compiler/natives/src/runtime: Keep throw accessible for Go code to use.

dmitshur · dmitshur · commit 72e0b648528e · 2017-08-25T14:19:47.000-04:00
In Go 1.9, runtime.panicwrap uses throw. So it needs to be accessible
from Go code now.

Fixes:

	../src/runtime/error.go:134:3: undeclared name: throw
	../src/runtime/error.go:144:3: undeclared name: throw
	../src/runtime/error.go:148:3: undeclared name: throw
	../src/runtime/error.go:153:3: undeclared name: throw
	../src/runtime/error.go:156:3: undeclared name: throw
diff --git a/compiler/natives/src/runtime/runtime.go b/compiler/natives/src/runtime/runtime.go
@@ -27,9 +27,7 @@ func init() {
 	jsPkg := js.Global.Get("$packages").Get("github.com/gopherjs/gopherjs/js")
 	js.Global.Set("$jsObjectPtr", jsPkg.Get("Object").Get("ptr"))
 	js.Global.Set("$jsErrorPtr", jsPkg.Get("Error").Get("ptr"))
-	js.Global.Set("$throwRuntimeError", js.InternalObject(func(msg string) {
-		panic(errorString(msg))
-	}))
+	js.Global.Set("$throwRuntimeError", js.InternalObject(throw))
 	// avoid dead code elimination
 	var e error
 	e = &TypeAssertionError{}
@@ -199,3 +197,7 @@ func efaceOf(ep *interface{}) *eface {
 }
 
 func KeepAlive(interface{}) {}
+
+func throw(s string) {
+	panic(errorString(s))
+}
