HelenOS sources

ec_unop           396 uspace/app/sbi/src/p_expr.c 		tmp = stree_expr_new(ec_unop);
ec_unop           157 uspace/app/sbi/src/run_expr.c 	case ec_unop:
ec_unop           164 uspace/app/sbi/src/stype_expr.c 	case ec_unop:
HelenOS homepage, sources at GitHub