cmd: update vendored golang.org/x/mod

Pull in CL 492990. This teaches 'go mod tidy' and other go subcommands
that write go.mod files to use semantic sort for exclude blocks, gated
on said files declaring Go version 1.21 or higher.

go get golang.org/x/mod@e7bea8f1d64f  # includes CL 492990
go mod tidy
go mod vendor

Fixes #60028.

Change-Id: Ia9342dcc23cd68de068a70657b59c25f69afa381
Reviewed-on: https://go-review.googlesource.com/c/go/+/494578
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>

5 files changed, 63 insertions, 5 deletions

diff --git a/src/cmd/go.mod b/src/cmd/go.mod
index 529fc402dd..746d4428f9 100644
--- a/src/cmd/go.mod
+++ b/src/cmd/go.mod
@@ -5,7 +5,7 @@ go 1.21
 require (
 	github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26
 	golang.org/x/arch v0.2.1-0.20230208145055-40c19ba4a7c5
-	golang.org/x/mod v0.10.0
+	golang.org/x/mod v0.10.1-0.20230517154618-e7bea8f1d64f
 	golang.org/x/sync v0.2.0
 	golang.org/x/sys v0.8.0
 	golang.org/x/term v0.5.0
diff --git a/src/cmd/go.sum b/src/cmd/go.sum
index d964d568e4..db69eb0300 100644
--- a/src/cmd/go.sum
+++ b/src/cmd/go.sum
@@ -4,8 +4,8 @@ github.com/ianlancetaylor/demangle v0.0.0-20220319035150-800ac71e25c2 h1:rcanfLh
 github.com/ianlancetaylor/demangle v0.0.0-20220319035150-800ac71e25c2/go.mod h1:aYm2/VgdVmcIU8iMfdMvDMsRAQjcfZSKFby6HOFvi/w=
 golang.org/x/arch v0.2.1-0.20230208145055-40c19ba4a7c5 h1:UFbINK7+lzLJEIqCXPlzx05ivYhLQeXCkxW3SSH3f8Q=
 golang.org/x/arch v0.2.1-0.20230208145055-40c19ba4a7c5/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
-golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
-golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.10.1-0.20230517154618-e7bea8f1d64f h1:ghNt+qaUoQ453QdEj40jEN5kYz71m4aDEkk767JfeR0=
+golang.org/x/mod v0.10.1-0.20230517154618-e7bea8f1d64f/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
 golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
diff --git a/src/cmd/go/testdata/script/mod_exclude_go121.txt b/src/cmd/go/testdata/script/mod_exclude_go121.txt
new file mode 100644
index 0000000000..51c8a00a43
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_exclude_go121.txt
@@ -0,0 +1,34 @@
+# go.dev/issue/60028: use semver sort in exclude block in 1.21
+cp $WORK/go.mod.badfmtexclude go.mod
+go mod edit -go=1.20
+cmp go.mod $WORK/go.mod.goodfmtexclude120
+go mod edit -go=1.21
+cmp go.mod $WORK/go.mod.goodfmtexclude121
+
+-- $WORK/go.mod.badfmtexclude --
+module     x.x/y/z
+exclude  (
+	x.1   v1.11.0
+	x.1    v1.10.0
+	x.1     v1.9.0
+)
+-- $WORK/go.mod.goodfmtexclude120 --
+module x.x/y/z
+
+go 1.20
+
+exclude (
+	x.1 v1.10.0
+	x.1 v1.11.0
+	x.1 v1.9.0
+)
+-- $WORK/go.mod.goodfmtexclude121 --
+module x.x/y/z
+
+go 1.21
+
+exclude (
+	x.1 v1.9.0
+	x.1 v1.10.0
+	x.1 v1.11.0
+)
diff --git a/src/cmd/vendor/golang.org/x/mod/modfile/rule.go b/src/cmd/vendor/golang.org/x/mod/modfile/rule.go
index 6bcde8fabe..c20aef1566 100644
--- a/src/cmd/vendor/golang.org/x/mod/modfile/rule.go
+++ b/src/cmd/vendor/golang.org/x/mod/modfile/rule.go
@@ -1387,13 +1387,21 @@ func (f *File) DropRetract(vi VersionInterval) error {
 func (f *File) SortBlocks() {
 	f.removeDups() // otherwise sorting is unsafe
 
+	// semanticSortForExcludeVersionV is the Go version (plus leading "v") at which
+	// lines in exclude blocks start to use semantic sort instead of lexicographic sort.
+	// See go.dev/issue/60028.
+	const semanticSortForExcludeVersionV = "v1.21"
+	useSemanticSortForExclude := f.Go != nil && semver.Compare("v"+f.Go.Version, semanticSortForExcludeVersionV) >= 0
+
 	for _, stmt := range f.Syntax.Stmt {
 		block, ok := stmt.(*LineBlock)
 		if !ok {
 			continue
 		}
 		less := lineLess
-		if block.Token[0] == "retract" {
+		if block.Token[0] == "exclude" && useSemanticSortForExclude {
+			less = lineExcludeLess
+		} else if block.Token[0] == "retract" {
 			less = lineRetractLess
 		}
 		sort.SliceStable(block.Line, func(i, j int) bool {
@@ -1496,6 +1504,22 @@ func lineLess(li, lj *Line) bool {
 	return len(li.Token) < len(lj.Token)
 }
 
+// lineExcludeLess reports whether li should be sorted before lj for lines in
+// an "exclude" block.
+func lineExcludeLess(li, lj *Line) bool {
+	if len(li.Token) != 2 || len(lj.Token) != 2 {
+		// Not a known exclude specification.
+		// Fall back to sorting lexicographically.
+		return lineLess(li, lj)
+	}
+	// An exclude specification has two tokens: ModulePath and Version.
+	// Compare module path by string order and version by semver rules.
+	if pi, pj := li.Token[0], lj.Token[0]; pi != pj {
+		return pi < pj
+	}
+	return semver.Compare(li.Token[1], lj.Token[1]) < 0
+}
+
 // lineRetractLess returns whether li should be sorted before lj for lines in
 // a "retract" block. It treats each line as a version interval. Single versions
 // are compared as if they were intervals with the same low and high version.
diff --git a/src/cmd/vendor/modules.txt b/src/cmd/vendor/modules.txt
index 2cf140f093..40e45bba5f 100644
--- a/src/cmd/vendor/modules.txt
+++ b/src/cmd/vendor/modules.txt
@@ -23,7 +23,7 @@ golang.org/x/arch/arm/armasm
 golang.org/x/arch/arm64/arm64asm
 golang.org/x/arch/ppc64/ppc64asm
 golang.org/x/arch/x86/x86asm
-# golang.org/x/mod v0.10.0
+# golang.org/x/mod v0.10.1-0.20230517154618-e7bea8f1d64f
 ## explicit; go 1.17
 golang.org/x/mod/internal/lazyregexp
 golang.org/x/mod/modfile