[Issue 21358] New: conv.to array to string seems to lack nothrow

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21358

          Issue ID: 21358
           Summary: conv.to array to string seems to lack nothrow
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: andrej.mitrovich at gmail.com

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import std.algorithm;
import std.conv;
import std.range;
import std.stdio;

void main () nothrow
{
    int[] arr;
    auto str1 = "[" ~ arr.map!(elem => elem.to!string).join(",") ~ "]";  // ok
    auto str2 = arr.to!string;  // not nothrow ?
}
-----

I don't quite understand why `to!string` would fail for arrays. Does it throw
exceptions on OOM conditions? But if that's the case it should throw an Error,
not an Exception.

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