rhino drops a character on single line comments

[kingthorin]

Rhino 1.8.0 (I haven't checked older versions)

PoC:

    public static void main(String[] args) {
        try {
            CompilerEnvirons env = new CompilerEnvirons();
            env.setRecordingComments(true);
            Parser parser = new Parser(env, env.getErrorReporter());
            String comment = "// comment";
            System.out.println(comment);
            AstRoot ast = parser.parse(comment, null, 1);
            System.out.println(comment.length());
            System.out.println(ast.debugPrint());
            ast.getComments().forEach(comm -> System.out.println(comm.getValue()));
        } catch (EvaluatorException ee) {
                // nothing to do
        }
    }

Output:

// comment
10
0	SCRIPT 0 9
0	  COMMENT 0 9
0	  COMMENT 0 9

// commen