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Change-Id: I9f8b6f64238a5a1bab06f20f1531c08041394d27

Author: qiulaidongfeng

src/cmd/go/testdata/script/env_changed.txt

@@ -44,6 +44,9 @@ go env -changed -json GOARCH
 [GOARCH:amd64] stdout '"GOARCH": "arm64"'
 [!GOARCH:amd64] stdout '"GOARCH": "amd64"'
 
+# flipped GOOS, and now flip it backwards.
+[GOARCH:arm64] env GOARCH=amd64
+[!GOARCH:arm64] env GOARCH=arm64
 [!GOARCH:amd64] skip
 env GOAMD64=v3
 go env -changed