Rollup merge of #72234 - dtolnay:default, r=petrochenkov

Implement Default for proc_macro::TokenStream

Hopefully this is uncontroversial. The only reason we've made it this far without is that proc-macro2 snuck this in for their TokenStream.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index 31bc61263ab..b6544341fa9 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -158,6 +158,13 @@ impl fmt::Debug for TokenStream {
     }
 }
 
+#[stable(feature = "proc_macro_token_stream_default", since = "1.45.0")]
+impl Default for TokenStream {
+    fn default() -> Self {
+        TokenStream::new()
+    }
+}
+
 #[unstable(feature = "proc_macro_quote", issue = "54722")]
 pub use quote::{quote, quote_span};