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# https://golang.org/issue/45952: 'go mod tidy' in an eager module failed due
# to an erroneous check on root completeness.
#
# Per the issue report:
# > It may have to do with:
# >
# > package A imports package B in go.mod, which imports package C in its own go.mod
# > package A drops direct dependency on package B …
#
# We infer from that that package C is still needed by some other indirect
# dependency, and must be at a higher version than what is required by that
# dependency (or else no new root would be needed). An additional package D
# in its own module satisfies that condition, reproducing the bug.

go mod tidy
cmp go.mod go.mod.tidy

-- go.mod --
module example.net/a

go 1.16

require (
	example.net/b v0.1.0
	example.net/d v0.1.0
)

replace (
	example.net/b v0.1.0 => ./b
	example.net/c v0.1.0 => ./c
	example.net/c v0.2.0 => ./c
	example.net/d v0.1.0 => ./d
)
-- go.mod.tidy --
module example.net/a

go 1.16

require (
	example.net/c v0.2.0 // indirect
	example.net/d v0.1.0
)

replace (
	example.net/b v0.1.0 => ./b
	example.net/c v0.1.0 => ./c
	example.net/c v0.2.0 => ./c
	example.net/d v0.1.0 => ./d
)
-- a.go --
package a

import _ "example.net/d"

-- b/go.mod --
module example.net/b

go 1.16

require example.net/c v0.2.0
-- b/b.go --
package b

import _ "example.net/c"

-- c/go.mod --
module example.net/c

go 1.16
-- c/c.go --
package c

-- d/go.mod --
module example.net/d

go 1.16

require example.net/c v0.1.0
-- d/d.go --
package d

import _ "example.net/c"