Copy docs from enum members to their helper methods (crystal-lang#11333)

spec/compiler/semantic/enum_spec.cr

@@ -613,4 +613,16 @@ describe "Semantic: enum" do
     a_def = result.program.types["Foo"].lookup_defs("foo").first
     a_def.previous.should be_nil
   end
+
+  it "copies docs from member to helper method (#11333)" do
+    result = top_level_semantic <<-CRYSTAL, wants_doc: true
+    enum Foo
+      # These are the docs for `Bar`
+      Bar = 1
+    end
+    CRYSTAL
+
+    a_defs = result.program.types["Foo"].lookup_defs("bar?")
+    a_defs.first.doc.should eq("These are the docs for `Bar`")
+  end
 end

src/compiler/crystal/semantic/top_level_visitor.cr

@@ -824,6 +824,7 @@ class Crystal::TopLevelVisitor < Crystal::SemanticVisitor
     method_name = is_flags ? "includes?" : "=="
     body = Call.new(Var.new("self").at(member), method_name, Path.new(member.name).at(member)).at(member)
     a_def = Def.new("#{member.name.underscore}?", body: body).at(member)
+    a_def.doc = member.doc
     enum_type.add_def a_def
   end