Add forget_ref tests.

Also rename drop_ref.rs to drop_forget_ref.rs in tests/compile-fail.

Author: theemathas

tests/compile-fail/drop_forget_ref.rs

@@ -0,0 +1,60 @@
+#![feature(plugin)]
+#![plugin(clippy)]
+
+#![deny(drop_ref, forget_ref)]
+#![allow(toplevel_ref_arg, similar_names)]
+
+use std::mem::{drop, forget};
+
+struct SomeStruct;
+
+fn main() {
+ drop(&SomeStruct); //~ERROR call to `std::mem::drop` with a reference argument
+ forget(&SomeStruct); //~ERROR call to `std::mem::forget` with a reference argument
+
+ let mut owned1 = SomeStruct;
+ drop(&owned1); //~ERROR call to `std::mem::drop` with a reference argument
+ drop(&&owned1); //~ERROR call to `std::mem::drop` with a reference argument
+ drop(&mut owned1); //~ERROR call to `std::mem::drop` with a reference argument
+ drop(owned1); //OK
+ let mut owned2 = SomeStruct;
+ forget(&owned2); //~ERROR call to `std::mem::forget` with a reference argument
+ forget(&&owned2); //~ERROR call to `std::mem::forget` with a reference argument
+ forget(&mut owned2); //~ERROR call to `std::mem::forget` with a reference argument
+ forget(owned2); //OK
+
+ let reference1 = &SomeStruct;
+ drop(reference1); //~ERROR call to `std::mem::drop` with a reference argument
+ forget(&*reference1); //~ERROR call to `std::mem::forget` with a reference argument
+
+ let reference2 = &mut SomeStruct;
+ drop(reference2); //~ERROR call to `std::mem::drop` with a reference argument
+ let reference3 = &mut SomeStruct;
+ forget(reference3); //~ERROR call to `std::mem::forget` with a reference argument
+
+ let ref reference4 = SomeStruct;
+ drop(reference4); //~ERROR call to `std::mem::drop` with a reference argument
+ forget(reference4); //~ERROR call to `std::mem::forget` with a reference argument
+}
+
+#[allow(dead_code)]
+fn test_generic_fn_drop<T>(val: T) {
+ drop(&val); //~ERROR call to `std::mem::drop` with a reference argument
+ drop(val); //OK
+}
+
+#[allow(dead_code)]
+fn test_generic_fn_forget<T>(val: T) {
+ forget(&val); //~ERROR call to `std::mem::forget` with a reference argument
+ forget(val); //OK
+}
+
+#[allow(dead_code)]
+fn test_similarly_named_function() {
+ fn drop<T>(_val: T) {}
+ drop(&SomeStruct); //OK; call to unrelated function which happens to have the same name
+ std::mem::drop(&SomeStruct); //~ERROR call to `std::mem::drop` with a reference argument
+ fn forget<T>(_val: T) {}
+ forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
+ std::mem::forget(&SomeStruct); //~ERROR call to `std::mem::forget` with a reference argument
+}