From 962bbf1c607176781f50bd6d5f28c000bb9b485d Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Wed, 3 Jun 2020 23:45:40 +0800
Subject: [PATCH] fmt: fix ?void format error, add _keep.vv test

---
 vlib/v/fmt/tests/void_optional_keep.vv | 9 +++++++++
 vlib/v/table/atypes.v                  | 6 +++++-
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/fmt/tests/void_optional_keep.vv

diff --git a/vlib/v/fmt/tests/void_optional_keep.vv b/vlib/v/fmt/tests/void_optional_keep.vv
new file mode 100644
index 0000000000..32cb28ea76
--- /dev/null
+++ b/vlib/v/fmt/tests/void_optional_keep.vv
@@ -0,0 +1,9 @@
+fn tt() ? {
+	return error('error')
+}
+
+fn main() {
+	tt() or {
+		panic('$err')
+	}
+}
diff --git a/vlib/v/table/atypes.v b/vlib/v/table/atypes.v
index 2debd28297..7d350791c1 100644
--- a/vlib/v/table/atypes.v
+++ b/vlib/v/table/atypes.v
@@ -707,7 +707,11 @@ pub fn (table &Table) type_to_str(t Type) string {
 		res = strings.repeat(`&`, nr_muls) + res
 	}
 	if t.flag_is(.optional) {
-		res = '?' + res
+		if sym.kind == .void {
+			res = '?'
+		} else {
+			res = '?' + res
+		}
 	}
 	/*
 	if res.starts_with(cur_mod +'.') {