http://d.puremagic.com/issues/show_bug.cgi?id=5843

           Summary: Unable to format (writeln) a struct with an alias-this
                    to long/ulong.
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nob...@puremagic.com
        ReportedBy: kenn...@gmail.com


--- Comment #0 from kenn...@gmail.com 2011-04-13 09:03:00 PDT ---
Test case:

-----
import std.stdio;

struct S {
    ulong a;
    alias a this;
}

void main() {
    writeln(S.init);
}
-----

As of 2.052, this code generates compile-time error with


/usr/include/phobos/std/conv.d(99): Error: template std.conv.toImpl(T,S) if
(!implicitlyConverts!(S,T) && isSomeString!(T) && isInputRange!(Unqual!(S)) &&
isSomeChar!(ElementType!(S))) does not match any function template declaration
/usr/include/phobos/std/conv.d(99): Error: template std.conv.toImpl(T,S) if
(!implicitlyConverts!(S,T) && isSomeString!(T) && isInputRange!(Unqual!(S)) &&
isSomeChar!(ElementType!(S))) cannot deduce template function from argument
types !(int)(S)
/usr/include/phobos/std/conv.d(99): Error: template instance errors
instantiating template
/usr/include/phobos/std/format.d(1630): Error: template instance
std.conv.to!(int).to!(S) error instantiating
/usr/include/phobos/std/format.d(335):        instantiated from here:
getNthInt!(S)
/usr/include/phobos/std/stdio.d(660):        instantiated from here:
formattedWrite!(LockingTextWriter,immutable(char),S)
/usr/include/phobos/std/stdio.d(1493):        instantiated from here:
write!(S,char)
x.d(9):        instantiated from here: writeln!(S)
/usr/include/phobos/std/format.d(335): Error: template instance
std.format.getNthInt!(S) error instantiating
/usr/include/phobos/std/stdio.d(660):        instantiated from here:
formattedWrite!(LockingTextWriter,immutable(char),S)
/usr/include/phobos/std/stdio.d(1493):        instantiated from here:
write!(S,char)
x.d(9):        instantiated from here: writeln!(S)

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