Handle type declarations in scopes

closes #66

spec/ameba/rule/lint/shadowing_local_outer_var_spec.cr

@@ -124,6 +124,20 @@ module Ameba::Rule::Lint
       subject.catch(source).should be_valid
     end
 
+    it "doesn't report if it shadows record type declaration" do
+      source = Source.new %(
+        class FooBar
+          record Foo, index : String
+
+          def bar
+            3.times do |index|
+            end
+          end
+        end
+      )
+      subject.catch(source).should be_valid
+    end
+
     it "reports rule, location and message" do
       source = Source.new %(
         foo = 1

spec/ameba/rule/lint/useless_assign_spec.cr

@@ -408,6 +408,17 @@ module Ameba::Rule::Lint
         )
         subject.catch(s).should be_valid
       end
+
+      it "doesn't report if assignment initialized and captured by block" do
+        s = Source.new %(
+          a : String? = nil
+
+          1.times do
+            a = "Fotis"
+          end
+        )
+        subject.catch(s).should be_valid
+      end
     end
 
     context "branching" do

src/ameba/ast/visitors/scope_visitor.cr

@@ -110,6 +110,13 @@ module Ameba::AST
       on_scope_end(node) if @current_scope.eql?(node)
     end
 
+    # :nodoc:
+    def visit(node : Crystal::TypeDeclaration)
+      if !@current_scope.type_definition? && (var = node.var).is_a?(Crystal::Var)
+        @current_scope.add_variable var
+      end
+    end
+
     # :nodoc:
     def visit(node : Crystal::Arg)
       @current_scope.add_argument node