From 0ed8ce096d3ae9ee4027ab4723958a021ef24194 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 19 Dec 2019 17:13:08 +0100
Subject: Touch up TokenSet a bit

---
 crates/ra_parser/src/grammar.rs                  | 2 +-
 crates/ra_parser/src/grammar/expressions/atom.rs | 2 +-
 crates/ra_parser/src/parser.rs                   | 2 +-
 crates/ra_parser/src/token_set.rs                | 8 +++-----
 4 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/crates/ra_parser/src/grammar.rs b/crates/ra_parser/src/grammar.rs
index 6e9e212b7..22f64a9f4 100644
--- a/crates/ra_parser/src/grammar.rs
+++ b/crates/ra_parser/src/grammar.rs
@@ -264,7 +264,7 @@ fn name_r(p: &mut Parser, recovery: TokenSet) {
 }
 
 fn name(p: &mut Parser) {
-    name_r(p, TokenSet::empty())
+    name_r(p, TokenSet::EMPTY)
 }
 
 fn name_ref(p: &mut Parser) {
diff --git a/crates/ra_parser/src/grammar/expressions/atom.rs b/crates/ra_parser/src/grammar/expressions/atom.rs
index 6f5545a83..4ac1d6334 100644
--- a/crates/ra_parser/src/grammar/expressions/atom.rs
+++ b/crates/ra_parser/src/grammar/expressions/atom.rs
@@ -444,7 +444,7 @@ fn match_arm(p: &mut Parser) -> BlockLike {
     // }
     attributes::outer_attributes(p);
 
-    patterns::pattern_list_r(p, TokenSet::empty());
+    patterns::pattern_list_r(p, TokenSet::EMPTY);
     if p.at(T![if]) {
         match_guard(p);
     }
diff --git a/crates/ra_parser/src/parser.rs b/crates/ra_parser/src/parser.rs
index dafd5247b..1071c46dc 100644
--- a/crates/ra_parser/src/parser.rs
+++ b/crates/ra_parser/src/parser.rs
@@ -208,7 +208,7 @@ impl<'t> Parser<'t> {
 
     /// Create an error node and consume the next token.
     pub(crate) fn err_and_bump(&mut self, message: &str) {
-        self.err_recover(message, TokenSet::empty());
+        self.err_recover(message, TokenSet::EMPTY);
     }
 
     /// Create an error node and consume the next token.
diff --git a/crates/ra_parser/src/token_set.rs b/crates/ra_parser/src/token_set.rs
index 2a6952c01..994017acf 100644
--- a/crates/ra_parser/src/token_set.rs
+++ b/crates/ra_parser/src/token_set.rs
@@ -1,4 +1,4 @@
-//! FIXME: write short doc here
+//! A bit-set of `SyntaxKind`s.
 
 use crate::SyntaxKind;
 
@@ -7,9 +7,7 @@ use crate::SyntaxKind;
 pub(crate) struct TokenSet(u128);
 
 impl TokenSet {
-    pub(crate) const fn empty() -> TokenSet {
-        TokenSet(0)
-    }
+    pub(crate) const EMPTY: TokenSet = TokenSet(0);
 
     pub(crate) const fn singleton(kind: SyntaxKind) -> TokenSet {
         TokenSet(mask(kind))
@@ -30,7 +28,7 @@ const fn mask(kind: SyntaxKind) -> u128 {
 
 #[macro_export]
 macro_rules! token_set {
-    ($($t:expr),*) => { TokenSet::empty()$(.union(TokenSet::singleton($t)))* };
+    ($($t:expr),*) => { TokenSet::EMPTY$(.union(TokenSet::singleton($t)))* };
     ($($t:expr),* ,) => { token_set!($($t),*) };
 }
 
-- 
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