Standardize on tt name for tokens
diff --git a/src/expr.rs b/src/expr.rs
index 6578aff..55c2e4f 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -2032,7 +2032,7 @@
             mac: Macro {
                 path: what,
                 bang_token: bang,
-                tokens: proc_macro2::TokenTree {
+                tt: proc_macro2::TokenTree {
                     span: (data.1).0,
                     kind: TokenNode::Group(Delimiter::Brace, data.0),
                 },