Don't propose 'Assign to local variable' when in arguments list.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//943053005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44036 260f80e4-7a28-3924-810f-c04153c831b5

pkg/analysis_server/lib/src/services/correction/assist_internal.dart

@@ -362,6 +362,11 @@ class AssistProcessor {
     // prepare expression
     Expression expression = expressionStatement.expression;
     int offset = expression.offset;
+    // ignore if in arguments
+    if (node.getAncestor((node) => node is ArgumentList) != null) {
+      _coverageMarker();
+      return;
+    }
     // ignore if already assignment
     if (expression is AssignmentExpression) {
       _coverageMarker();

pkg/analysis_server/test/services/correction/assist_test.dart

@@ -613,6 +613,16 @@ main() {
     assertNoAssistAt('vvv =', AssistKind.ASSIGN_TO_LOCAL_VARIABLE);
   }
 
+  void test_assignToLocalVariable_invocationArgument() {
+    resolveTestUnit(r'''
+main() {
+  f(12345);
+}
+int f(p) {}
+''');
+    assertNoAssistAt('345', AssistKind.ASSIGN_TO_LOCAL_VARIABLE);
+  }
+
   void test_assignToLocalVariable_throw() {
     resolveTestUnit('''
 main() {