common/prqueue: replace golang.org/exp/constraints.Ordered with cmp.Ordered

common/prque/lazyqueue.go

@@ -20,8 +20,8 @@ import (
 	"container/heap"
 	"time"
 
+	"cmp"
 	"github.com/ethereum/go-ethereum/common/mclock"
-	"golang.org/x/exp/constraints"
 )
 
 // LazyQueue is a priority queue data structure where priorities can change over
@@ -33,7 +33,7 @@ import (
 //
 // If the upper estimate is exceeded then Update should be called for that item.
 // A global Refresh function should also be called periodically.
-type LazyQueue[P constraints.Ordered, V any] struct {
+type LazyQueue[P cmp.Ordered, V any] struct {
 	clock mclock.Clock
 	// Items are stored in one of two internal queues ordered by estimated max
 	// priority until the next and the next-after-next refresh. Update and Refresh
@@ -50,12 +50,12 @@ type LazyQueue[P constraints.Ordered, V any] struct {
 }
 
 type (
-	PriorityCallback[P constraints.Ordered, V any]    func(data V) P                       // actual priority callback
+	PriorityCallback[P cmp.Ordered, V any]    func(data V) P                       // actual priority callback
-	MaxPriorityCallback[P constraints.Ordered, V any] func(data V, until mclock.AbsTime) P // estimated maximum priority callback
+	MaxPriorityCallback[P cmp.Ordered, V any] func(data V, until mclock.AbsTime) P // estimated maximum priority callback
 )
 
 // NewLazyQueue creates a new lazy queue
-func NewLazyQueue[P constraints.Ordered, V any](setIndex SetIndexCallback[V], priority PriorityCallback[P, V], maxPriority MaxPriorityCallback[P, V], clock mclock.Clock, refreshPeriod time.Duration) *LazyQueue[P, V] {
+func NewLazyQueue[P cmp.Ordered, V any](setIndex SetIndexCallback[V], priority PriorityCallback[P, V], maxPriority MaxPriorityCallback[P, V], clock mclock.Clock, refreshPeriod time.Duration) *LazyQueue[P, V] {
 	q := &LazyQueue[P, V]{
 		popQueue:     newSstack[P, V](nil),
 		setIndex:     setIndex,

common/prque/prque.go

@@ -18,18 +18,17 @@
 package prque
 
 import (
+	"cmp"
 	"container/heap"
-
-	"golang.org/x/exp/constraints"
 )
 
 // Priority queue data structure.
-type Prque[P constraints.Ordered, V any] struct {
+type Prque[P cmp.Ordered, V any] struct {
 	cont *sstack[P, V]
 }
 
 // New creates a new priority queue.
-func New[P constraints.Ordered, V any](setIndex SetIndexCallback[V]) *Prque[P, V] {
+func New[P cmp.Ordered, V any](setIndex SetIndexCallback[V]) *Prque[P, V] {
 	return &Prque[P, V]{newSstack[P, V](setIndex)}
 }
 

common/prque/sstack.go

@@ -10,13 +10,13 @@
 
 package prque
 
-import "golang.org/x/exp/constraints"
+import "cmp"
 
 // The size of a block of data
 const blockSize = 4096
 
 // A prioritized item in the sorted stack.
-type item[P constraints.Ordered, V any] struct {
+type item[P cmp.Ordered, V any] struct {
 	value    V
 	priority P
 }
@@ -29,7 +29,7 @@ type SetIndexCallback[V any] func(data V, index int)
 // Internal sortable stack data structure. Implements the Push and Pop ops for
 // the stack (heap) functionality and the Len, Less and Swap methods for the
 // sortability requirements of the heaps.
-type sstack[P constraints.Ordered, V any] struct {
+type sstack[P cmp.Ordered, V any] struct {
 	setIndex SetIndexCallback[V]
 	size     int
 	capacity int
@@ -40,7 +40,7 @@ type sstack[P constraints.Ordered, V any] struct {
 }
 
 // Creates a new, empty stack.
-func newSstack[P constraints.Ordered, V any](setIndex SetIndexCallback[V]) *sstack[P, V] {
+func newSstack[P cmp.Ordered, V any](setIndex SetIndexCallback[V]) *sstack[P, V] {
 	result := new(sstack[P, V])
 	result.setIndex = setIndex
 	result.active = make([]*item[P, V], blockSize)