}
        }
        registry.configure(ModelActionRole.Mutate) {
            it.path("b").descriptor("b-mutate").action { Bean b ->
                b.value = "b-mutate"
            }
        }
        registry.configure(ModelActionRole.Mutate) {
            it.path("a").descriptor("a-mutate").action { Bean a ->
                a.value = "a-mutate"
            }
        }

	var curCtx, newCtx schedCtx
	curCtx.M = m
	newCtx.M = m

	var ms *mState
	if m == NoThread {
		curCtx.P = NoProc
		curCtx.G = NoGoroutine
		newCtx = curCtx
	} else {
		// Pull out or create the mState for this event.
		var ok bool
		ms, ok = o.mStates[m]
		if !ok {
			ms = &mState{
				g: NoGoroutine,
				p: NoProc,
			}
			o.mStates[m] = ms
		}
		curCtx.P = ms.p
		curCtx.G = ms.g
		newCtx = curCtx

func (cmc *cacheMutationCheck) Check(t *testing.T) {
	for _, o := range cmc.objects {
		if !reflect.DeepEqual(o.original, o.deepCopy) {
			// Cached objects can't be safely mutated and instead should be deep
			// copied before changed in any way.
			t.Errorf("Cached object was unexpectedly mutated. Original: %+v, Mutated: %+v", o.deepCopy, o.original)
		}
	}
}

        // If an external party has seen the public state (variant metadata) of our configuration,
        // we forbid any mutation that mutates the public state. The resolution strategy does
        // not mutate the public state of the configuration, so we allow it.
        if (observed && type != MutationType.STRATEGY) {

	// background scan. This credit is accumulated by the background scan
	// and stolen by mutator assists.  Updates occur in bounded batches,
	// since it is both written and read throughout the cycle.
	bgScanCredit atomic.Int64

	// assistTime is the nanoseconds spent in mutator assists
	// during this cycle. This is updated atomically, and must also

        then:
        collection.from as List == ["src1", "src2"]

        when:
        collection.from = ["a", "b"]
        then:
        collection.from as List == [["a", "b"]]
    }

    def "can mutate the from collection"() {
        collection.from("src1", "src2")
        def from = collection.from

        when:
        from.clear()

        then:
        from.empty
        collection.from.empty

	parentRefs := extractParentReferenceInfo(ctx.GatewayReferences, route.ParentRefs, route.Hostnames, gvk.HTTPRoute, obj.Namespace)
	reportStatus := func(results []RouteParentResult) {
		obj.Status.(*kstatus.WrappedStatus).Mutate(func(s config.Status) config.Status {
			rs := s.(*k8s.HTTPRouteStatus)
			rs.Parents = createRouteStatus(results, obj, rs.Parents)
			return rs
		})
	}

	type conversionResult struct {

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Garbage collector (GC).
//
// The GC runs concurrently with mutator threads, is type accurate (aka precise), allows multiple
// GC thread to run in parallel. It is a concurrent mark and sweep that uses a write barrier. It is

					// we do not expect HBONE traffic to have mutated user traffic
					// presently ExpectMTLS is checking that headers were added to user traffic
					ExpectMTLS: Never,
				},
				{
					ConfigFile:    "beta-mtls-permissive.yaml",
					Namespace:     systemNM,
					Include:       Always,
					ExpectSuccess: SupportsHBone,
					// we do not expect HBONE traffic to have mutated user traffic

=== Deprecations

[[mutate_configuration_after_locking]]
==== Deprecate mutating configuration after observation

To ensure the accuracy of dependency resolution, Gradle checks that Configurations are not mutated after they have been used as part of a dependency graph.

* Resolvable configurations should not have their resolution strategy, dependencies, hierarchy, etc. modified after they have been resolved.