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* Improve undefined variable error messagesMáté Kocsis2020-03-311-1/+1
| | | | Closes GH-5312
* Convert some notices to warningsNikita Popov2019-10-021-1/+1
| | | | Part of https://wiki.php.net/rfc/engine_warnings.
* Inference: Fix undef handling for binary opsNikita Popov2016-05-141-0/+17
We need to be careful about correctly handling that undef results in a null value. Otherwise, apart from simply generating incorrect results, we may also end up performing non-monotonic lattice transitions, thus causing an infinite type inference loop (see test).