[WIP] Implement parsing for lambdas + start implementing call

src/vm/commands/indent.ts

@@ -7,10 +7,10 @@ export type IndentData = {
 }
 
 export class Indent extends Command<IndentData> {
-    attemptParse(context: ParseContext): IndentData {
+    async attemptParse(context: ParseContext): Promise<IndentData> {
         return {
             type: context.popKeywordInSet(['space', 'tab']).value,
-            level: context.popOptionalTerm(),
+            level: await context.popOptionalTerm(),
         }
     }