smart_resolve_partial_mod_path_errors should not suggest parent

Author: chenyukang

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -350,9 +350,10 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
                 .filter(|candidate| {
                     if let Some(def_id) = candidate.did &&
                         let Some(module) = self.r.get_module(def_id) {
-                            self.r.resolutions(module).borrow().iter().any(|(key, _r)| {
-                                key.ident.name == following_seg.ident.name
-                            })
+                                Some(def_id) != self.parent_scope.module.opt_def_id() &&
+                                self.r.resolutions(module).borrow().iter().any(|(key, _r)| {
+                                    key.ident.name == following_seg.ident.name
+                                })
                     } else {
                         false
                     }

tests/ui/resolve/export-fully-qualified-2018.stderr

@@ -3,11 +3,6 @@ error[E0433]: failed to resolve: use of undeclared crate or module `foo`
    |
 LL |     pub fn bar() { foo::baz(); }
    |                    ^^^ use of undeclared crate or module `foo`
-   |
-help: consider importing this module
-   |
-LL +     use crate::foo;
-   |
 
 error: aborting due to previous error
 

tests/ui/resolve/export-fully-qualified.stderr

@@ -3,11 +3,6 @@ error[E0433]: failed to resolve: use of undeclared crate or module `foo`
    |
 LL |     pub fn bar() { foo::baz(); }
    |                    ^^^ use of undeclared crate or module `foo`
-   |
-help: consider importing this module
-   |
-LL +     use foo;
-   |
 
 error: aborting due to previous error
 

tests/ui/suggestions/crate-or-module-typo.stderr

@@ -36,11 +36,6 @@ error[E0433]: failed to resolve: use of undeclared crate or module `bar`
    |
 LL |     pub fn bar() { bar::baz(); }
    |                    ^^^ use of undeclared crate or module `bar`
-   |
-help: consider importing this module
-   |
-LL +     use crate::bar;
-   |
 
 error: aborting due to 4 previous errors