tracer.icn: 7	| tracer(1)
tracer.icn: 16	| tracer suspended 1
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended 2
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended variable = 3
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended variable = "abcdef"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended &subject = "123456"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended &pos = 4
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended &random = 0
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended &trace = -1
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended &subject[3] = "3"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended "4"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended "abcdef"[3] = "c"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended "abcdef"[3+:2] = "cd"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended "0"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended "-"
tracer.icn: 7	| tracer resumed
tracer.icn: 16	| tracer suspended &subject[2] = "2"
tracer.icn: 7	| tracer resumed
tracer.icn: 19	| tracer failed
tracer.icn: 8	| foo(4)
tracer.icn: 22	| foo returned 4
tracer.icn: 8	| foo("123456")
tracer.icn: 22	| foo returned "123456"
tracer.icn: 8	| foo("4")
tracer.icn: 22	| foo returned "4"
tracer.icn: 8	| foo("234")
tracer.icn: 22	| foo returned "234"
tracer.icn: 9	main failed