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Auto merge of #84401 - crlf0710:impl_main_by_path, r=petrochenkov

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Implement RFC 1260 with feature_name `imported_main`.

This is the second extraction part of #84062 plus additional adjustments.
This (mostly) implements RFC 1260.

However there's still one test case failure in the extern crate case. Maybe `LocalDefId` doesn't work here? I'm not sure.

cc https://github.com/rust-lang/rust/issues/28937
r? `@petrochenkov`
This commit is contained in:
bors 2021-04-30 06:59:37 +00:00
commit bcd696d722
38 changed files with 463 additions and 193 deletions
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3
compiler/rustc_feature/src/active.rs
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@ -653,6 +653,9 @@ declare_features! (
/// Allows unsizing coercions in `const fn`.
(active, const_fn_unsize, "1.53.0", Some(64992), None),
/// Allows using imported `main` function
(active, imported_main, "1.53.0", Some(28937), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------