Function struct

MathBox/mathbox-core.js:33390–33395

(allow_assign, allow_comma)

  }

  function struct(allow_assign, allow_comma) {
    var _ = mknode(STRUCT, token, node)
    _.allow_assign = allow_assign === undefined ? true : allow_assign
    _.allow_comma = allow_comma === undefined ? true : allow_comma
    return _
  }

  function expr() {
    var n = mknode(EXPR, token, node)