A. Unique TensorFlower <******@****.***> 1605121757 -0800

// issue 6269: name collision on method names for function local types.

package main

type foo struct{}

func (foo) Error() string {
	return "ok"
}

type bar struct{}

func (bar) Error() string {
	return "fail"
}

func unused() {
	type collision struct {
		bar
	}
	_ = collision{}
}

func main() {
	type collision struct {
		foo
	}
	s := error(collision{})

go list -json example/a
stdout 'case-insensitive import collision'

! go build example/a
stderr 'case-insensitive import collision'

# List files explicitly on command line, to encounter case-checking
# logic even on case-insensitive filesystems.
cp b/file.go b/FILE.go  # no-op on case-insensitive filesystems
! go list b/file.go b/FILE.go
stderr 'case-insensitive file name collision'

mkdir a/Pkg  # no-op on case-insensitive filesystems

stderr 'unzip.*badfile4[\\/]@v[\\/]v1.0.0.zip: rsc.io[\\/]badfile4@v1.0.0[\\/]x[\\/]y.go: case-insensitive file name collision: "x/Y.go" and "x/y.go"'
stderr 'unzip.*badfile5[\\/]@v[\\/]v1.0.0.zip: rsc.io[\\/]badfile5@v1.0.0[\\/]x[\\/]Y[\\/]zz[\\/]ww.go: case-insensitive file name collision: "x/y" and "x/Y"'

-- go.mod --

// A methodSet is a set of methods and name collisions.
// A collision indicates that multiple methods with the
// same unique id, or a field with that id appeared.
type methodSet map[string]*Selection // a nil entry indicates a name collision

// Add adds all functions in list to the method set s.
// If multiples is set, every function in list appears multiple times
// and is treated as a collision.

// Its generic security strength is 224 bits against preimage attacks,
// and 112 bits against collision attacks.
func New224() hash.Hash {
	return new224()
}

// New256 creates a new SHA3-256 hash.
// Its generic security strength is 256 bits against preimage attacks,
// and 128 bits against collision attacks.
func New256() hash.Hash {
	return new256()
}

// New384 creates a new SHA3-384 hash.

! go build
stderr 'case-insensitive import collision'

! go mod vendor
stderr 'case-insensitive import collision'

-- foo.go --
package main

import (
	_ "example.com/Foo"
	_ "example.com/foo"
)

func main() {}
-- go.mod --
module play.ground

go 1.14

require (
	example.com/foo v0.1.0
	example.com/Foo v0.1.0
)

replace (
	example.com/foo => ./foo
	example.com/Foo => ./foo_alt
)

 *       they appear. Input data is never modified. {@link HashFunction} instances should always be
 *       stateless, and therefore thread-safe.
 *   <li><b>collision-averse:</b> while it can't be helped that a hash function will sometimes
 *       produce the same hash code for distinct inputs (a "collision"), every hash function strives
 *       to <i>some</i> degree to make this unlikely. (Without this condition, a function that

 *       they appear. Input data is never modified. {@link HashFunction} instances should always be
 *       stateless, and therefore thread-safe.
 *   <li><b>collision-averse:</b> while it can't be helped that a hash function will sometimes
 *       produce the same hash code for distinct inputs (a "collision"), every hash function strives
 *       to <i>some</i> degree to make this unlikely. (Without this condition, a function that

        expect:
        changes(NORMALIZED, [
            "modified-with-collision/input": fingerprint("input", 1),
            "unmodified/input": fingerprint("input", 1)
        ], [
            "modified-with-collision/input": fingerprint("input", 0),
            "unmodified/input": fingerprint("input", 1)
        ]) == [modified("modified-with-collision/input": "input")]
    }