From 43912b9ee07d7abfdf701b5c504a27cc71011f13 Mon Sep 17 00:00:00 2001
From: Michael Abbott <32575566+mcabbott@users.noreply.github.com>
Date: Sat, 8 Oct 2022 22:35:21 -0400
Subject: [PATCH] fix 1.6

---
 src/functor.jl | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/functor.jl b/src/functor.jl
index 91c0301..2612b59 100644
--- a/src/functor.jl
+++ b/src/functor.jl
@@ -151,10 +151,13 @@ end
 ###
 
 if VERSION < v"1.7"
-  # Copied verbatim from Base, except omitting the macro:
-  function ismutabletype(@nospecialize t)
-      # @_total_meta  
-      t = unwrap_unionall(t)
-      return isa(t, DataType) && t.name.flags & 0x2 == 0x2
-  end
+  # # Copied verbatim from Base, except omitting the macro:
+  # function ismutabletype(@nospecialize t)
+  #     # @_total_meta
+  #     t = Base.unwrap_unionall(t)
+  #     return isa(t, DataType) && t.name.flags & 0x2 == 0x2
+  # end
+  
+  # That doesn't work, but this does:
+  ismutabletype(@nospecialize t) = t.mutable
 end