opt: bump up the minimum required Go version to 1.16

.github/workflows/test.yml

@@ -55,22 +55,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [1.13, 1.23]
+        go: [1.16, 1.23]
         os: [ubuntu-latest, macos-latest, windows-latest]
-        include:
-          # TODO(panjf2000): There is an uncanny issue arising when downloading
-          # go modules on macOS 13 for Go1.13. So we use macOS 12 for now,
-          # but try to figure it out and use macOS once it's resolved.
-          # https://github.com/panjf2000/ants/actions/runs/9546726268/job/26310385582
-          - go: 1.13
-            os: macos-12
-        exclude:
-          # Starting macOS 14 GitHub Actions runners are arm-based,
-          # but Go didn't support arm64 until 1.16. Thus, we must
-          # replace the macOS 14 runner with macOS 12 runner for Go 1.13.
-          # Ref: https://github.com/actions/runner-images/issues/9741
-          - go: 1.13
-            os: macos-latest
     name: Go ${{ matrix.go }} @ ${{ matrix.os }}
     runs-on: ${{ matrix.os}}
     steps:

ants.go

@@ -88,9 +88,7 @@ var (
 		return 1
 	}()
 
-	// log.Lmsgprefix is not available in go1.13, just make an identical value for it.
-	logLmsgprefix = 64
-	defaultLogger = Logger(log.New(os.Stderr, "[ants]: ", log.LstdFlags|logLmsgprefix|log.Lmicroseconds))
+	defaultLogger = Logger(log.New(os.Stderr, "[ants]: ", log.LstdFlags|log.Lmsgprefix|log.Lmicroseconds))
 
 	// Init an instance pool when importing ants.
 	defaultAntsPool, _ = NewPool(DefaultAntsPoolSize)

go.mod

@@ -1,8 +1,8 @@
 module github.com/panjf2000/ants/v2
 
-go 1.13
+go 1.16
 
 require (
-	github.com/stretchr/testify v1.8.2
-	golang.org/x/sync v0.3.0
+	github.com/stretchr/testify v1.10.0
+	golang.org/x/sync v0.10.0
 )

go.sum

@@ -6,12 +6,14 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
-github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
-golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=