71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::mem;
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unsafe fn foo() -> (isize, *const (), Option<fn()>) {
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let i = mem::transmute(bar);
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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let p = mem::transmute(foo);
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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let of = mem::transmute(main);
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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(i, p, of)
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}
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unsafe fn bar() {
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// Error as usual if the resulting type is not pointer-sized.
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mem::transmute::<_, u8>(main);
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//~^ ERROR transmute called with differently sized types
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//~^^ NOTE transmuting between 0 bits and 8 bits
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mem::transmute::<_, *mut ()>(foo);
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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mem::transmute::<_, fn()>(bar);
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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// No error if a coercion would otherwise occur.
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mem::transmute::<fn(), usize>(main);
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}
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unsafe fn baz() {
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mem::transmute::<_, *mut ()>(Some(foo));
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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mem::transmute::<_, fn()>(Some(bar));
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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mem::transmute::<_, Option<fn()>>(Some(baz));
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//~^ ERROR is zero-sized and can't be transmuted
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//~^^ NOTE cast with `as` to a pointer instead
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// No error if a coercion would otherwise occur.
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mem::transmute::<Option<fn()>, usize>(Some(main));
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}
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fn main() {
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unsafe {
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foo();
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bar();
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baz();
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}
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}
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