Add example of getReader bug

bug/Makefile

@@ -0,0 +1,7 @@
+build: clean compile
+
+clean:
+	rm -f ../html/test.wasm
+
+compile:
+	GOOS=js GOARCH=wasm GOROOT=$(GOPATH)/src/github.com/neelance/go/ $(GOPATH)/src/github.com/neelance/go/bin/go build -o ../html/test.wasm main.go

bug/main.go

@@ -0,0 +1,20 @@
+// +build js,wasm
+
+package main
+
+import (
+	"syscall/js"
+	"syscall/js/callback"
+)
+
+func main() {
+	wait := make(chan struct{})
+	promise := js.Global.Call("fetch", "https://api.github.com")
+	promise.Call("then", callback.New(func(args []js.Value) {
+		response := args[0]
+		r := response.Get("body").Call("getReader")
+		r.Call("read")
+		close(wait)
+	}).Value)
+	<-wait
+}