all: use slices.Delete

Change-Id: Ifb6aa07b32127907cdc2df44b2dbddd6296775c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/616737
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

src/cmd/cgo/internal/testerrors/ptr_test.go

@@ -607,7 +607,7 @@ func buildPtrTests(t *testing.T, gopath string, cgocheck2 bool) (exe string) {
 		goexperiment = append(goexperiment, "cgocheck2")
 		changed = true
 	} else if !cgocheck2 && i >= 0 {
-		goexperiment = append(goexperiment[:i], goexperiment[i+1:]...)
+		goexperiment = slices.Delete(goexperiment, i, i+1)
 		changed = true
 	}
 	if changed {

src/cmd/compile/internal/ssa/debug.go

@@ -1681,7 +1681,7 @@ func locatePrologEnd(f *Func, needCloCtx bool) (ID, *Value) {
 	removeReg := func(r ID) bool {
 		for i := 0; i < len(regArgs); i++ {
 			if regArgs[i] == r {
-				regArgs = append(regArgs[:i], regArgs[i+1:]...)
+				regArgs = slices.Delete(regArgs, i, i+1)
 				return true
 			}
 		}

src/cmd/compile/internal/ssa/poset.go

@@ -7,6 +7,7 @@ package ssa
 import (
 	"fmt"
 	"os"
+	"slices"
 )
 
 // If true, check poset integrity after every mutation
@@ -350,7 +351,7 @@ func (po *poset) changeroot(oldr, newr uint32) {
 func (po *poset) removeroot(r uint32) {
 	for i := range po.roots {
 		if po.roots[i] == r {
-			po.roots = append(po.roots[:i], po.roots[i+1:]...)
+			po.roots = slices.Delete(po.roots, i, i+1)
 			return
 		}
 	}

src/cmd/fix/netipv6zone.go

@@ -4,7 +4,10 @@
 
 package main
 
-import "go/ast"
+import (
+	"go/ast"
+	"slices"
+)
 
 func init() {
 	register(netipv6zoneFix)
@@ -52,7 +55,7 @@ func netipv6zone(f *ast.File) bool {
 					}
 				case 1:
 					if elit, ok := e.(*ast.BasicLit); ok && elit.Value == "0" {
-						cl.Elts = append(cl.Elts[:i], cl.Elts[i+1:]...)
+						cl.Elts = slices.Delete(cl.Elts, i, i+1)
 					} else {
 						cl.Elts[i] = &ast.KeyValueExpr{
 							Key:   ast.NewIdent("Port"),

src/cmd/go/go_test.go

@@ -25,6 +25,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"testing"
@@ -473,7 +474,7 @@ func (tg *testgoData) unsetenv(name string) {
 	}
 	for i, v := range tg.env {
 		if strings.HasPrefix(v, name+"=") {
-			tg.env = append(tg.env[:i], tg.env[i+1:]...)
+			tg.env = slices.Delete(tg.env, i, i+1)
 			break
 		}
 	}

src/go/token/position.go

@@ -503,7 +503,7 @@ func (s *FileSet) RemoveFile(file *File) {
 
 	if i := searchFiles(s.files, file.base); i >= 0 && s.files[i] == file {
 		last := &s.files[len(s.files)-1]
-		s.files = append(s.files[:i], s.files[i+1:]...)
+		s.files = slices.Delete(s.files, i, i+1)
 		*last = nil // don't prolong lifetime when popping last element
 	}
 }