typ := new(FuncType)
	typ.pos = p.pos()

	var tparamList []*Field
	if p.got(_Lbrack) {
		if context != "" {
			// accept but complain
			p.syntaxErrorAt(typ.pos, context+" must have no type parameters")
		}
		if p.tok == _Rbrack {
			p.syntaxError("empty type parameter list")
			p.next()
		} else {
			tparamList = p.paramList(nil, nil, _Rbrack, true)
		}
	}

	p.want(_Lparen)