In plan9port, USED() is defined as
#define USED(x) if(x){}else{}
Does it mean that USED() can only be applied on variables of "scalar
types"? But r is of a struct type in
void
drawresizewindow(Rectangle r)
{
USED(r);
bad();
}
in $PLAN9/src/libdraw/nowsys-wsys.c.
When compiling, 9c complains on that. A bug? Or an extension of Plan 9's
C dialect?
