update to golang.org/x/{crypto,net,text,sync,tools}@latest

vendor/golang.org/x/tools/internal/aliases/aliases.go

@@ -16,10 +16,14 @@ import (
 // NewAlias creates a new TypeName in Package pkg that
 // is an alias for the type rhs.
 //
-// When GoVersion>=1.22 and GODEBUG=gotypesalias=1,
-// the Type() of the return value is a *types.Alias.
-func NewAlias(pos token.Pos, pkg *types.Package, name string, rhs types.Type) *types.TypeName {
-	if enabled() {
+// The enabled parameter determines whether the resulting [TypeName]'s
+// type is an [types.Alias]. Its value must be the result of a call to
+// [Enabled], which computes the effective value of
+// GODEBUG=gotypesalias=... by invoking the type checker. The Enabled
+// function is expensive and should be called once per task (e.g.
+// package import), not once per call to NewAlias.
+func NewAlias(enabled bool, pos token.Pos, pkg *types.Package, name string, rhs types.Type) *types.TypeName {
+	if enabled {
 		tname := types.NewTypeName(pos, pkg, name, nil)
 		newAlias(tname, rhs)
 		return tname

vendor/golang.org/x/tools/internal/aliases/aliases_go121.go

@@ -15,16 +15,21 @@ import (
 // It will never be created by go/types.
 type Alias struct{}
 
-func (*Alias) String() string { panic("unreachable") }
-
-func (*Alias) Underlying() types.Type { panic("unreachable") }
-
-func (*Alias) Obj() *types.TypeName { panic("unreachable") }
+func (*Alias) String() string                                { panic("unreachable") }
+func (*Alias) Underlying() types.Type                        { panic("unreachable") }
+func (*Alias) Obj() *types.TypeName                          { panic("unreachable") }
+func Rhs(alias *Alias) types.Type                            { panic("unreachable") }
+func TypeParams(alias *Alias) *types.TypeParamList           { panic("unreachable") }
+func SetTypeParams(alias *Alias, tparams []*types.TypeParam) { panic("unreachable") }
+func TypeArgs(alias *Alias) *types.TypeList                  { panic("unreachable") }
+func Origin(alias *Alias) *Alias                             { panic("unreachable") }
 
 // Unalias returns the type t for go <=1.21.
 func Unalias(t types.Type) types.Type { return t }
 
-// Always false for go <=1.21. Ignores GODEBUG.
-func enabled() bool { return false }
-
 func newAlias(name *types.TypeName, rhs types.Type) *Alias { panic("unreachable") }
+
+// Enabled reports whether [NewAlias] should create [types.Alias] types.
+//
+// Before go1.22, this function always returns false.
+func Enabled() bool { return false }

vendor/golang.org/x/tools/internal/aliases/aliases_go122.go

@@ -12,14 +12,58 @@ import (
 	"go/parser"
 	"go/token"
 	"go/types"
-	"os"
-	"strings"
-	"sync"
 )
 
 // Alias is an alias of types.Alias.
 type Alias = types.Alias
 
+// Rhs returns the type on the right-hand side of the alias declaration.
+func Rhs(alias *Alias) types.Type {
+	if alias, ok := any(alias).(interface{ Rhs() types.Type }); ok {
+		return alias.Rhs() // go1.23+
+	}
+
+	// go1.22's Alias didn't have the Rhs method,
+	// so Unalias is the best we can do.
+	return Unalias(alias)
+}
+
+// TypeParams returns the type parameter list of the alias.
+func TypeParams(alias *Alias) *types.TypeParamList {
+	if alias, ok := any(alias).(interface{ TypeParams() *types.TypeParamList }); ok {
+		return alias.TypeParams() // go1.23+
+	}
+	return nil
+}
+
+// SetTypeParams sets the type parameters of the alias type.
+func SetTypeParams(alias *Alias, tparams []*types.TypeParam) {
+	if alias, ok := any(alias).(interface {
+		SetTypeParams(tparams []*types.TypeParam)
+	}); ok {
+		alias.SetTypeParams(tparams) // go1.23+
+	} else if len(tparams) > 0 {
+		panic("cannot set type parameters of an Alias type in go1.22")
+	}
+}
+
+// TypeArgs returns the type arguments used to instantiate the Alias type.
+func TypeArgs(alias *Alias) *types.TypeList {
+	if alias, ok := any(alias).(interface{ TypeArgs() *types.TypeList }); ok {
+		return alias.TypeArgs() // go1.23+
+	}
+	return nil // empty (go1.22)
+}
+
+// Origin returns the generic Alias type of which alias is an instance.
+// If alias is not an instance of a generic alias, Origin returns alias.
+func Origin(alias *Alias) *Alias {
+	if alias, ok := any(alias).(interface{ Origin() *types.Alias }); ok {
+		return alias.Origin() // go1.23+
+	}
+	return alias // not an instance of a generic alias (go1.22)
+}
+
 // Unalias is a wrapper of types.Unalias.
 func Unalias(t types.Type) types.Type { return types.Unalias(t) }
 
@@ -33,40 +77,23 @@ func newAlias(tname *types.TypeName, rhs types.Type) *Alias {
 	return a
 }
 
-// enabled returns true when types.Aliases are enabled.
-func enabled() bool {
-	// Use the gotypesalias value in GODEBUG if set.
-	godebug := os.Getenv("GODEBUG")
-	value := -1 // last set value.
-	for _, f := range strings.Split(godebug, ",") {
-		switch f {
-		case "gotypesalias=1":
-			value = 1
-		case "gotypesalias=0":
-			value = 0
-		}
-	}
-	switch value {
-	case 0:
-		return false
-	case 1:
-		return true
-	default:
-		return aliasesDefault()
-	}
+// Enabled reports whether [NewAlias] should create [types.Alias] types.
+//
+// This function is expensive! Call it sparingly.
+func Enabled() bool {
+	// The only reliable way to compute the answer is to invoke go/types.
+	// We don't parse the GODEBUG environment variable, because
+	// (a) it's tricky to do so in a manner that is consistent
+	//     with the godebug package; in particular, a simple
+	//     substring check is not good enough. The value is a
+	//     rightmost-wins list of options. But more importantly:
+	// (b) it is impossible to detect changes to the effective
+	//     setting caused by os.Setenv("GODEBUG"), as happens in
+	//     many tests. Therefore any attempt to cache the result
+	//     is just incorrect.
+	fset := token.NewFileSet()
+	f, _ := parser.ParseFile(fset, "a.go", "package p; type A = int", 0)
+	pkg, _ := new(types.Config).Check("p", fset, []*ast.File{f}, nil)
+	_, enabled := pkg.Scope().Lookup("A").Type().(*types.Alias)
+	return enabled
 }
-
-// aliasesDefault reports if aliases are enabled by default.
-func aliasesDefault() bool {
-	// Dynamically check if Aliases will be produced from go/types.
-	aliasesDefaultOnce.Do(func() {
-		fset := token.NewFileSet()
-		f, _ := parser.ParseFile(fset, "a.go", "package p; type A = int", 0)
-		pkg, _ := new(types.Config).Check("p", fset, []*ast.File{f}, nil)
-		_, gotypesaliasDefault = pkg.Scope().Lookup("A").Type().(*types.Alias)
-	})
-	return gotypesaliasDefault
-}
-
-var gotypesaliasDefault bool
-var aliasesDefaultOnce sync.Once