> The problem is that linemap_location_from_macro_expansion_p will
> always return true if locus has discriminator. And in linemap_lookup,
> this will lead to call linemap_macro_map_lookup, in which there is an
> assertion:
>
> linemap_assert (line >= LINEMAPS_MACRO_LOWEST_LOCATION (set));
>
> However, line is actually not a macro location.
That sounds like we're leaking a discriminator location into the
linemap code. Before you can call
linemap_location_from_macro_expansion_p, you need to do this (as in
expand_location_1):
/* If LOC describes a location with a discriminator, extract the
discriminator and map it to the real location. */
if (min_discriminator_location != UNKNOWN_LOCATION
&& loc >= min_discriminator_location
&& loc < next_discriminator_location)
loc = map_discriminator_location (loc);
-cary
