[Issue 21233] New: std.conv.parse doesn't report the number of characters consumed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21233

          Issue ID: 21233
           Summary: std.conv.parse doesn't report the number of characters
                    consumed
           Product: D
           Version: D2
          Hardware: x86
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: adela.vais99 at gmail.com

I was working with an input range and I would find it useful to be able to do
something like:

  int ctr = 0;
  val = input.parse!int(ctr);

and then use ctr for location tracking purposes.

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