From 9ba3d8113b31e06f751bad05432aeb7c882bdb4d Mon Sep 17 00:00:00 2001
From: Shuhei Kadowaki <aviatesk@gmail.com>
Date: Thu, 11 Feb 2021 14:29:09 +0900
Subject: [PATCH] apply suggestion

---
 base/essentials.jl | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/base/essentials.jl b/base/essentials.jl
index c99eaa66eb77bd..4c7e68a7e6ac69 100644
--- a/base/essentials.jl
+++ b/base/essentials.jl
@@ -257,10 +257,14 @@ end
 
 function rewrap_unionall(t::Core.TypeofVararg, @nospecialize(u))
     isdefined(t, :T) || return t
-    if !isdefined(t, :N) || (isa(u, UnionAll) && t.N === u.var)
-        return Vararg{rewrap_unionall(t.T, u)}
+    if !isa(u, UnionAll)
+        return t
+    end
+    T = rewrap_unionall(t.T, u)
+    if !isdefined(t, :N) || t.N === u.var
+        return Vararg{T}
     end
-    Vararg{rewrap_unionall(t.T, u), t.N}
+    return Vararg{T, t.N}
 end
 
 # replace TypeVars in all enclosing UnionAlls with fresh TypeVars