Merge pull request #326 from dtolnay/arc

ToTokens for Arc

Author: dtolnay

src/to_tokens.rs

@@ -1,4 +1,5 @@
 use super::TokenStreamExt;
+use std::sync::Arc;
 use alloc::borrow::{Cow, ToOwned};
 use alloc::boxed::Box;
 use alloc::ffi::CString;
@@ -104,6 +105,12 @@ impl<T: ?Sized + ToTokens> ToTokens for Rc<T> {
     }
 }
 
+impl<T: ?Sized + ToTokens> ToTokens for Arc<T> {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        (**self).to_tokens(tokens);
+    }
+}
+
 impl<T: ToTokens> ToTokens for Option<T> {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         if let Some(t) = self {

tests/ui/not-quotable.stderr

@@ -10,11 +10,11 @@ error[E0277]: the trait bound `Ipv4Addr: ToTokens` is not satisfied
   = help: the following other types implement trait `ToTokens`:
             &T
             &mut T
+            Arc<T>
             Box<T>
             CStr
             CString
             Cow<'a, T>
             Option<T>
-            Rc<T>
           and $N others
   = note: this error originates in the macro `quote` (in Nightly builds, run with -Z macro-backtrace for more info)