[Issue 18116] New: to!wchar([string, dstring]), and to!char([wstring, dstring]) don't compile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18116

          Issue ID: 18116
           Summary: to!wchar([string, dstring]), and to!char([wstring,
                    dstring]) don't compile
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: dechcaudron+dlang.issue.tracking at protonmail.com

The following should all work:

assert(toImpl!wchar("a") == 'a');
assert(toImpl!char("a"d) == 'a');
assert(toImpl!char("a"w) == 'a');
assert(toImpl!wchar("a"d) == 'a');

I've already coded a solution. Will provide PR.

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