dev: updates internal code borrowed from Go

.golangci.yml

@@ -222,8 +222,10 @@ issues:
   exclude-dirs:
     - test/testdata_etc # test files
     - internal/cache # extracted from Go code
-    - internal/renameio # extracted from Go code
     - internal/robustio # extracted from Go code
+    - internal/mmap # extracted from Go code
+    - internal/quoted # extracted from Go code
+    - internal/testenv # extracted from Go code
 
 run:
   timeout: 5m

go.mod

@@ -87,6 +87,7 @@ require (
 	github.com/polyfloyd/go-errorlint v1.6.0
 	github.com/quasilyte/go-ruleguard/dsl v0.3.22
 	github.com/raeperd/recvcheck v0.1.2
+	github.com/rogpeppe/go-internal v1.13.1
 	github.com/ryancurrah/gomodguard v1.3.5
 	github.com/ryanrolds/sqlclosecheck v0.5.1
 	github.com/sanposhiho/wastedassign/v2 v2.0.7
@@ -127,6 +128,7 @@ require (
 	go-simpler.org/sloglint v0.7.2
 	go.uber.org/automaxprocs v1.6.0
 	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0
+	golang.org/x/sys v0.26.0
 	golang.org/x/tools v0.26.0
 	gopkg.in/yaml.v3 v3.0.1
 	honnef.co/go/tools v0.5.1
@@ -193,7 +195,6 @@ require (
 	golang.org/x/exp/typeparams v0.0.0-20240909161429-701f63a606c0 // indirect
 	golang.org/x/mod v0.21.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
-	golang.org/x/sys v0.26.0 // indirect
 	golang.org/x/text v0.18.0 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect

internal/cache/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.