Fix cpp20 source location test failure resulting from newer compiler #1326
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What's this all about?
Fix a test case failure caused by changing compiler behavior in a newer compiler version. The signature that MSVC provides for source_location has changed recently.
Instead of chasing the full decorated name, with each compiler having a slight variation, we now match just the meaningful substring that we care about "FailOnLine15". This should now be stable across compilers and across compiler versions.
Fixes: #1325