Tuomas Tynkkynen af86132e1a libexpr: Make unsafeGetAttrPos not crash on noPos ...

Currently e.g. `builtins.unsafeGetAttrPos "abort" builtins` will
eventually segfault because pos->file is an unset Symbol.

Found by afl-fuzz.

2018-04-03 15:54:42 +03:00

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