From 710826e37e9fc2627e1c4ea2746645d1befb7b89 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Mon, 11 Feb 2019 09:46:02 -0800
Subject: [PATCH] Add regression test

---
 .../types/rest/restTuplesFromContextualTypes.ts    | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts b/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts
index 84bf81195b0..d5623a000a2 100644
--- a/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts
+++ b/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts
@@ -70,3 +70,17 @@ declare function take(cb: (a: number, b: string) => void): void;
 
 (function foo(...rest){}(1, ''));
 take(function(...rest){});
+
+// Repro from #29833
+
+type ArgsUnion = [number, string] | [number, Error];
+type TupleUnionFunc = (...params: ArgsUnion) => number;
+
+const funcUnionTupleNoRest: TupleUnionFunc = (num, strOrErr) => {
+  return num;
+};
+
+const funcUnionTupleRest: TupleUnionFunc = (...params) => {
+  const [num, strOrErr] = params;
+  return num;
+};