[Bug c/89410] [7/8 Regression] ICE 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 #16 from Jonny Grant <jg at jguk dot org> ---
Hello!

Checked 23 Feb trunk
g++ (Compiler-Explorer-Build) 9.0.1 20190223 (experimental)

comment 9 test case
#line 0
does not give an error


Original test case still shows negative line numbers

<source>:-737418241:2: warning: #warning second [-Wcpp]
<source>:-737418240:7: warning: line number out of range

Same for comment 5 test case


Could the "line number out of range" specify what the max line number supported
is perhaps?