From 3e564a2506572db60288a388daabdd913e3d692c Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 20 Nov 2019 18:19:13 +0300
Subject: [PATCH] parser: fix register() bug in interfaces

---
 vlib/compiler/struct.v               |  2 +-
 vlib/compiler/tests/interface_test.v | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/vlib/compiler/struct.v b/vlib/compiler/struct.v
index 1428efa29c..c7b4a3b5a9 100644
--- a/vlib/compiler/struct.v
+++ b/vlib/compiler/struct.v
@@ -166,7 +166,7 @@ fn (p mut Parser) struct_decl() {
 		// }
 		// Check if reserved name
 		field_name_token_idx := p.cur_tok_index()
-		field_name := if name != 'Option' { p.table.var_cgen_name(p.check_name()) } else { p.check_name() }
+		field_name := if name != 'Option' && !is_interface { p.table.var_cgen_name(p.check_name()) } else { p.check_name() }
 		/*
 		if !p.first_pass() {
 			p.fgen(strings.repeat(` `, fmt_max_len - field_name.len))
diff --git a/vlib/compiler/tests/interface_test.v b/vlib/compiler/tests/interface_test.v
index c37c325058..50af93267b 100644
--- a/vlib/compiler/tests/interface_test.v
+++ b/vlib/compiler/tests/interface_test.v
@@ -53,3 +53,23 @@ fn test_perform_speak() {
 
 }
 
+interface Register {
+	register()
+}
+
+struct RegTest {a int}
+
+fn (f RegTest) register() {
+}
+
+fn handle_reg(r Register) {
+}
+
+fn test_register() {
+	f := RegTest{}
+	f.register()
+	handle_reg(f)
+}
+
+
+