timeafter: skip check on Go ≥ 1.23

Go version ≥ 1.23 no longer has the issue of not collecting unstopped
Timers and time.After can safely be used in loops. Also see
https://go.dev/doc/go1.23#timer-changes and
https://cs.opensource.google/go/go/+/refs/tags/go1.23.2:src/time/sleep.go;l=196-201

Thus we can skip the timeafter check on modules with go.mod specifying
go1.23 or later.

Signed-off-by: Tobias Klauser <[email protected]>

go.mod

@@ -4,10 +4,8 @@ go 1.22.0
 
 require (
 	golang.org/x/exp v0.0.0-20230809094429-853ea248256d
+	golang.org/x/mod v0.21.0
 	golang.org/x/tools v0.26.0
 )
 
-require (
-	golang.org/x/mod v0.21.0 // indirect
-	golang.org/x/sync v0.8.0 // indirect
-)
+require golang.org/x/sync v0.8.0 // indirect

timeafter/time_after.go

@@ -9,6 +9,7 @@ import (
 	"go/ast"
 	"strings"
 
+	"golang.org/x/mod/semver"
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/inspect"
 	"golang.org/x/tools/go/ast/inspector"
@@ -50,6 +51,18 @@ func run(pass *analysis.Pass) (interface{}, error) {
 		return nil, errors.New("analyzer is not type *inspector.Inspector")
 	}
 
+	var goVersion string
+	if pass.Module != nil {
+		goVersion = pass.Module.GoVersion
+	}
+	if semver.Compare(goVersion, "v1.23.0") >= 0 {
+		// Go version ≥ 1.23 no longer has the issue of not collecting unstopped Timers and
+		// time.After can safely be used in loops. Also see
+		// https://go.dev/doc/go1.23#timer-changes and
+		// https://cs.opensource.google/go/go/+/refs/tags/go1.23.2:src/time/sleep.go;l=196-201
+		return nil, nil
+	}
+
 	ignoreMap := make(map[string]struct{})
 	for _, ign := range strings.Split(ignoreArg, ",") {
 		ignoreMap[strings.TrimSpace(ign)] = struct{}{}