import std.stdio;

​

/** */

wstring fromWChar( const wchar* s )

{

    import std.conv : to;

    return s[ 0 .. wcslen( s ) ].to!wstring;

}

​

size_t wcslen( const( wchar )* s  )

{

    auto ptr = s;

    for ( ; *ptr != 0; ptr += 1 ) {}

​

    return ptr - s;

}

​

void sayHello( const( wchar ) *s )

{

    auto s2 = fromWChar( s );

    writeln( s2 );

}

​

void main() {

    const( wchar )* s2 = "hello!";

    sayHello( s2 );

}

​