[gcc r14-7509] gccrs: libproc_macro: Implement Drop for TokenStream

[Arthur Cohen]

https://gcc.gnu.org/g:98b779a83cbbbe87e2aad76d230b6c8674645943

commit r14-7509-g98b779a83cbbbe87e2aad76d230b6c8674645943
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Wed Apr 12 18:07:08 2023 +0200

    gccrs: libproc_macro: Implement Drop for TokenStream
    
    TokenStream did not have any drop implementation, the memory could not
    have been freed correctly.
    
    libgrust/ChangeLog:
    
            * libproc_macro/rust/bridge/token_stream.rs: Implement
            drop.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 libgrust/libproc_macro/rust/bridge/token_stream.rs | 7 +++++++
 1 file changed, 7 insertions(+)

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) }
+    }
+}