Fix another issue with getTemplateLocals and block params

packages/@glimmer/syntax/lib/get-template-locals.ts

@@ -43,6 +43,19 @@ function tokensFromType(
       return;
     }
 
+    // the tag may be from a yielded object
+    // example:
+    //   <x.button>
+    // An ElementNode does not parse the "tag" in to a PathExpression
+    // so we have to split on `.`, just like how `this` presence is checked.
+    if (tag.indexOf('.') !== -1) {
+      let [potentialLocal] = tag.split('.');
+
+      if (scopedTokens.indexOf(potentialLocal) !== -1) {
+        return;
+      }
+    }
+
     if (scopedTokens.indexOf(tag) !== -1) {
       return;
     }

packages/@glimmer/syntax/test/template-locals-test.ts

@@ -76,6 +76,34 @@ QUnit.test('it does not include locals', function (assert) {
   assert.deepEqual(locals, ['SomeComponent']);
 });
 
+QUnit.test('it excludes object locals', function (assert) {
+  let locals = getTemplateLocals(
+    `
+      <SomeComponent as |b|>
+        <b.button />
+      </SomeComponent>
+    `
+  );
+
+  assert.deepEqual(locals, ['SomeComponent']);
+});
+
+QUnit.test('it excludes object locals from nested blocks', function (assert) {
+  let locals = getTemplateLocals(
+    `
+      <SomeComponent as |some|>
+        <some.foo as |foo|>
+          <foo.bar as |bar|>
+            <bar.baz />
+          </foo.bar>
+        </some.foo>
+      </SomeComponent>
+    `
+  );
+
+  assert.deepEqual(locals, ['SomeComponent']);
+});
+
 QUnit.test('it can include keywords', function (assert) {
   let locals = getTemplateLocals(
     `