code: public void tinc(String name, int con) throws IOException
      {
          TypeMirror cn = getLocalType(name);
          int index = getLocalVariableIndex(name);
          tinc(cn, index, con);
      }
docs: Increment local variable by constant
  <p>Stack: No change
  @param name local variable name
  @param con signed byte
  @throws IOException
  @see nameArgument
  @see addVariable