full rewrite, kinda works

mers_lib/src/program/run/chain.rs

@@ -0,0 +1,26 @@
+use std::{any::Any, sync::Arc};
+
+use crate::data::{function::Function, Data};
+
+use super::MersStatement;
+
+#[derive(Debug)]
+pub struct Chain {
+    pub first: Box<dyn MersStatement>,
+    pub chained: Box<dyn MersStatement>,
+}
+impl MersStatement for Chain {
+    fn run_custom(&self, info: &mut super::Info) -> Data {
+        let f = self.first.run(info);
+        let c = self.chained.run(info);
+        let c = c.get();
+        if let Some(func) = c.as_any().downcast_ref::<crate::data::function::Function>() {
+            func.run(f)
+        } else {
+            todo!("err: not a function");
+        }
+    }
+    fn has_scope(&self) -> bool {
+        false
+    }
+}