[phobos] [dlang/phobos] 50c660: restore mistakenly removed 'scope'

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/dlang/phobos
  Commit: 50c660f4bb518f381120a5968740e256950ee4d5
      https://github.com/dlang/phobos/commit/50c660f4bb518f381120a5968740e256950ee4d5
  Author: anonymous <aG0aep6G at users.noreply.github.com>
  Date:   2016-07-03 (Sun, 03 Jul 2016)

  Changed paths:
    M std/digest/digest.d

  Log Message:
  -----------
  restore mistakenly removed 'scope'

This reverts a part of commit 77aa18e3e5e3cfa6682d5f8ee961afe70f948d67.


  Commit: 665fffb0fb0d602256992745b52588eedc38882b
      https://github.com/dlang/phobos/commit/665fffb0fb0d602256992745b52588eedc38882b
  Author: Walter Bright <WalterBright at users.noreply.github.com>
  Date:   2016-07-04 (Mon, 04 Jul 2016)

  Changed paths:
    M std/digest/digest.d

  Log Message:
  -----------
  Merge pull request #4552 from aG0aep6G/partly-revert-pr4549

restore mistakenly removed 'scope'


Compare: https://github.com/dlang/phobos/compare/f0634c25bdf9...665fffb0fb0d