[phobos] [dlang/phobos] 2a45a1: Fix Issue 16628 - std.algorithm.equal for known em...

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/dlang/phobos
  Commit: 2a45a145e8d29bf0f4a12c8fc8296041e475ea60
      https://github.com/dlang/phobos/commit/2a45a145e8d29bf0f4a12c8fc8296041e475ea60
  Author: Nick Treleaven <n at trelsoft.com>
  Date:   2016-10-20 (Thu, 20 Oct 2016)

  Changed paths:
    M std/algorithm/comparison.d

  Log Message:
  -----------
  Fix Issue 16628 - std.algorithm.equal for known empty or infinite ranges

* If one of the ranges has `Range.empty == true`, we can define `equal`
  even when each `front` is not comparable.
* If one range is infinite and the other defines `length`, return false.
* If both are infinite, cause a compile-time error.


  Commit: 52a381320f35f14c26970e9b5842dbe5d429c3c6
      https://github.com/dlang/phobos/commit/52a381320f35f14c26970e9b5842dbe5d429c3c6
  Author: Nick Treleaven <n at trelsoft.com>
  Date:   2016-10-22 (Sat, 22 Oct 2016)

  Changed paths:
    M std/algorithm/comparison.d

  Log Message:
  -----------
  Disallow known empty ranges to be compared against a range with incompatible front


  Commit: 31dad0c099f33b5c584d24ed739e8e5785b71426
      https://github.com/dlang/phobos/commit/31dad0c099f33b5c584d24ed739e8e5785b71426
  Author: Jonathan M Davis <jmdavis at users.noreply.github.com>
  Date:   2016-10-30 (Sun, 30 Oct 2016)

  Changed paths:
    M std/algorithm/comparison.d

  Log Message:
  -----------
  Merge pull request #4871 from ntrel/equal-empty-enum

Fix Issue 16628 - std.algorithm.equal for known empty or infinite ranges


Compare: https://github.com/dlang/phobos/compare/8e10b4b0f115...31dad0c099f3