1env TESTGO_VERSION=go1.21.0
2env TESTGO_VERSION_SWITCH=switch
3
4# If the main module's go.mod file lists a version lower than the version
5# required by its dependencies, the commands that fetch and diagnose the module
6# graph (such as 'go mod graph' and 'go mod verify') should fail explicitly:
7# they can't interpret the graph themselves, and they aren't allowed to update
8# the go.mod file to record a specific, stable toolchain version that can.
9
10! go mod verify
11stderr '^go: rsc.io/future@v1.0.0: module rsc.io/future@v1.0.0 requires go >= 1.999 \(running go 1.21.0\)'
12
13! go mod graph
14stderr '^go: rsc.io/future@v1.0.0: module rsc.io/future@v1.0.0 requires go >= 1.999 \(running go 1.21.0\)'
15
16# TODO(#64008): 'go mod download' without arguments should fail too.
17
18
19# 'go get' should update the main module's go.mod file to a version compatible with the
20# go version required for rsc.io/future, not fail.
21go get .
22stderr '^go: module rsc.io/future@v1.0.0 requires go >= 1.999; switching to go1.999testmod$'
23stderr '^go: upgraded go 1.21 => 1.999$'
24stderr '^go: added toolchain go1.999testmod$'
25
26
27# Now, the various 'go mod' subcommands should succeed.
28
29go mod download
30
31go mod verify
32
33go mod graph
34
35
36-- go.mod --
37module example
38
39go 1.21
40
41require rsc.io/future v1.0.0
42-- example.go --
43package example
44
45import _ "rsc.io/future"
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