[PATCH] D33340: [libcxx] [test] Add string nullptr asserts to erase functions.

[Eric Fiselier via Phabricator via cfe-commits]

EricWF added a comment.

@BillyONeal Changes like this are good for post-commit review (ie just commit it). Adding clearly correct assertions and test cases is never an objectionable thing.


https://reviews.llvm.org/D33340