1env GO111MODULE=on
2env GOTRACEBACK=single
3
4# Go 1.21 work module should leave panicnil with an implicit default.
5cp go.mod.21 go.mod
6go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
7! stdout panicnil
8stdout randautoseed=0
9
10# Go 1.21 work module should NOT set panicnil=1 in Go 1.20 dependency.
11cp go.mod.21 go.mod
12go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' q
13! stdout panicnil=1
14! stdout randautoseed
15
16go mod download rsc.io/panicnil # for go.sum
17go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' rsc.io/panicnil
18! stdout panicnil=1
19! stdout randautoseed
20
21# Go 1.20 work module should set panicnil=1.
22cp go.mod.20 go.mod
23go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
24stdout panicnil=1
25stdout randautoseed=0
26
27# Go 1.20 work module should set panicnil=1 in Go 1.20 dependency.
28cp go.mod.20 go.mod
29go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' q
30stdout panicnil=1
31! stdout randautoseed
32
33# Go 1.21 workspace should leave panicnil with an implicit default.
34cat q/go.mod
35cp go.work.21 go.work
36go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
37! stdout panicnil
38stdout randautoseed=0
39rm go.work
40
41# Go 1.20 workspace with Go 1.21 module cannot happen.
42cp go.work.20 go.work
43cp go.mod.21 go.mod
44! go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
45stderr 'go: module . listed in go.work file requires go >= 1.21'
46rm go.work
47
48# Go 1.21 go.mod with godebug default=go1.20
49rm go.work
50cp go.mod.21 go.mod
51go mod edit -godebug default=go1.20 -godebug asynctimerchan=0
52go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
53stdout panicnil=1
54stdout asynctimerchan=0
55
56# Go 1.21 go.work with godebug default=go1.20
57cp go.work.21 go.work
58go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
59! stdout panicnil # go.work wins
60stdout asynctimerchan=1 # go.work wins
61go work edit -godebug default=go1.20 -godebug asynctimerchan=0
62go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
63stdout panicnil=1
64stdout asynctimerchan=0
65rm go.work
66
67# Go 1.21 go.mod with //go:debug default=go1.20 in program
68cp go.mod.21 go.mod
69go list -tags godebug -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
70stdout panicnil=1
71stdout asynctimerchan=0
72
73# Invalid //go:debug line should be diagnosed at build.
74! go build -tags godebugbad
75stderr 'invalid //go:debug: value contains space'
76
77[short] skip
78
79# Programs in Go 1.21 work module should trigger run-time error.
80cp go.mod.21 go.mod
81! go run .
82stderr 'panic: panic called with nil argument'
83
84! go run rsc.io/panicnil
85stderr 'panic: panic called with nil argument'
86
87# Programs in Go 1.20 work module use old panic nil behavior.
88cp go.mod.20 go.mod
89! go run .
90stderr 'panic: nil'
91
92! go run rsc.io/panicnil
93stderr 'panic: nil'
94
95# Programs in no module at all should use their go.mod file.
96rm go.mod
97! go run rsc.io/panicnil@v1.0.0
98stderr 'panic: nil'
99
100rm go.mod
101! go run rsc.io/panicnil@v1.1.0
102stderr 'panic: panic called with nil argument'
103
104-- go.work.21 --
105go 1.21
106use .
107use ./q
108
109-- go.work.20 --
110go 1.20
111use .
112use ./q
113
114-- go.mod.21 --
115go 1.21
116module m
117require q v1.0.0
118replace q => ./q
119require rsc.io/panicnil v1.0.0
120
121-- go.mod.20 --
122go 1.20
123module m
124require q v1.0.0
125replace q => ./q
126require rsc.io/panicnil v1.0.0
127
128-- p.go --
129//go:debug randautoseed=0
130
131package main
132
133func main() {
134 panic(nil)
135}
136
137-- godebug.go --
138//go:build godebug
139//go:debug default=go1.20
140//go:debug asynctimerchan=0
141
142package main
143
144-- godebugbad.go --
145//go:build godebugbad
146//go:debug default=go1.20 asynctimerchan=0
147
148package main
149
150-- q/go.mod --
151go 1.20
152module q
153
154-- q/q.go --
155package main
156func main() {}
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