From 3dbabe5355aeb6b4f61dfa8bdae95b6593f5575c Mon Sep 17 00:00:00 2001
From: Markus Westerlind <marwes91@gmail.com>
Date: Sat, 9 Nov 2019 00:21:54 +0100
Subject: [PATCH] feat(check): Avoid propagating errors on lift_io! misuse

---
 src/lift_io.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/lift_io.rs b/src/lift_io.rs
index 17d0171d42..c601b7ac84 100644
--- a/src/lift_io.rs
+++ b/src/lift_io.rs
@@ -35,6 +35,16 @@ impl Macro for LiftIo {
         env.run(&mut symbols, &mut module);
         let typ = module.env_type_of(&EmptyEnv::default());
 
+        match *typ {
+            Type::Record(_) => (),
+            _ => {
+                return Box::new(future::err(macros::Error::message(format!(
+                    "The second argument to `lift_io!` must be a record. Found: `{}`",
+                    typ
+                ))))
+            }
+        }
+
         let span = module.span;
 
         let vm = env.vm;