R2RT aad360eb3d Fix crash with --trace-expand --warn-uninitialized together ...

Some code paths in `ExpandVariablesInString{New,Old}` were not checking
the `filename` parameter for a null pointer, but this can happen when
using the above flags together.  Add the checks and a test case.

Fixes: #17896

2018-04-09 11:59:07 -04:00

7.8 KiB

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