[Issue 18531] New: core.exception.RangeError at src/core/demangle.d(216): Range violation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18531

          Issue ID: 18531
           Summary: core.exception.RangeError at src/core/demangle.d(216):
                    Range violation
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: major
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: timothee.cour2 at gmail.com

different from https://issues.dlang.org/show_bug.cgi?id=18208
```
void main(){
  auto
s=`_D3std3uni__T6toCaseS_DQvQt12toLowerIndexFNaNbNiNewZtVii1043S_DQCjQCi10toLowerTabFNaNbNiNemZwSQDo5ascii7toLowerTAyaZQDzFNaNeQmZ14__foreachbody2MFNaNeKmKwZ14__foreachbody3MFNaNeKwZi`;
  import core.demangle;
  auto dst=new char[200];
  import std.stdio;
  writeln(demangle(s, dst));
}

```

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