diff --git a/src/expr.rs b/src/expr.rs
index bb0f6ba..b33c817 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -3,9 +3,7 @@ use proc_macro::token_stream::IntoIter as TokenIter;
 use proc_macro::{Spacing, Span, TokenStream, TokenTree};
 use std::iter;
 
-pub struct Expr(TokenStream);
-
-pub fn parse(input: &mut TokenIter) -> Result<Expr> {
+pub fn parse(input: &mut TokenIter) -> Result<TokenStream> {
     #[derive(PartialEq)]
     enum Lookbehind {
         JointColon,
@@ -25,7 +23,7 @@ pub fn parse(input: &mut TokenIter) -> Result<Expr> {
                 let spacing = punct.spacing();
                 expr.extend(iter::once(TokenTree::Punct(punct)));
                 lookbehind = match ch {
-                    ',' if angle_bracket_depth == 0 => return Ok(Expr(expr)),
+                    ',' if angle_bracket_depth == 0 => return Ok(expr),
                     ':' if lookbehind == Lookbehind::JointColon => Lookbehind::DoubleColon,
                     ':' if spacing == Spacing::Joint => Lookbehind::JointColon,
                     '<' if lookbehind == Lookbehind::DoubleColon => {
@@ -50,9 +48,3 @@ pub fn parse(input: &mut TokenIter) -> Result<Expr> {
         }
     }
 }
-
-impl Expr {
-    pub fn into_tokens(self) -> TokenStream {
-        self.0
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
index 2056292..a10066f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -121,7 +121,6 @@ mod expr;
 mod unindent;
 
 use crate::error::{Error, Result};
-use crate::expr::Expr;
 use crate::unindent::unindent;
 use proc_macro::token_stream::IntoIter as TokenIter;
 use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
@@ -320,7 +319,7 @@ fn try_expand(input: TokenStream, mode: Macro) -> Result<TokenStream> {
         TokenTree::Group(Group::new(
             Delimiter::Brace,
             prefix
-                .map_or_else(TokenStream::new, Expr::into_tokens)
+                .unwrap_or_else(TokenStream::new)
                 .into_iter()
                 .chain(iter::once(TokenTree::Literal(unindented_lit)))
                 .chain(input)