t.Logf(string(out))
			t.Fatalf("bad trace output line, wanted %d fields got %d: %s",
				wantFields, len(fields), line)
		}
		vname := fields[1]
		frameoff := fields[3]
		varsAtFrameOffset[frameoff] = varsAtFrameOffset[frameoff] + 1
		vars[vname] = frameoff
	}
	wantvnum := 8
	gotvnum := len(vars)
	if wantvnum != gotvnum {
		t.Logf(string(out))