[Bug c/89410] internal compiler error: in calculate_line_spans, at diagnostic-show-locus.c:1237 after #line

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89410

--- Comment #1 from Jonny Grant <jg at jguk dot org> ---
This was brought up by Martin Sebor on gcc-help BTW.
https://gcc.gnu.org/ml/gcc-help/2019-02/msg00084.html