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termination_trait: Make error message more helpful

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This commit is contained in:
Tyler Mandry 2018-03-21 23:28:48 -05:00
parent b6934c91b2
commit 2b13d95da0
5 changed files with 16 additions and 16 deletions
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5
src/libstd/process.rs
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@ -1442,8 +1442,9 @@ pub fn id() -> u32 {
/// a successful execution. In case of a failure, `libc::EXIT_FAILURE` is returned.
#[cfg_attr(not(test), lang = "termination")]
#[unstable(feature = "termination_trait_lib", issue = "43301")]
#[rustc_on_unimplemented =
"`main` can only return types that implement {Termination}, not `{Self}`"]
#[rustc_on_unimplemented(
message="`main` has invalid return type `{Self}`",
label="`main` can only return types that implement {Termination}")]
pub trait Termination {
/// Is called to get the representation of the value as status code.
/// This status code is returned to the operating system.