK_INTERFACE],
+    c_ptr: None,
+};
+
+fn main() {}