From a0b8b818f3901460ad7f93e1ed48779431a12583 Mon Sep 17 00:00:00 2001
From: Jacek Sieka <jacek@status.im>
Date: Fri, 29 May 2020 16:37:59 +0200
Subject: [PATCH] work around type issues

---
 beacon_chain/ssz/types.nim | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/beacon_chain/ssz/types.nim b/beacon_chain/ssz/types.nim
index a58ec6044..672e2afd5 100644
--- a/beacon_chain/ssz/types.nim
+++ b/beacon_chain/ssz/types.nim
@@ -236,18 +236,21 @@ macro unsupported*(T: typed): untyped =
   # File both problems as issues.
   error "SSZ serialization of the type " & humaneTypeName(T) & " is not supported"
 
-template ElemType*(T: type[HashArray]): untyped =
-  type(default(T).data[0])
+template ElemType*(T: type HashArray): untyped =
+  T.T
 
-template ElemType*(T: type[HashList]): untyped =
-  type(default(T).data[0])
+template ElemType*(T: type HashList): untyped =
+  T.T
 
-template ElemType*(T: type[array]): untyped =
+template ElemType*(T: type array): untyped =
   type(default(T)[low(T)])
 
-template ElemType*(T: type[seq|List]): untyped =
+template ElemType*(T: type seq): untyped =
   type(default(T)[0])
 
+template ElemType*(T: type List): untyped =
+  T.T
+
 func isFixedSize*(T0: type): bool {.compileTime.} =
   mixin toSszType, enumAllSerializedFields