cleanup

src/parser.zig

@@ -169,6 +169,16 @@ pub const Parser = struct {
 
         // Otherwise it's a constant expression
         const value = try self.parseExpr();
+
+        // name :: type_expr #builtin; — builtin with type annotation
+        if (self.current.tag == .hash_builtin) {
+            const bi_start = self.current.loc.start;
+            self.advance();
+            try self.expect(.semicolon);
+            const bi = try self.createNode(bi_start, .{ .builtin_expr = {} });
+            return try self.createNode(start_pos, .{ .const_decl = .{ .name = name, .type_annotation = value, .value = bi } });
+        }
+
         try self.expect(.semicolon);
         return try self.createNode(start_pos, .{ .const_decl = .{ .name = name, .type_annotation = null, .value = value } });
     }