svoid tok_selfType(L<S> tok) {
  int i;
  mainLoop: while ((i = jfind(tok, "selfType", (_tok, nIdx) -> {
    S prev = get(_tok, nIdx-1);
    S next = get(_tok, nIdx+3);
    ret isIdentifier(next)
      || eqOneOf(next, ".", "(")
      || eq(prev, "(") && eq(next, ")")
      || eqOneOf(prev, "instanceof", "cast");
  })) >= 0) {
    // Now find class name by going backwards.
    
    int j = i, level = 1;
    while (j > 0 && level > 0) {
      S t = tok.get(j);
      if (t.equals("}")) ++level;
      if (t.equals("{")) --level;
      j -= 2;
    }
    
    // search for class name
    while (j > 0) {
      S t = tok.get(j);
      if (eqOneOf(t, "class", "interface", "enum") && isIdentifier(get(tok, j+2))) {
        S type = tok_typeArgs_declToInvocation(tok_scanType(tok, j+2));
        
        if (eqGet(tok, i+2, ".") && eqGet(tok, i+4, "class"))
          type = tok_dropTypeParameters(type);
          
        tokSet_reTok(tok, i, type);
        continue mainLoop;
      }
      j -= 2;
    }
    
    tok.set(i, "Object"); // avoid endless loop if no outer class found
  }
}

Began life as a copy of #1023533