[Issue 19091] __traits(compiles) and error in templated structs leads to missing symbol

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19091

--- Comment #13 from FeepingCreature <default_357-line at yahoo.de> ---
Oh yeah, the missing printf I forgot to paste:

[] error: __error

Ie. considering

printf("[%s] %s: %s\n", e.loc.toChars(), EXPtoString(e.op).ptr, e.toChars());

meaning e, probably the opEquals, was in an errored state and we never reported
the error and tried to emit it regardless.

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