38cb91e66c
These two attributes are used to change the entry point into a Rust program, but
for now they're being put behind feature gates until we have a chance to think
about them a little more. The #[start] attribute specifically may have its
signature changed.
This is a breaking change to due the usage of these attributes generating errors
by default now. If your crate is using these attributes, add this to your crate
root:
#![feature(start)] // if you're using the #[start] attribute
#![feature(main)] // if you're using the #[main] attribute
cc #20064
52 lines
1.0 KiB
Rust
52 lines
1.0 KiB
Rust
// Copyright 2013 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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#![allow(unused_variables)]
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#![deny(dead_code)]
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#![feature(main, start)]
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struct Foo;
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trait Bar {
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fn bar1(&self);
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fn bar2(&self) {
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self.bar1();
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}
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}
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impl Bar for Foo {
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fn bar1(&self) {
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live_fn();
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}
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}
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fn live_fn() {}
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fn dead_fn() {} //~ ERROR: function is never used
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#[main]
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fn dead_fn2() {} //~ ERROR: function is never used
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fn used_fn() {}
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#[start]
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fn start(_: isize, _: *const *const u8) -> isize {
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used_fn();
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let foo = Foo;
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foo.bar2();
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0
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}
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// this is not main
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fn main() { //~ ERROR: function is never used
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dead_fn();
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dead_fn2();
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}
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