From 5fb3c0e3a8a5ff1742cf0f7240a87728fc55f0b8 Mon Sep 17 00:00:00 2001
From: joe-conigliaro <joe-conigliaro@users.noreply.github.com>
Date: Mon, 30 Sep 2019 20:41:11 +1000
Subject: [PATCH] compiler: add error when embedding struct in itself

---
 compiler/parser.v | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler/parser.v b/compiler/parser.v
index 3415e76893..12422a62f4 100644
--- a/compiler/parser.v
+++ b/compiler/parser.v
@@ -722,6 +722,7 @@ fn (p mut Parser) struct_decl() {
 		// p.next()
 		// }
 		// 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() }
 		// Check dups
 		if field_name in names {
@@ -744,6 +745,9 @@ fn (p mut Parser) struct_decl() {
 		access_mod := if is_pub{AccessMod.public} else { AccessMod.private}
 		p.fgen(' ')
 		field_type := p.get_type()
+		if field_type == name {
+			p.error_with_token_index( 'cannot embed struct `$name` in itself (field `$field_name`)', field_name_token_idx)
+		}
 		p.check_and_register_used_imported_type(field_type)
 		is_atomic := p.tok == .key_atomic
 		if is_atomic {