Overload resolution for string

[Ali Çehreli]

My previous question was in the context of overloading opEquals. Here it 
is again in a simpler form.

void foo(const(char)[] s)
{}

void foo(const(wchar)[] s)
{}

void foo(const(dchar)[] s)
{}

void main()
{
     foo("hello");
}


Compilation error:

deneme.d(10024): Error: function deneme.foo called with argument types:
	((string))
matches both:
	deneme.foo(const(char)[] s)
and:
	deneme.foo(const(dchar)[] s)


Adding overloads for string, wstring, and dstring does not help. Same 
problem...

Replacing "hello" with either of "hello"c, "hello"w, or "hello"d fixes 
the issue.

This is a bug, right? I've been assuming that unqualified string 
literals were immutable char arrays, but the behavior is different 
between "hello" vs. "hello"c.

Am I missing something?

Thank you,
Ali