mirror of https://github.com/rust-lang/rust
42 lines
1.5 KiB
Rust
42 lines
1.5 KiB
Rust
fn fn_once() -> _ {
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//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types [E0121]
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//~| NOTE not allowed in type signatures
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//~| HELP replace with an appropriate return type
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//~| SUGGESTION impl FnOnce()
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//~| NOTE for more information on `Fn` traits and closure types
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let x = String::new();
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|| {
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drop(x);
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}
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}
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fn fn_mut() -> _ {
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//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types [E0121]
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//~| NOTE not allowed in type signatures
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//~| HELP replace with an appropriate return type
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//~| SUGGESTION impl FnMut(char)
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//~| NOTE for more information on `Fn` traits and closure types
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let x = String::new();
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//~^ HELP: consider changing this to be mutable
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//~| NOTE binding `x` declared here
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|c| { //~ NOTE: value captured here
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x.push(c);
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//~^ ERROR: does not live long enough
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//~| NOTE: does not live long enough
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//~| NOTE: cannot borrow as mutable
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//~| ERROR: not declared as mutable
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}
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} //~ NOTE: borrow later used here
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//~^ NOTE: dropped here
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fn fun() -> _ {
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//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types [E0121]
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//~| NOTE not allowed in type signatures
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//~| HELP replace with an appropriate return type
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//~| SUGGESTION impl Fn() -> i32
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//~| NOTE for more information on `Fn` traits and closure types
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|| 1i32
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}
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fn main() {}
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