From 61b2ac7fb35c2a8aca703d5a5f9a9a8f28def977 Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Thu, 11 Apr 2019 17:07:25 +0200
Subject: Be more civilized when typecheck case unimplemented

---
 dhall/src/typecheck.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dhall/src/typecheck.rs b/dhall/src/typecheck.rs
index cab734e..94a86e1 100644
--- a/dhall/src/typecheck.rs
+++ b/dhall/src/typecheck.rs
@@ -565,7 +565,7 @@ pub fn type_with(
                     NaturalPlus => dhall::subexpr!(Natural),
                     NaturalTimes => dhall::subexpr!(Natural),
                     TextAppend => dhall::subexpr!(Text),
-                    _ => panic!("Unimplemented typecheck case: {:?}", e),
+                    _ => Err(mkerr(Unimplemented))?,
                 });
 
                 ensure_equal!(
@@ -583,7 +583,7 @@ pub fn type_with(
                 Ok(RetType(t))
             }
             Embed(p) => match p {},
-            _ => panic!("Unimplemented typecheck case: {:?}", e),
+            _ => Err(mkerr(Unimplemented))?,
         },
     }?;
     match ret {
@@ -629,6 +629,7 @@ pub enum TypeMessage<S> {
     NoDependentLet(Normalized, Normalized),
     NoDependentTypes(Normalized, Normalized),
     MustCombineARecord(SubExpr<S, X>, SubExpr<S, X>),
+    Unimplemented,
 }
 
 /// A structured type error that includes context
-- 
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