go/build: use slices.Equal

Change-Id: Id10293b6fe7a5916599fd4684430d694bb8c8920
Reviewed-on: https://go-review.googlesource.com/c/go/+/690615
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Sean Liao <sean@liao.dev>

diff --git a/src/go/build/build.go b/src/go/build/build.go
index 76866c7487adf43eb257eaf6e7ed68c645c77ee1..68fb8dbbd7ab6988303585e3fecb20aeac3ef47d 100644 (file)
--- a/src/go/build/build.go
+++ b/src/go/build/build.go
@@ -1139,7 +1139,7 @@ func (ctxt *Context) importGo(p *Package, path, srcDir string, mode ImportMode)
        // we must not being doing special things like AllowBinary or IgnoreVendor,
        // and all the file system callbacks must be nil (we're meant to use the local file system).
        if mode&AllowBinary != 0 || mode&IgnoreVendor != 0 ||
-               ctxt.JoinPath != nil || ctxt.SplitPathList != nil || ctxt.IsAbsPath != nil || ctxt.IsDir != nil || ctxt.HasSubdir != nil || ctxt.ReadDir != nil || ctxt.OpenFile != nil || !equal(ctxt.ToolTags, defaultToolTags) || !equal(ctxt.ReleaseTags, defaultReleaseTags) {
+               ctxt.JoinPath != nil || ctxt.SplitPathList != nil || ctxt.IsAbsPath != nil || ctxt.IsDir != nil || ctxt.HasSubdir != nil || ctxt.ReadDir != nil || ctxt.OpenFile != nil || !slices.Equal(ctxt.ToolTags, defaultToolTags) || !slices.Equal(ctxt.ReleaseTags, defaultReleaseTags) {
                return errNoModules
        }
 
@@ -1279,18 +1279,6 @@ func (ctxt *Context) importGo(p *Package, path, srcDir string, mode ImportMode)
        return nil
 }
 
-func equal(x, y []string) bool {
-       if len(x) != len(y) {
-               return false
-       }
-       for i, xi := range x {
-               if xi != y[i] {
-                       return false
-               }
-       }
-       return true
-}
-
 // hasGoFiles reports whether dir contains any files with names ending in .go.
 // For a vendor check we must exclude directories that contain no .go files.
 // Otherwise it is not possible to vendor just a/b/c and still import the