x/tools/cmd/present: slides.js not running on safari

[glorieux]

1. What version of Go are you using (go version)?
   go version go1.5 darwin/amd64
2. What operating system and processor architecture are you using (go env)?
   GOARCH="amd64"
   GOBIN=""
   GOEXE=""
   GOHOSTARCH="amd64"
   GOHOSTOS="darwin"
   GOOS="darwin"
   GOPATH="/Users/glorieux/Workspace/gocode"
   GORACE=""
   GOROOT="/usr/local/go"
   GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
   GO15VENDOREXPERIMENT=""
   CC="clang"
   GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
   CXX="clang++"
   CGO_ENABLED="1"
3. What did you do?
   Install present.
   Create a really simple slide presentation.
   Run present
   Open Safari.
4. What did you expect to see?
   I expected the slides to display on Safari.
5. What did you see instead?
   It did not display and raised the following error on the console: SyntaxError: Unexpected identifier 'i'. Expected either 'in' or 'of' in enumeration syntax. (anonymous function)slides.js:540
6. Fix
   Since Safari is not yet supporting ES6 let statements they need to be replaced by var ones.

Looks like the bug was introduced by https://go-review.googlesource.com/21488

[binary132]

I confirm this is affecting me and other users of my hosted slides with latest present.

[gopherbot]

CL https://golang.org/cl/24721 mentions this issue.