namespacing the store functions. allowing _ in params

src/parser.ts

@@ -279,9 +279,13 @@ export class Parser {
         const token = this.current();
         const params: string[] = [];
 
-        while (this.current().kind === 'ident') {
+        while (this.current().kind === 'ident' || this.current().kind === 'underscore') {
             const param = this.advance();
-            params.push((param as { value: string }).value);
+            if (param.kind === 'underscore') {
+                params.push('_');
+            } else {
+                params.push((param as { value: string }).value);
+            }
         }
 
         this.expect('backslash');