Prompting using stdio

["Nordlöw" via Digitalmars-d-learn]

I thought

int main(string[] args)
{
     import std.stdio;
     write(`Press enter to continue: `);
     stdout.flush;
     auto line = readln();
     writeln("Read ", line);
     return 0;
}

would function as a good prompting but it doesn't.

I outputs the string given to write *after* I've pressed return. 
Why?