rustc_resolve: allow only core, std, meta and --extern in Rust 2018 paths.#54116

Merged

bors merged 7 commits intorust-lang:masterfrom

eddyb:extern-prelude

Sep 15, 2018

Commits on Sep 15, 2018

rustc: support extern crates loaded after query engine creation.
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rustc: add unstable support for --extern crate_name without a path.
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rustc_resolve: don't allow `::crate_name` to bypass `extern_prelude`.
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rustc_resolve: always include core, std and meta in the extern prelude.
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rustc_resolve: use `continue` instead of `return` to "exit" a loop iteration.
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Update submodules to include rust-lang-nursery/rust-clippy#3189 and rust-lang-nursery/rls#1054.
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Revert "Auto merge of #53527 - Emerentius:test_all, r=nrc"
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