[Issue 11721] New: regression: std.utf.toUTFindex throws error instead of exception

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11721

           Summary: regression: std.utf.toUTFindex throws error instead of
                    exception
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: timothee.cour2 at gmail.com


--- Comment #0 from Timothee Cour <timothee.cour2 at gmail.com> 2013-12-10 17:03:35 PST ---
(this came up in discussion EMAIL:std.utf: use throw UTFException instead of
assert(0) in stride, etc)

063_2: ok
git head/064_2: fails core.exception.AssertError at phobos/std/utf.d(171): Past
the end of the UTF-8 sequence

import std.traits;
inout(C)[] slice(C)(inout(C)[] str, size_t i, size_t j) if(isSomeChar!C) {
  import std.utf;
  immutable first = str.toUTFindex(i);
  immutable second = str[first .. $].toUTFindex(j-i) + first;
  return str[first .. second];
}

unittest{
  auto a = "≈açç√ef";
  import std.exception;  
  import core.exception;  
  assertThrown!Throwable(a.slice(2,8));//ok
  assertThrown!RangeError(a.slice(2,8));//fails
}

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