Skip macro scopes in ShadowingOuterLocalVar

spec/ameba/rule/lint/shadowing_outer_local_var_spec.cr

@@ -235,6 +235,23 @@ module Ameba::Rule::Lint
           end
           CRYSTAL
       end
+
+      # https://github.com/crystal-ameba/ameba/issues/224#issuecomment-822245167
+      it "does not report scoped vars to MacroFor (2)" do
+        expect_no_issues subject, <<-CRYSTAL
+          struct Test
+            def test
+              {% begin %}
+                {% for ivar in @type.instance_vars %}
+                  {% var_type = ivar %}
+                {% end %}
+
+                {% ["a", "b"].map { |ivar| puts ivar } %}
+              {% end %}
+            end
+          end
+          CRYSTAL
+      end
     end
   end
 end

src/ameba/rule/lint/shadowing_outer_local_var.cr

@@ -39,7 +39,10 @@ module Ameba::Rule::Lint
     MSG = "Shadowing outer local variable `%s`"
 
     def test(source)
-      AST::ScopeVisitor.new self, source
+      AST::ScopeVisitor.new self, source, skip: [
+        Crystal::Macro,
+        Crystal::MacroFor,
+      ]
     end
 
     def test(source, node : Crystal::ProcLiteral, scope : AST::Scope)
@@ -51,9 +54,7 @@ module Ameba::Rule::Lint
     end
 
     private def find_shadowing(source, scope)
-      outer_scope = scope.outer_scope
+      return unless outer_scope = scope.outer_scope
-
-      return if outer_scope.nil? || outer_scope.in_macro?
 
       scope.arguments.reject(&.ignored?).each do |arg|
         variable = outer_scope.find_variable(arg.name)