Time trace: large sections of std.stdio isn't showing up as what it is doing

[rikkimax]

ldc 1.35.0, Windows.

I'm doing a quick look into seeing why std.stdio can appear to be costly to use for writeln.

What I'm interested in is what is happening in sema1 that isn't showing up on the time trace.

Test code:

void main() {
        import std.stdio;
        writeln("Hello!");
}

A quick estimate would suggest around 80ms out of 180ms is unaccounted for in the graph.