const runtime.stackPoisonCopy

3 uses

	runtime (current package)
		stack.go#L115: 	stackPoisonCopy  = 0 // fill stack that should not be accessed with garbage, to detect bad dereferences during copy
		stack.go#L850: 	if stackPoisonCopy != 0 {
		stack.go#L911: 	if stackPoisonCopy != 0 {