[Issue 16628] New: Special case std.algorithm.equal for known empty or infinite ranges

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16628

          Issue ID: 16628
           Summary: Special case std.algorithm.equal for known empty or
                    infinite ranges
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: nick at geany.org

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

PR pending.

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