[Issue 22826] [REG 2.098] #line accepts importC linemarker flags

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22826

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
This PR introduced the accepts-invalid https://github.com/dlang/dmd/pull/12637

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