Some clippy fixes

crates/ra_mbe/src/syntax_bridge.rs

@@ -383,7 +383,7 @@ mod tests {
             "#,
         );
         let expansion = expand(&rules, "literals!(foo);");
-        let tts = &[expansion.clone().into()];
+        let tts = &[expansion.into()];
         let buffer = tt::buffer::TokenBuffer::new(tts);
         let mut tt_src = SubtreeTokenSource::new(&buffer);
         let mut tokens = vec![];