From db162df264a222021dbc7f1f93af94029f3948d9 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Fri, 27 Mar 2020 00:41:44 +0800
Subject: Remove deps on tt_mbe

---
 crates/ra_tt/src/lib.rs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'crates/ra_tt')

diff --git a/crates/ra_tt/src/lib.rs b/crates/ra_tt/src/lib.rs
index 1e2fb8b91..1015ce0a6 100644
--- a/crates/ra_tt/src/lib.rs
+++ b/crates/ra_tt/src/lib.rs
@@ -14,9 +14,12 @@ macro_rules! impl_froms {
     }
 }
 
-use std::fmt;
+use std::{
+    fmt::{self, Debug},
+    panic::RefUnwindSafe,
+};
 
-use smol_str::SmolStr;
+pub use smol_str::SmolStr;
 
 /// Represents identity of the token.
 ///
@@ -184,3 +187,11 @@ impl Subtree {
 }
 
 pub mod buffer;
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum ExpansionError {}
+
+pub trait TokenExpander: Debug + Send + Sync + RefUnwindSafe {
+    fn expand(&self, subtree: &Subtree, attrs: Option<&Subtree>)
+        -> Result<Subtree, ExpansionError>;
+}
-- 
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