Has anyone written a graphical application in Go on Plan 9? How would the Go equivalent of black.c (thank you fgb) look like?  

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#include <u.h>
#include <libc.h>
#include <draw.h>

void
main(int, char *argv[])
{
	Rectangle	rect;
	Image *black;

	fmtinstall('R', Rfmt);
	if(initdraw(nil, nil, argv[0]) < 0)
		sysfatal("initdraw: %r");
	rect = screen->r;
	black = display->black;
	draw(screen, rect, black, nil, ZP);
	flushimage(display, 1);
	sleep(5 * 1000);
	closedisplay(display);
	print("rectangle was %R\n", rect);
	exits(nil);
}