code: public static Object x(final Object x, final String expression) throws CompilationFailedException {
          return me("x", x, expression);
      }
docs: Evaluates the specified String expression and makes the parameter available inside
  the script bound to a variable named 'x', returning the result. For example, this
  code executes without failure:
  <pre>
  assert 10 == Eval.x(2, ' x * 4 + 2')
  </pre>
  @param expression the Groovy expression to evaluate
  @return the result of the expression
  @throws CompilationFailedException if expression is not valid Groovy