Rollup merge of #41957 - llogiq:clippy-libsyntax, r=petrochenkov

Fix some clippy warnings in libsyntax

This is mostly removing stray ampersands, needless returns and lifetimes. Basically a lot of small changes.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libsyntax/json.rs b/src/libsyntax/json.rs
index 06335584c96..f37dcfdde89 100644
--- a/src/libsyntax/json.rs
+++ b/src/libsyntax/json.rs
@@ -337,7 +337,7 @@ impl DiagnosticSpanLine {
                       })
                      .collect()
              })
-            .unwrap_or(vec![])
+            .unwrap_or_else(|_| vec![])
     }
 }