rust/src/test/compile-fail/lint-unused-unsafe.rs

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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Exercise the unused_unsafe attribute in some positive and negative cases
#[deny(unused_unsafe)];
mod foo {
pub extern {
pub fn bar();
}
}
fn callback<T>(_f: &fn() -> T) -> T { fail!() }
unsafe fn unsf() {}
fn bad1() { unsafe {} } //~ ERROR: unnecessary `unsafe` block
fn bad2() { unsafe { bad1() } } //~ ERROR: unnecessary `unsafe` block
unsafe fn bad3() { unsafe {} } //~ ERROR: unnecessary `unsafe` block
fn bad4() { unsafe { do callback {} } } //~ ERROR: unnecessary `unsafe` block
unsafe fn bad5() { unsafe { unsf() } } //~ ERROR: unnecessary `unsafe` block
fn bad6() {
unsafe { //~ ERROR: unnecessary `unsafe` block
unsafe { // don't put the warning here
unsf()
}
}
}
unsafe fn bad7() {
unsafe { //~ ERROR: unnecessary `unsafe` block
unsafe { //~ ERROR: unnecessary `unsafe` block
unsf()
}
}
}
unsafe fn good0() { unsf() }
fn good1() { unsafe { unsf() } }
fn good2() {
/* bug uncovered when implementing warning about unused unsafe blocks. Be
sure that when purity is inherited that the source of the unsafe-ness
is tracked correctly */
unsafe {
unsafe fn what() -> ~[~str] { fail!() }
do callback {
what();
}
}
}
unsafe fn good3() { foo::bar() }
fn good4() { unsafe { foo::bar() } }
#[allow(unused_unsafe)] fn allowed() { unsafe {} }
fn main() {}