From b8617ace5337fb3a84457f1fa50214e34d127994 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kr=C3=BCger?=
 <45282134+UweKrueger@users.noreply.github.com>
Date: Thu, 3 Sep 2020 02:03:31 +0200
Subject: [PATCH] checker: do not allow aliases of `chan` types (#6294)

---
 vlib/v/checker/checker.v | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index f2d0ddad80..fc3e0b4710 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -269,6 +269,8 @@ pub fn (mut c Checker) type_decl(node ast.TypeDecl) {
 				orig_sym := c.table.get_type_symbol((typ_sym.info as table.Alias).parent_type)
 				c.error('type `$typ_sym.str()` is an alias, use the original alias type `$orig_sym.source_name` instead',
 					node.pos)
+			} else if typ_sym.kind == .chan {
+				c.error('aliases of `chan` types are not allowed.', node.pos)
 			}
 		}
 		ast.FnTypeDecl {