[Issue 7637] New: writeln doesn't take custom toString into account

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7637

           Summary: writeln doesn't take custom toString into account
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2012-03-03 17:11:49 PST ---
import std.stdio;

struct Foo {
    string toString(bool x) { return ""; }
}

void main()
{
    Foo foo;
    writeln(foo.toString());  // nogo: ok
    writeln(foo);  // compiles
}

The second writeln() call shouldn't compile. It seems writeln uses a default
toString if it doesn't find a toString() function that takes exactly zero
arguments.

Note that it will call the custom toString if 'x' has a default argument.

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