retitle 990406 groff: ".ta T -5" causes troff assertion failure
tag 990406 + upstream
thanks

What's going on is much clearer if groff Git HEAD, thanks to its
improved `assert()` implementation.

$ printf '.ta T -5\n\t' | tg
troff: ../src/roff/troff/env.cpp:2620: distance_to_next_tab(): assertion 
failed: 'lastpos > 0'
.../groff/build/groff: error: troff: Aborted (core dumped)

I'll have a look at this.

Regards,
Branden

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