make token set a const-fn

1 files changed, 21 insertions, 24 deletions

diff --git a/crates/ra_syntax/src/grammar/expressions/atom.rs b/crates/ra_syntax/src/grammar/expressions/atom.rs
index 31b09ac5b..167a76551 100644
--- a/crates/ra_syntax/src/grammar/expressions/atom.rs
+++ b/crates/ra_syntax/src/grammar/expressions/atom.rs
@@ -36,29 +36,26 @@ pub(crate) fn literal(p: &mut Parser) -> Option<CompletedMarker> {
 }
 
 // E.g. for after the break in `if break {}`, this should not match
-pub(super) const ATOM_EXPR_FIRST: TokenSet = token_set_union![
-    LITERAL_FIRST,
-    token_set![
-        L_PAREN,
-        L_CURLY,
-        L_BRACK,
-        PIPE,
-        MOVE_KW,
-        IF_KW,
-        WHILE_KW,
-        MATCH_KW,
-        UNSAFE_KW,
-        RETURN_KW,
-        IDENT,
-        SELF_KW,
-        SUPER_KW,
-        CRATE_KW,
-        COLONCOLON,
-        BREAK_KW,
-        CONTINUE_KW,
-        LIFETIME
-    ],
-];
+pub(super) const ATOM_EXPR_FIRST: TokenSet = LITERAL_FIRST.union(token_set![
+    L_PAREN,
+    L_CURLY,
+    L_BRACK,
+    PIPE,
+    MOVE_KW,
+    IF_KW,
+    WHILE_KW,
+    MATCH_KW,
+    UNSAFE_KW,
+    RETURN_KW,
+    IDENT,
+    SELF_KW,
+    SUPER_KW,
+    CRATE_KW,
+    COLONCOLON,
+    BREAK_KW,
+    CONTINUE_KW,
+    LIFETIME,
+]);
 
 const EXPR_RECOVERY_SET: TokenSet = token_set![LET_KW];
 
@@ -363,7 +360,7 @@ pub(crate) fn match_arm_list(p: &mut Parser) {
 fn match_arm(p: &mut Parser) -> BlockLike {
     let m = p.start();
     p.eat(PIPE);
-    patterns::pattern_r(p, TokenSet::EMPTY);
+    patterns::pattern_r(p, TokenSet::empty());
     while p.eat(PIPE) {
         patterns::pattern(p);
     }