From 7d61a567d554fa4ca80bd6b42c5247cc16c44776 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Wed, 2 Sep 2020 14:48:17 +0300
Subject: [PATCH] compiler: fix a bug with type conversion in switch

It was incorrectly parsed as void call.
---
 pkg/compiler/func_scope.go  |  5 +++++
 pkg/compiler/switch_test.go | 15 +++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/pkg/compiler/func_scope.go b/pkg/compiler/func_scope.go
index 2eca590fe..384e14992 100644
--- a/pkg/compiler/func_scope.go
+++ b/pkg/compiler/func_scope.go
@@ -108,6 +108,11 @@ func (c *funcScope) analyzeVoidCalls(node ast.Node) bool {
 		if ok {
 			c.voidCalls[ce] = false
 		}
+	case *ast.SwitchStmt:
+		ce, ok := n.Tag.(*ast.CallExpr)
+		if ok {
+			c.voidCalls[ce] = false
+		}
 	case *ast.CaseClause:
 		for _, e := range n.List {
 			ce, ok := e.(*ast.CallExpr)
diff --git a/pkg/compiler/switch_test.go b/pkg/compiler/switch_test.go
index ce90ee0c2..73c711b79 100644
--- a/pkg/compiler/switch_test.go
+++ b/pkg/compiler/switch_test.go
@@ -33,6 +33,21 @@ var switchTestCases = []testCase{
 		}`,
 		big.NewInt(2),
 	},
+	{
+		"type conversion in tag",
+		`package main
+		type state int
+		func Main() int {
+			a := 1
+			switch state(a) {
+			case 1:
+				return 42
+			default:
+				return 11
+			}
+		}`,
+		big.NewInt(42),
+	},
 	{
 		"simple switch fail",
 		`package main