Namebind can return void

TODO.md

@@ -16,4 +16,13 @@ THE BIG TODO LIST:
 - Use a smarter data structure than a HashMap for caching
 - Multi-file support
   - Grammars can be stored in `let` statement and returned from programs
-    - How do manage this arena-wise?
+    - How do manage this arena-wise?
+
+
+"I found a FnConstruct with two more argument a, b"
+Events are the current entries of ActionResult
+
+"Ok, call this function on a, and this function on b please"
+"When a or b is done, notify me"
+
+Vars no longer needs to be in PR then

prism-parser/src/parser/parser_rule_expr.rs

@@ -190,10 +190,12 @@ pub fn parser_expr<'a, 'arn: 'a, 'grm: 'arn, E: ParseError<L = ErrorLabel<'grm>>
             RuleExpr::NameBind(name, sub) => {
                 let res = parser_expr(rules, block_ctx, sub, vars).parse(pos, state, context);
                 res.map(|mut res| {
-                    res.free = res
-                        .free
-                        .insert(name, VarMapValue::Value(res.rtrn), state.alloc);
-                    res
+                    PR {
+                        free: res
+                            .free
+                            .insert(name, VarMapValue::Value(res.rtrn), state.alloc),
+                        rtrn: ActionResult::VOID,
+                    }
                 })
             }
             RuleExpr::Action(sub, action) => {