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Submitted by Travis Reitter

Link to original bug (#623635)

Description

Some languages (like Vala) support native syntax for asynchronous functions.

Vala's GLib/C parser has a heuristic that treats pairs of functions with signatures

void    $(foo)_async (..., GAsyncResultCallback cb, ...);
$(type) $(foo)_finish (..., GAsyncResult *res, ...);

as a native async function returning type $(type).

In order for Vala's (and other languages') GIR parser to generate the same binding, without having to hard-code this heuristic, g-ir-scanner/compiler will need to implement it and adjust GIR output accordingly.