Add comments about attribute tokens.

This clarifies something that has puzzled me for some time.

1 files changed, 2 insertions, 0 deletions

diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index bddb50568d4..dc3377f6bad 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -2786,6 +2786,7 @@ pub enum AttrKind {
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct NormalAttr {
     pub item: AttrItem,
+    // Tokens for the full attribute, e.g. `#[foo]`, `#![bar]`.
     pub tokens: Option<LazyAttrTokenStream>,
 }
 
@@ -2802,6 +2803,7 @@ impl NormalAttr {
 pub struct AttrItem {
     pub path: Path,
     pub args: AttrArgs,
+    // Tokens for the meta item, e.g. just the `foo` within `#[foo]` or `#![foo]`.
     pub tokens: Option<LazyAttrTokenStream>,
 }