Fix: missing path lookup through alias. Fixes #4645

crystal-lang · Sep 16, 2017 · 5c27083 · 5c27083
1 parent 49f9d28
commit 5c27083
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diff --git a/spec/compiler/semantic/alias_spec.cr b/spec/compiler/semantic/alias_spec.cr
@@ -264,4 +264,28 @@ describe "Semantic: alias" do
       Baz::Bar.baz
       )) { int32 }
   end
+
+  it "finds type through alias (#4645)" do
+    assert_type(%(
+      module FooBar
+        module Foo
+          A = 10
+        end
+
+        module Bar
+          include Foo
+        end
+      end
+
+      class Baz
+        alias Bar = FooBar::Bar
+
+        def test
+          Bar::A
+        end
+      end
+
+      Baz.new.test
+      )) { int32 }
+  end
 end
diff --git a/src/compiler/crystal/semantic/path_lookup.cr b/src/compiler/crystal/semantic/path_lookup.cr
@@ -141,6 +141,16 @@ module Crystal
     end
   end
 
+  class AliasType
+    def lookup_path_item(name : String, lookup_in_namespace, include_private, location)
+      if aliased_type = aliased_type?
+        aliased_type.lookup_path_item(name, lookup_in_namespace, include_private, location)
+      else
+        super
+      end
+    end
+  end
+
   class TypeDefType
     delegate lookup_path, to: typedef
   end