minor: cleanup const parsing

Author: matklad

crates/parser/src/grammar/items/consts.rs

@@ -1,20 +1,20 @@
 use super::*;
 
-pub(super) fn static_(p: &mut Parser, m: Marker) {
-    const_or_static(p, m, T![static], STATIC)
+pub(super) fn konst(p: &mut Parser, m: Marker) {
+    p.bump(T![const]);
+    const_or_static(p, m, true)
 }
 
-pub(super) fn konst(p: &mut Parser, m: Marker) {
-    const_or_static(p, m, T![const], CONST)
+pub(super) fn static_(p: &mut Parser, m: Marker) {
+    p.bump(T![static]);
+    const_or_static(p, m, false)
 }
 
-fn const_or_static(p: &mut Parser, m: Marker, kw: SyntaxKind, def: SyntaxKind) {
-    assert!(p.at(kw));
-    p.bump(kw);
+fn const_or_static(p: &mut Parser, m: Marker, is_const: bool) {
     p.eat(T![mut]);
 
     // Allow `_` in place of an identifier in a `const`.
-    let is_const_underscore = kw == T![const] && p.eat(T![_]);
+    let is_const_underscore = is_const && p.eat(T![_]);
     if !is_const_underscore {
         name(p);
     }
@@ -30,5 +30,5 @@ fn const_or_static(p: &mut Parser, m: Marker, kw: SyntaxKind, def: SyntaxKind) {
         expressions::expr(p);
     }
     p.expect(T![;]);
-    m.complete(p, def);
+    m.complete(p, if is_const { CONST } else { STATIC });
 }