mirror of https://github.com/rust-lang/rust
132 lines
2.7 KiB
Rust
132 lines
2.7 KiB
Rust
#![allow(dead_code, path_statements)]
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#![deny(unused_attributes, unused_must_use)]
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#![feature(asm_experimental_arch, stmt_expr_attributes, trait_alias)]
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#[must_use] //~ ERROR `#[must_use]` has no effect
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extern crate std as std2;
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#[must_use] //~ ERROR `#[must_use]` has no effect
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mod test_mod {}
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#[must_use] //~ ERROR `#[must_use]` has no effect
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use std::arch::global_asm;
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#[must_use] //~ ERROR `#[must_use]` has no effect
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const CONST: usize = 4;
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#[must_use] //~ ERROR `#[must_use]` has no effect
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#[no_mangle]
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static STATIC: usize = 4;
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#[must_use]
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struct X;
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#[must_use]
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enum Y {
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Z,
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}
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#[must_use]
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union U {
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unit: (),
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}
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#[must_use] //~ ERROR `#[must_use]` has no effect
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impl U {
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#[must_use]
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fn method() -> i32 {
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4
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}
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}
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#[must_use]
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#[no_mangle]
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fn foo() -> i64 {
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4
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}
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#[must_use] //~ ERROR `#[must_use]` has no effect
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extern "Rust" {
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#[link_name = "STATIC"]
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#[must_use] //~ ERROR `#[must_use]` has no effect
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static FOREIGN_STATIC: usize;
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#[link_name = "foo"]
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#[must_use]
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fn foreign_foo() -> i64;
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}
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#[must_use] //~ ERROR unused attribute
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global_asm!("");
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#[must_use] //~ ERROR `#[must_use]` has no effect
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type UseMe = ();
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fn qux<#[must_use] T>(_: T) {} //~ ERROR `#[must_use]` has no effect
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#[must_use]
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trait Use {
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#[must_use] //~ ERROR `#[must_use]` has no effect
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const ASSOC_CONST: usize = 4;
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#[must_use] //~ ERROR `#[must_use]` has no effect
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type AssocTy;
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#[must_use]
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fn get_four(&self) -> usize {
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4
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}
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}
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#[must_use] //~ ERROR `#[must_use]` has no effect
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impl Use for () {
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type AssocTy = ();
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}
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#[must_use] //~ ERROR `#[must_use]` has no effect
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trait Alias = Use;
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#[must_use] //~ ERROR `#[must_use]` has no effect
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macro_rules! cool_macro {
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() => {
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4
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};
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}
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fn main() {
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#[must_use] //~ ERROR `#[must_use]` has no effect
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let x = || {};
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x();
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let x = #[must_use] //~ ERROR `#[must_use]` has no effect
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|| {};
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x();
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X; //~ ERROR that must be used
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Y::Z; //~ ERROR that must be used
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U { unit: () }; //~ ERROR that must be used
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U::method(); //~ ERROR that must be used
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foo(); //~ ERROR that must be used
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unsafe {
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foreign_foo(); //~ ERROR that must be used
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};
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CONST;
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STATIC;
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unsafe { FOREIGN_STATIC };
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cool_macro!();
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qux(4);
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().get_four(); //~ ERROR that must be used
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match Some(4) {
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#[must_use] //~ ERROR `#[must_use]` has no effect
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Some(res) => res,
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None => 0,
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};
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struct PatternField {
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foo: i32,
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}
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let s = PatternField { #[must_use] foo: 123 }; //~ ERROR `#[must_use]` has no effect
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let PatternField { #[must_use] foo } = s; //~ ERROR `#[must_use]` has no effect
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}
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