rust/tests/compile-fail/drop_ref.rs

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#![feature(plugin)]
#![plugin(clippy)]
#![deny(drop_ref)]
#![allow(toplevel_ref_arg)]
use std::mem::drop;
struct DroppableStruct;
impl Drop for DroppableStruct { fn drop(&mut self) {} }
fn main() {
drop(&DroppableStruct); //~ERROR call to `std::mem::drop` with a reference argument
let mut owned = DroppableStruct;
drop(&owned); //~ERROR call to `std::mem::drop` with a reference argument
drop(&&owned); //~ERROR call to `std::mem::drop` with a reference argument
drop(&mut owned); //~ERROR call to `std::mem::drop` with a reference argument
drop(owned); //OK
let reference1 = &DroppableStruct;
drop(reference1); //~ERROR call to `std::mem::drop` with a reference argument
drop(&*reference1); //~ERROR call to `std::mem::drop` with a reference argument
let reference2 = &mut DroppableStruct;
drop(reference2); //~ERROR call to `std::mem::drop` with a reference argument
let ref reference3 = DroppableStruct;
drop(reference3); //~ERROR call to `std::mem::drop` with a reference argument
}
#[allow(dead_code)]
fn test_generic_fn<T>(val: T) {
drop(&val); //~ERROR call to `std::mem::drop` with a reference argument
drop(val); //OK
}
#[allow(dead_code)]
fn test_similarly_named_function() {
fn drop<T>(_val: T) {}
drop(&DroppableStruct); //OK; call to unrelated function which happens to have the same name
std::mem::drop(&DroppableStruct); //~ERROR call to `std::mem::drop` with a reference argument
}