2 files changed, 6 insertions, 15 deletions

diff --git a/crates/ra_tt/Cargo.toml b/crates/ra_tt/Cargo.toml
index f7230a9ca..3c45248c3 100644
--- a/crates/ra_tt/Cargo.toml
+++ b/crates/ra_tt/Cargo.toml
@@ -3,11 +3,13 @@ edition = "2018"
 name = "ra_tt"
 version = "0.1.0"
 authors = ["rust-analyzer developers"]
+license = "MIT OR Apache-2.0"
 
 [lib]
 doctest = false
 
 [dependencies]
+stdx = { path = "../stdx" }
 # ideally, `serde` should be enabled by `rust-analyzer`, but we enable it here
 # to reduce number of compilations
 smol_str = { version = "0.1.15", features = ["serde"] }
diff --git a/crates/ra_tt/src/lib.rs b/crates/ra_tt/src/lib.rs
index 342ddbe32..8faf1cc67 100644
--- a/crates/ra_tt/src/lib.rs
+++ b/crates/ra_tt/src/lib.rs
@@ -1,24 +1,13 @@
 //! `tt` crate defines a `TokenTree` data structure: this is the interface (both
 //! input and output) of macros. It closely mirrors `proc_macro` crate's
 //! `TokenTree`.
-
-macro_rules! impl_froms {
-    ($e:ident: $($v:ident), *) => {
-        $(
-            impl From<$v> for $e {
-                fn from(it: $v) -> $e {
-                    $e::$v(it)
-                }
-            }
-        )*
-    }
-}
-
 use std::{
     fmt::{self, Debug},
     panic::RefUnwindSafe,
 };
 
+use stdx::impl_from;
+
 pub use smol_str::SmolStr;
 
 /// Represents identity of the token.
@@ -41,7 +30,7 @@ pub enum TokenTree {
     Leaf(Leaf),
     Subtree(Subtree),
 }
-impl_froms!(TokenTree: Leaf, Subtree);
+impl_from!(Leaf, Subtree for TokenTree);
 
 impl TokenTree {
     pub fn empty() -> Self {
@@ -55,7 +44,7 @@ pub enum Leaf {
     Punct(Punct),
     Ident(Ident),
 }
-impl_froms!(Leaf: Literal, Punct, Ident);
+impl_from!(Literal, Punct, Ident for Leaf);
 
 #[derive(Clone, PartialEq, Eq, Hash, Default)]
 pub struct Subtree {