Add a simple API to reject promises with DOM error values.

1 files changed, 10 insertions, 1 deletions

diff --git a/components/script/dom/promise.rs b/components/script/dom/promise.rs
index 6dd45d05219..f167d95bfd2 100644
--- a/components/script/dom/promise.rs
+++ b/components/script/dom/promise.rs
@@ -14,7 +14,7 @@
 use dom::bindings::callback::CallbackContainer;
 use dom::bindings::codegen::Bindings::PromiseBinding::AnyCallback;
 use dom::bindings::conversions::root_from_object;
-use dom::bindings::error::Fallible;
+use dom::bindings::error::{Error, Fallible};
 use dom::bindings::global::GlobalRef;
 use dom::bindings::js::MutHeapJSVal;
 use dom::bindings::reflector::{Reflectable, MutReflectable, Reflector};
@@ -156,6 +156,15 @@ impl Promise {
         self.maybe_reject(cx, v.handle());
     }
 
+    #[allow(unsafe_code)]
+    pub fn maybe_reject_error(&self, cx: *mut JSContext, error: Error) {
+        rooted!(in(cx) let mut v = UndefinedValue());
+        unsafe {
+            error.maybe_to_jsval(cx, self.global().r(), v.handle_mut());
+        }
+        self.maybe_reject(cx, v.handle());
+    }
+
     #[allow(unrooted_must_root, unsafe_code)]
     pub fn maybe_reject(&self,
                         cx: *mut JSContext,