move synthetic fasta closers into the token stream

pkg/front_end/test/scanner_test.dart

Index: pkg/front_end/test/scanner_test.dart
diff --git a/pkg/front_end/test/scanner_test.dart b/pkg/front_end/test/scanner_test.dart
index b1bcdb290b86f9773c875f9cde38b646f9f99f65..2418fc2a691b2bdf48cf1247367c8f0a723aa24d 100644
--- a/pkg/front_end/test/scanner_test.dart
+++ b/pkg/front_end/test/scanner_test.dart
@@ -817,10 +817,6 @@ abstract class ScannerTestBase {
     _assertToken(TokenType.OPEN_SQUARE_BRACKET, "[");
   }
 
-  void test_openSquareBracket() {
-    _assertToken(TokenType.OPEN_SQUARE_BRACKET, "[");
-  }
-
   void test_percent() {
     _assertToken(TokenType.PERCENT, "%");
   }
@@ -1364,7 +1360,9 @@ abstract class ScannerTestBase {
     expect(tokenWithSpaces.offset, 1);
     expect(tokenWithSpaces.length, source.length);
     expect(tokenWithSpaces.lexeme, source);
-    expect(originalToken.next.type, TokenType.EOF);
+
+    // Fasta inserts missing closers (']', '}', ')')
+    //expect(originalToken.next.type, TokenType.EOF);
     return originalToken;
   }