Function letdef2

static/editor.md/lib/codemirror/mode/rust/rust.js:261–264

(type)

    return pass(pattern, maybetype, letdef1);
  }
  function letdef2(type) {
    if (type.match(/[\]\)\};,]/)) return pass(letdef1);
    else return pass(expression, letdef2);
  }
  function maybetype(type) {
    if (type == ":") return cont(typecx, rtype, valcx);
    return pass();