[phobos] [D-Programming-Language/phobos] 302323: Revert "not really pure"

[noreply at github.com]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/phobos

  Commit: 302323559a382f1c39601ab94888d00c82cd35be
      https://github.com/D-Programming-Language/phobos/commit/302323559a382f1c39601ab94888d00c82cd35be
  Author: jmdavis <jmdavisProg at gmx.com>
  Date:   2011-07-07 (Thu, 07 Jul 2011)

  Changed paths:
    M std/bigint.d
  M std/complex.d
  M std/datetime.d
  M std/internal/math/biguintcore.d
  M std/parallelism.d

  Log Message:
  -----------
  Revert "not really pure"

This reverts commit 4f28db6ffb63f85e2aa22892c4cdaa69129a3dc9.

Since Walter put weakly pure back in, these changes need to be undone.

Conflicts:

	std/datetime.d