From ef702b77dc6484b8869a4f51626489897efe369e Mon Sep 17 00:00:00 2001
From: Sergey Pepyakin <s.pepyakin@gmail.com>
Date: Sun, 26 Nov 2017 23:18:58 +0300
Subject: [PATCH] WASM Remove blockhash error (#7121)

* Remove blockhash error

* Update tests.
---
 ethcore/res/wasm-tests      | 2 +-
 ethcore/wasm/src/env.rs     | 2 +-
 ethcore/wasm/src/runtime.rs | 2 +-
 ethcore/wasm/src/tests.rs   | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/ethcore/res/wasm-tests b/ethcore/res/wasm-tests
index e5fcae4e9..d6185ea16 160000
--- a/ethcore/res/wasm-tests
+++ b/ethcore/res/wasm-tests
@@ -1 +1 @@
-Subproject commit e5fcae4e9c2a570f293a22baa4d78d9f4b391a0f
+Subproject commit d6185ea16eaba7ff685c069c2064819f9549c4d7
diff --git a/ethcore/wasm/src/env.rs b/ethcore/wasm/src/env.rs
index 1004f3526..ed4bda68b 100644
--- a/ethcore/wasm/src/env.rs
+++ b/ethcore/wasm/src/env.rs
@@ -115,7 +115,7 @@ pub const SIGNATURES: &'static [UserFunctionDescriptor] = &[
 	Static(
 		"_blockhash",
 		&[I64, I32],
-		Some(I32),
+		None,
 	),
 	Static(
 		"_coinbase",
diff --git a/ethcore/wasm/src/runtime.rs b/ethcore/wasm/src/runtime.rs
index 0782876b5..bad325fbf 100644
--- a/ethcore/wasm/src/runtime.rs
+++ b/ethcore/wasm/src/runtime.rs
@@ -665,7 +665,7 @@ impl<'a, 'b> Runtime<'a, 'b> {
 
 		self.memory.set(return_ptr, &*hash)?;
 
-		Ok(Some(0i32.into()))
+		Ok(None)
 	}
 
 	fn return_address_ptr(&mut self, ptr: u32, val: Address) -> Result<(), InterpreterError>
diff --git a/ethcore/wasm/src/tests.rs b/ethcore/wasm/src/tests.rs
index f5738871b..a387f9292 100644
--- a/ethcore/wasm/src/tests.rs
+++ b/ethcore/wasm/src/tests.rs
@@ -765,7 +765,7 @@ fn externs() {
 		"Gas limit requested and returned does not match"
 	);
 
-	assert_eq!(gas_left, U256::from(94_733));
+	assert_eq!(gas_left, U256::from(94_858));
 }
 
 #[test]