1env GO111MODULE=on
2
3cd $WORK
4
5# An import provided by two different modules should be flagged as an error.
6! go build ./importx
7stderr '^importx[/\\]importx.go:2:8: ambiguous import: found package example.com/a/x in multiple modules:\n\texample.com/a v0.1.0 \('$WORK'[/\\]a[/\\]x\)\n\texample.com/a/x v0.1.0 \('$WORK'[/\\]ax\)$'
8
9# However, it should not be an error if that import is unused.
10go build ./importy
11
12# An import provided by both the main module and the vendor directory
13# should be flagged as an error only when -mod=vendor is set.
14mkdir vendor/example.com/m/importy
15cp $WORK/importy/importy.go vendor/example.com/m/importy/importy.go
16go build example.com/m/importy
17! go build -mod=vendor example.com/m/importy
18stderr '^ambiguous import: found package example.com/m/importy in multiple directories:\n\t'$WORK'[/\\]importy\n\t'$WORK'[/\\]vendor[/\\]example.com[/\\]m[/\\]importy$'
19
20-- $WORK/go.mod --
21module example.com/m
22go 1.13
23require (
24 example.com/a v0.1.0
25 example.com/a/x v0.1.0
26)
27replace (
28 example.com/a v0.1.0 => ./a
29 example.com/a/x v0.1.0 => ./ax
30)
31-- $WORK/importx/importx.go --
32package importx
33import _ "example.com/a/x"
34-- $WORK/importy/importy.go --
35package importy
36import _ "example.com/a/y"
37-- $WORK/a/go.mod --
38module example.com/a
39go 1.14
40-- $WORK/a/x/x.go --
41package x
42-- $WORK/a/y/y.go --
43package y
44-- $WORK/ax/go.mod --
45module example.com/a/x
46go 1.14
47-- $WORK/ax/x.go --
48package x
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