Ben Cohen 345879429b [stdlib] Take several underscored stdlib functions private (#18134) ...

* Make _sanityCheck internal

* Make _debugPrecondition internal

* Make Optional._unsafelyUnwrappedUnchecked internal.

* Make _precondition internal

* Switch Foundation _sanityChecks to assertions

* Update file check tests

* Remove one more _debugPrecondition

* Update Optimization-with-check tests

2018-07-24 18:26:19 -07:00

2.2 KiB

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