From 4b43e282fcdbfe1420c77978a916b7bc86256dbd Mon Sep 17 00:00:00 2001
From: Matus Talcik <matus.talcik@outlook.com>
Date: Thu, 29 Oct 2020 15:43:12 +0100
Subject: [PATCH] spv-in: fix flowgraph (#247)

Header blocks were incorrectly overwritten.
format
---
 src/front/spv/flow.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/front/spv/flow.rs b/src/front/spv/flow.rs
index 526ec1ac7c..a1c746701b 100644
--- a/src/front/spv/flow.rs
+++ b/src/front/spv/flow.rs
@@ -152,6 +152,12 @@ impl FlowGraph {
             let (node_source_index, node_target_index) =
                 self.flow.edge_endpoints(edge_index).unwrap();
 
+            if self.flow[node_source_index].ty == Some(ControlFlowNodeType::Header)
+                || self.flow[node_source_index].ty == Some(ControlFlowNodeType::Loop)
+            {
+                continue;
+            }
+
             // Back
             if self.flow[node_target_index].ty == Some(ControlFlowNodeType::Loop)
                 && self.flow[node_source_index].id > self.flow[node_target_index].id