// 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
)

        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")]
    }

// bits of output, their collision-resistance is only "x/2" bits.
//
// The SHAKE-256 and -128 functions have a generic security strength of 256 and
// 128 bits against all attacks, provided that at least 2x bits of their output
// is used.  Requesting more than 64 or 32 bytes of output, respectively, does
// not increase the collision-resistance of the SHAKE functions.
//
// # The sponge construction
//

        def hash = hasher.hash()
        hash != Hashing.hashString("abc")
    }

    def 'hash collision for bytes'() {
        def left = [[1, 2, 3], [4, 5]]
        def right = [[1, 2], [3, 4, 5]]
        expect:
        hashKey(left) != hashKey(right)
    }

    def 'hash collision for strings'() {
        expect:
        hashStrings(["abc", "de"]) != hashStrings(["ab", "cde"])
    }

     * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
     */
    public DuplicateProjectException(String message, Map<String, List<File>> collisions) {
        super(message, (File) null);

        this.collisions = (collisions != null) ? collisions : new LinkedHashMap<>();
    }

    /**
     * Gets the POM files of the projects that collided.
     *

	id := rtcov.AddMeta(p, dlen, hash, pkgpath, pkgid, cmode, cgran)
	if id == 0 {
		throw("runtime.addCovMeta: coverage package map collision")
	}
	return id

 *
 * The methods of this interface are awkwardly prefixed to allow
 * internal types to implement this interface along with other internal interfaces
 * without risking method collision.
 *
 * @since 4.0
 */
@UsedByScanPlugin
public interface BuildOperationStartedNotification {

    /**
     * A unique, opaque, value identifying this operation.
     */

	message := []byte("message to be signed")

	// Only small messages can be signed directly; thus the hash of a
	// message, rather than the message itself, is signed. This requires
	// that the hash function be collision resistant. SHA-256 is the
	// least-strong hash function that should be used for this at the time
	// of writing (2016).
	hashed := sha256.Sum256(message)