FIXME: it should be possible to fetch more frames for an arbitrary thread, without making it current.

Finds the immediate child of a `parent` item whose data with role `role` has value `value` */

Returns the first valid item in the range [pos, end), or -1

Try to invoke a method on val, args are passed in as an expression string

which languages might be imported in this context */

* @brief Retrieve this visitor's last encountered declaration. May be null. */

Call this destructive function once, because it transitions this object into an undefined state.

Go to the next node, see iterator::operator++().

* @return The parent item of this one, if there is one. */

parse a UI program