compiler: Indicate parse::Capturing #[default]

Author: workingjubilee

compiler/rustc_parse/src/parser/mod.rs

@@ -211,9 +211,10 @@ pub type ReplaceRange = (Range<u32>, Vec<(FlatToken, Spacing)>);
 /// Controls how we capture tokens. Capturing can be expensive,
 /// so we try to avoid performing capturing in cases where
 /// we will never need an `AttrTokenStream`.
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Default)]
 pub enum Capturing {
-    /// We aren't performing any capturing - this is the default mode.
+    /// We aren't performing any capturing
+    #[default]
     No,
     /// We are capturing tokens
     Yes,