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8e7795415a
resolve: Split extern prelude into two scopes One scope for `extern crate` items and another for `--extern` options, with the former shadowing the latter. If in a single scope some things can overwrite other things, especially with ad hoc restrictions like `MacroExpandedExternCrateCannotShadowExternArguments`, then it's not really a single scope. So this PR splits `Scope::ExternPrelude` into two cleaner scopes. This is similar to how https://github.com/rust-lang/rust/pull/144131 splits module scope into two scopes for globs and non-globs, but simpler.