[phobos] [dlang/phobos] 2be035: fix some unsafe behavior in std.format

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/dlang/phobos
  Commit: 2be035584f31131ebd3e2123b19f457c326d070d
      https://github.com/dlang/phobos/commit/2be035584f31131ebd3e2123b19f457c326d070d
  Author: Walter Bright <walter at walterbright.com>
  Date:   2016-06-14 (Tue, 14 Jun 2016)

  Changed paths:
    M std/format.d

  Log Message:
  -----------
  fix some unsafe behavior in std.format


  Commit: beaa4cdfe033bc42bb2345917a37260fb20474c8
      https://github.com/dlang/phobos/commit/beaa4cdfe033bc42bb2345917a37260fb20474c8
  Author: Steven Schveighoffer <schveiguy at yahoo.com>
  Date:   2016-06-14 (Tue, 14 Jun 2016)

  Changed paths:
    M std/format.d

  Log Message:
  -----------
  Merge pull request #4427 from WalterBright/formatPtrDiff

fix some unsafe behavior in std.format


Compare: https://github.com/dlang/phobos/compare/016b6d7cccca...beaa4cdfe033