Edinburgh IMP77 Compiler - Version 8.4
    1 %begin
		.Ltext0:
				.align	2
				.global	main
		main:
		.LFB185:
		.LVL0:
				stp	x29, x30, [sp, -16]!
				add	x29, sp, 0
    2 %owninteger nextsym=4
				bl	_imp_initialise
		.LVL1:
		.LDL1:
		.LDL2:
		.LDL3:
		.LBB15:
		.LBB16:
				mov	w0, 0
				bl	exit
		.LVL2:
		.LBE16:
		.LBE15:
		.LFE185:
		.Letext0:
    3 %integer opd
    4 opd=23
    5 %unless 20<=opd<=nextsym+20 %then printstring(" bug1
    6 ")
    7 %if 20<=opd<=nextsym+20 %then opd=opd %else printstring(" bug2
    8 ")
    9 %unless opd>=20  %and opd<=nextsym+20 %then printstring(" bug3
   10 ")
   11
   12 %endofprogram
    8 Statements compiled