# By default, this rule isn't enabled.
gofumpt foo.go
cmp stdout foo.go

# It's run with -extra. Note that the flag isn't available in gofumports,
# following the lack of -s.
[!gofumpt] skip
gofumpt -extra foo.go
cmp stdout foo.go.golden

gofumpt -d foo.go.golden
! stdout .

-- foo.go --
package p

type f func(x int, y int) int

type i interface {
	add(x int, y int)
}

type s struct {
	x int
	y int
}

func mergeAdjacent(x int, y int) {}

func mergeThreeAdjacent(x int, y int, z int) {}

func mergeOneWithTwo(x, y int, z int) {}

func mergeTwoWithOne(x int, y, z int) {}

func mergeWithComment(
	x int, y int, // comment
)

func mergeAllSyntax(x chan []*foo.Bar, y chan []*foo.Bar) {}

func dontMergeAnonymousParams(int, int) {}

func dontMergeMultipleLines(
	x int,
	y int,
) {
}

func dontMergeMultipleLines2(
	x,
	y int,
	z int,
) {
}
-- foo.go.golden --
package p

type f func(x, y int) int

type i interface {
	add(x, y int)
}

type s struct {
	x int
	y int
}

func mergeAdjacent(x, y int) {}

func mergeThreeAdjacent(x, y, z int) {}

func mergeOneWithTwo(x, y, z int) {}

func mergeTwoWithOne(x, y, z int) {}

func mergeWithComment(
	x, y int, // comment
)

func mergeAllSyntax(x, y chan []*foo.Bar) {}

func dontMergeAnonymousParams(int, int) {}

func dontMergeMultipleLines(
	x int,
	y int,
) {
}

func dontMergeMultipleLines2(
	x,
	y int,
	z int,
) {
}