src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java

@@ -204,12 +204,10 @@
         char saveCh;
         int savePos;
         do {
             if (reader.ch != '_') {
                 reader.putChar(false);
-            } else {
-                checkSourceLevel(pos, Feature.UNDERSCORES_IN_LITERALS);
             }
             saveCh = reader.ch;
             savePos = reader.bp;
             reader.scanChar();
         } while (reader.digit(pos, digitRadix) >= 0 || reader.ch == '_');

@@ -516,11 +514,10 @@
                     if (reader.ch == 'x' || reader.ch == 'X') {
                         reader.scanChar();
                         skipIllegalUnderscores();
                         scanNumber(pos, 16);
                     } else if (reader.ch == 'b' || reader.ch == 'B') {
-                        checkSourceLevel(pos, Feature.BINARY_LITERALS);
                         reader.scanChar();
                         skipIllegalUnderscores();
                         scanNumber(pos, 2);
                     } else {
                         reader.putChar('0');