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avoid looking twice into external prelude crates

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This commit is contained in:
Douglas Campos 2018-08-10 16:22:46 +00:00
parent 6b9b750f0a
commit 2b3e492194
1 changed files with 8 additions and 1 deletions
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9
src/librustc_resolve/lib.rs
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@ -4302,7 +4302,14 @@ impl<'a, 'crateloader: 'a> Resolver<'a, 'crateloader> {
let mut path_segments = path_segments.clone();
path_segments.push(ast::PathSegment::from_ident(ident));
if !in_module_is_extern || name_binding.vis == ty::Visibility::Public {
let is_extern_crate_that_also_appears_in_prelude =
name_binding.is_extern_crate() &&
self.extern_prelude.contains(&ident.name);
let is_visible_to_user =
!in_module_is_extern || name_binding.vis == ty::Visibility::Public;
if !is_extern_crate_that_also_appears_in_prelude || is_visible_to_user {
// add the module to the lookup
let is_extern = in_module_is_extern || name_binding.is_extern_crate();
if seen_modules.insert(module.def_id().unwrap()) {