[Issue 13717] New: `split` no longer defined by std.string

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13717

          Issue ID: 13717
           Summary: `split` no longer defined by std.string
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: Phobos
          Assignee: nobody at puremagic.com
          Reporter: hsteoh at quickfur.ath.cx

Just filing this so that we don't inadvertently release with a regression.

This problem is caused by the import cleanups in
https://github.com/D-Programming-Language/phobos/pull/2675 , specifically,
commit ab83cd94dac799e9f88b4750004bc8995ff93d46.

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