From c298b613755ee4bb13290386b84f2e87cb44f46b Mon Sep 17 00:00:00 2001
From: Jaco Greeff <jacogr@gmail.com>
Date: Sat, 9 May 2020 13:44:40 +0200
Subject: [PATCH] Expose BlockHashCount on system metadata constants (#5960)

---
 substrate/frame/system/src/lib.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/substrate/frame/system/src/lib.rs b/substrate/frame/system/src/lib.rs
index 8346b727b2..7219b0f518 100644
--- a/substrate/frame/system/src/lib.rs
+++ b/substrate/frame/system/src/lib.rs
@@ -481,6 +481,9 @@ decl_module! {
 	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
 		type Error = Error<T>;
 
+		/// The maximum number of blocks to allow in mortal eras.
+		const BlockHashCount: T::BlockNumber = T::BlockHashCount::get();
+
 		/// The maximum weight of a block.
 		const MaximumBlockWeight: Weight = T::MaximumBlockWeight::get();