From: Dale Weiler <weilercdale@gmail.com>
Date: Thu, 8 Jul 2021 03:11:17 +0000 (-0400)
Subject: allow comparing explicitly against nil
X-Git-Tag: xonotic-v0.8.5~3
X-Git-Url: http://git.xonotic.org/?p=xonotic%2Fgmqcc.git;a=commitdiff_plain;h=6cf25c0ec6196fbae7c713108a1c45764a080861

allow comparing explicitly against nil
---

diff --git a/parser.cpp b/parser.cpp
index 0ca7843..8aa49f7 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -897,7 +897,11 @@ static bool parser_sy_apply_operator(parser_t *parser, shunt *sy)
                 out = fold::binary(ctx, generated_op, exprs[0], exprs[1]);
             break;
         case opid2('!', '='):
-            if (exprs[0]->m_vtype != exprs[1]->m_vtype) {
+            #define NotComparable \
+                exprs[0]->m_vtype != TYPE_NIL && \
+                exprs[1]->m_vtype != TYPE_NIL && \
+                exprs[0]->m_vtype != exprs[1]->m_vtype
+            if (NotComparable) {
                 compile_error(ctx, "invalid types used in expression: cannot perform comparison between types %s and %s",
                               type_name[exprs[0]->m_vtype],
                               type_name[exprs[1]->m_vtype]);
@@ -907,7 +911,7 @@ static bool parser_sy_apply_operator(parser_t *parser, shunt *sy)
                 out = fold::binary(ctx, type_ne_instr[exprs[0]->m_vtype], exprs[0], exprs[1]);
             break;
         case opid2('=', '='):
-            if (exprs[0]->m_vtype != exprs[1]->m_vtype) {
+            if (NotComparable) {
                 compile_error(ctx, "invalid types used in expression: cannot perform comparison between types %s and %s",
                               type_name[exprs[0]->m_vtype],
                               type_name[exprs[1]->m_vtype]);