[phobos] [dlang/phobos] ad99bc: remove unsafe use of .ptr in std.string

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/dlang/phobos
  Commit: ad99bca2f576978e2a78d328ad17a38839a84d01
      https://github.com/dlang/phobos/commit/ad99bca2f576978e2a78d328ad17a38839a84d01
  Author: Walter Bright <walter at walterbright.com>
  Date:   2016-07-24 (Sun, 24 Jul 2016)

  Changed paths:
    M std/string.d

  Log Message:
  -----------
  remove unsafe use of .ptr in std.string


  Commit: 7fde2c6d8ebf0b19d7718ac19138a3a7a69e865e
      https://github.com/dlang/phobos/commit/7fde2c6d8ebf0b19d7718ac19138a3a7a69e865e
  Author: Ilya Yaroshenko <ilyayaroshenko at gmail.com>
  Date:   2016-07-24 (Sun, 24 Jul 2016)

  Changed paths:
    M std/string.d

  Log Message:
  -----------
  Merge pull request #4648 from WalterBright/string-trusted

replace unsafe use of .ptr in std.string


Compare: https://github.com/dlang/phobos/compare/c027225e1480...7fde2c6d8ebf