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Rollup merge of #95207 - ZHANGWENTAI:update_termination_doc, r=yaahc

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update Termination trait docs

this pr add some statement about intending to provide `Termination` trait only on standard library's runtime.

from #93448

r? `@Lokathor`
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Dylan DPC 2022-03-22 19:07:37 +01:00 • committed by GitHub
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library/std/src/process.rs
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@ -2030,6 +2030,11 @@ pub fn id() -> u32 {
///
/// The default implementations are returning `libc::EXIT_SUCCESS` to indicate
/// a successful execution. In case of a failure, `libc::EXIT_FAILURE` is returned.
///
/// Because different runtimes have different specifications on the return value
/// of the `main` function, this trait is likely to be available only on
/// standard library's runtime for convenience. Other runtimes are not required
/// to provide similar functionality.
#[cfg_attr(not(test), lang = "termination")]
#[unstable(feature = "termination_trait_lib", issue = "43301")]
#[rustc_on_unimplemented(