From 112c652ace1f87015b12c672cbfbf28c65eb6ac8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kr=C3=BCger?=
 <45282134+UweKrueger@users.noreply.github.com>
Date: Thu, 4 Feb 2021 00:07:20 +0100
Subject: [PATCH] cgen: auto initialize `chan` that are struct elements (#8541)

---
 vlib/sync/struct_chan_init_test.v | 14 ++++++++++++++
 vlib/v/gen/c/cgen.v               |  4 ++++
 2 files changed, 18 insertions(+)
 create mode 100644 vlib/sync/struct_chan_init_test.v

diff --git a/vlib/sync/struct_chan_init_test.v b/vlib/sync/struct_chan_init_test.v
new file mode 100644
index 0000000000..a51ea4b6d5
--- /dev/null
+++ b/vlib/sync/struct_chan_init_test.v
@@ -0,0 +1,14 @@
+struct Abc {
+	ch chan int
+}
+
+fn f(st Abc) {
+	st.ch <- 47
+}
+
+fn test_chan_init() {
+	st := Abc{}
+	go f(st)
+	i := <-st.ch
+	assert i == 47
+}
diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index f61ae071c8..2983e23427 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -5732,6 +5732,10 @@ fn (mut g Gen) type_default(typ_ table.Type) string {
 		'rune' { return '0' }
 		else {}
 	}
+	if sym.kind == .chan {
+		elemtypstr := g.typ(sym.chan_info().elem_type)
+		return 'sync__new_channel_st(0, sizeof($elemtypstr))'
+	}
 	return match sym.kind {
 		.interface_, .sum_type, .array_fixed, .multi_return { '{0}' }
 		.alias { g.type_default((sym.info as table.Alias).parent_type) }