bjoernager/rust
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termination_trait: Add () example to error message

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This commit is contained in:
Tyler Mandry 2018-03-20 23:01:42 -05:00
parent 1937661961
commit 94bdeb64f9
3 changed files with 3 additions and 3 deletions
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2
src/libstd/process.rs
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@ -1443,7 +1443,7 @@ pub fn id() -> u32 {
#[cfg_attr(not(test), lang = "termination")] #[cfg_attr(not(test), lang = "termination")]
#[unstable(feature = "termination_trait_lib", issue = "43301")] #[unstable(feature = "termination_trait_lib", issue = "43301")]
#[rustc_on_unimplemented = #[rustc_on_unimplemented =
"`main` can only return types that implement {Termination}, not `{Self}`"] "`main` can only return types like `()` that implement {Termination}, not `{Self}`"]
pub trait Termination { pub trait Termination {
/// Is called to get the representation of the value as status code. /// Is called to get the representation of the value as status code.
/// This status code is returned to the operating system. /// This status code is returned to the operating system.

2
src/test/compile-fail/rfc-1937-termination-trait/termination-trait-main-i32.rs
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@ -8,7 +8,7 @@
// option. This file may not be copied, modified, or distributed // option. This file may not be copied, modified, or distributed
// except according to those terms. // except according to those terms.
// error-pattern:`main` can only return types that implement std::process::Termination, not `i32` // error-pattern:`main` can only return types like `()` that implement std::process::Termination, no
fn main() -> i32 { fn main() -> i32 {
0 0
} }

2
src/test/ui/rfc-1937-termination-trait/termination-trait-main-wrong-type.stderr
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@ -2,7 +2,7 @@ error[E0277]: the trait bound `char: std::process::Termination` is not satisfied
--> $DIR/termination-trait-main-wrong-type.rs:11:14 --> $DIR/termination-trait-main-wrong-type.rs:11:14
| |
LL | fn main() -> char { //~ ERROR LL | fn main() -> char { //~ ERROR
| ^^^^ `main` can only return types that implement std::process::Termination, not `char` | ^^^^ `main` can only return types like `()` that implement std::process::Termination, not `char`
| |
= help: the trait `std::process::Termination` is not implemented for `char` = help: the trait `std::process::Termination` is not implemented for `char`