libproc_macro: Implement Drop for TokenStream

TokenStream did not have any drop implementation, the memory could not
have been freed correctly.

ChangeLog:

	* libgrust/libproc_macro/rust/bridge/token_stream.rs: Implement
	drop.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/libgrust/libproc_macro/rust/bridge/token_stream.rs b/libgrust/libproc_macro/rust/bridge/token_stream.rs
index 56f6679a822..79f161fce44 100644
--- a/libgrust/libproc_macro/rust/bridge/token_stream.rs
+++ b/libgrust/libproc_macro/rust/bridge/token_stream.rs
@@ -15,6 +15,7 @@ extern "C" {
     fn TokenStream__push(stream: *mut TokenStream, tree: TokenTree);
     fn TokenStream__from_string(str: *const c_uchar, len: u64, ts: *mut TokenStream) -> bool;
     fn TokenStream__clone(ts: *const TokenStream) -> TokenStream;
+    fn TokenStream__drop(stream: *mut TokenStream);
 }
 
 #[repr(C)]
@@ -154,3 +155,9 @@ impl Clone for TokenStream {
         unsafe { TokenStream__clone(self as *const TokenStream) }
     }
 }
+
+impl Drop for TokenStream {
+    fn drop(&mut self) {
+        unsafe { TokenStream__drop(self as *mut TokenStream) }
+    }
+}