Reexpose stability hole in the presence of feature gates

src/libsyntax/feature_gate.rs

@@ -225,7 +225,7 @@ pub fn walk_feature_fields<F>(&self, mut f: F)
     (active, const_compare_raw_pointers, "1.27.0", Some(53020), None),
 
     // Allows panicking during const eval (produces compile-time errors)
-    (active, const_panic, "1.29.0", Some(51999), None),
+    (active, const_panic, "1.30.0", Some(51999), None),
 
     // Allows using #[prelude_import] on glob `use` items.
     //

src/test/ui/const-eval/const_panic_libcore_main.rs → src/test/ui/consts/const-eval/const_panic_libcore_main.rs

@@ -28,6 +28,8 @@
 
 #[lang = "eh_personality"]
 fn eh() {}
+#[lang = "eh_unwind_resume"]
+fn eh_unwind_resume() {}
 
 #[panic_implementation]
 fn panic(_info: &PanicInfo) -> ! {