From 724a2c18360626b29c99a274c2aa0c59caafeeb6 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adam@chlipala.net>
Date: Sat, 21 Apr 2012 14:06:03 -0400
Subject: Add another rule to simplify record concatenations for
 pretty-printing

---
 src/elab_ops.sml  | 3 ++-
 tests/simplify.ur | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 tests/simplify.ur

diff --git a/src/elab_ops.sml b/src/elab_ops.sml
index dbefbe7d..1546feef 100644
--- a/src/elab_ops.sml
+++ b/src/elab_ops.sml
@@ -1,4 +1,4 @@
-(* Copyright (c) 2008, Adam Chlipala
+(* Copyright (c) 2008, 2012, Adam Chlipala
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -482,6 +482,7 @@ fun reduceCon env (cAll as (c, loc)) =
               | ((CRecord (_, []), _), _) => c2
               | ((CConcat (c11, c12), loc), _) => reduceCon env (CConcat (c11, (CConcat (c12, c2), loc)), loc)
               | (_, (CRecord (_, []), _)) => c1
+              | ((CRecord (k, xcs1), loc), (CConcat ((CRecord (_, xcs2), _), c2'), _)) => (CConcat ((CRecord (k, xcs1 @ xcs2), loc), c2'), loc)
               | _ => (CConcat (c1, c2), loc)
         end
       | CMap _ => cAll
diff --git a/tests/simplify.ur b/tests/simplify.ur
new file mode 100644
index 00000000..11e002eb
--- /dev/null
+++ b/tests/simplify.ur
@@ -0,0 +1 @@
+fun main [r] (r : $([A = int] ++ ([B = float] ++ r))) : $([A = float] ++ ([B = int] ++ r)) = r
-- 
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