1# Regression test for https://go.dev/issue/56494:
2# 'go get' in module mode was failing to prune out dependencies
3# through modules whose versions are too low to be selected.
4
5# Initially, modules "a", "b", and "c" are unrelated.
6#
7# The package import graph at v1 of everything looks like:
8#
9# m --- a
10# |
11# + --- b
12# |
13# + --- c
14#
15# At v2, package "a" adds imports of "b" and "c"
16# (and a requirement on "c" v2):
17#
18# a --- b
19# |
20# + --- c
21#
22# And "b" adds an import of "a/sub" (in module "a"):
23#
24# b --- a/sub
25#
26# At v3, "a" no longer imports (nor requires) "c":
27#
28# a --- b
29
30# So upgrading to a3 adds a dependency on b2,
31# b2 adds a dependency on a2 (for "a/sub"),
32# and a2 (but not a3) would add a dependency on c2.
33# Since a2 is lower than a3 it cannot possibly be selected when
34# upgrading to a3: normally a2 is pruned out of a3's module graph,
35# so 'go get' should prune it out too, and c should remain at c1
36# without error.
37
38go get a@v0.3.0
39
40go list -m c
41stdout '^c v0.1.0 '
42
43-- go.mod --
44module m
45
46go 1.19
47
48require (
49 a v0.1.0
50 b v0.1.0
51 c v0.1.0
52)
53
54replace (
55 a v0.1.0 => ./a1
56 a v0.2.0 => ./a2
57 a v0.3.0 => ./a3
58 b v0.1.0 => ./b1
59 b v0.2.0 => ./b2
60 c v0.1.0 => ./c1
61 c v0.2.0 => ./c2
62)
63-- m.go --
64package m
65
66import (
67 _ "a"
68 _ "b"
69 _ "c"
70)
71-- a1/go.mod --
72module a
73
74go 1.19
75-- a1/a.go --
76package a
77-- a2/go.mod --
78module a
79
80go 1.19
81
82require (
83 b v0.1.0
84 c v0.2.0
85)
86-- a2/a.go --
87package a
88
89import (
90 _ "b"
91 _ "c"
92)
93-- a2/sub/sub.go --
94package sub
95-- a3/go.mod --
96module a
97
98go 1.19
99
100require b v0.2.0
101-- a3/a.go --
102package a
103
104import _ "b"
105-- a3/sub/sub.go --
106package sub
107-- b1/go.mod --
108module b
109
110go 1.19
111-- b1/b.go --
112package b
113-- b2/go.mod --
114module b
115
116go 1.19
117
118require a v0.2.0
119-- b2/b.go --
120package b
121
122import "a/sub"
123-- c1/go.mod --
124module c
125
126go 1.19
127-- c1/c.go --
128package c
129-- c2/go.mod --
130module c
131
132go 1.19
133-- c2/c.go --
134package c
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