Make "this" the implicit receiver!

test/implicit_receiver/locals_shadow_getter.wren

@@ -0,0 +1,17 @@
+class Foo {
+  bar { return "getter" }
+
+  test {
+    IO.print(bar) // expect: getter
+
+    {
+      IO.print(bar) // expect: getter
+      var bar = "local"
+      IO.print(bar) // expect: local
+    }
+
+    IO.print(bar) // expect: getter
+  }
+}
+
+(new Foo).test