[Bug libfortran/81984] NULL string pointer dereferencing forces undefined behaviour in libgfortran

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81984

--- Comment #4 from Vittorio Zecca <zeccav at gmail dot com> ---
There is no core dump because by default the ubsan sanitizer does not abort.

But I am pretty sure len1==0 at that point.