From 1f28fcdec5210762e1ebcf5d5d386d1427f82126 Mon Sep 17 00:00:00 2001
From: Josh Wolfe <thejoshwolfe@gmail.com>
Date: Mon, 13 Nov 2017 19:39:46 -0700
Subject: [PATCH] parsec supports C NULL to pointer implicit cast

---
 src/parsec.cpp  |  5 ++---
 test/parsec.zig | 10 ++++++++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/parsec.cpp b/src/parsec.cpp
index 09f5be0fa7..a3c2456bb1 100644
--- a/src/parsec.cpp
+++ b/src/parsec.cpp
@@ -1267,6 +1267,8 @@ static AstNode *trans_implicit_cast_expr(Context *c, AstNode *block, ImplicitCas
                 node->data.fn_call_expr.params.append(target_node);
                 return node;
             }
+        case CK_NullToPointer:
+            return trans_create_node(c, NodeTypeNullLiteral);
         case CK_Dependent:
             emit_warning(c, stmt->getLocStart(), "TODO handle C translation cast CK_Dependent");
             return nullptr;
@@ -1291,9 +1293,6 @@ static AstNode *trans_implicit_cast_expr(Context *c, AstNode *block, ImplicitCas
         case CK_ToUnion:
             emit_warning(c, stmt->getLocStart(), "TODO handle C translation cast CK_ToUnion");
             return nullptr;
-        case CK_NullToPointer:
-            emit_warning(c, stmt->getLocStart(), "TODO handle C translation cast CK_NullToPointer");
-            return nullptr;
         case CK_NullToMemberPointer:
             emit_warning(c, stmt->getLocStart(), "TODO handle C translation cast CK_NullToMemberPointer");
             return nullptr;
diff --git a/test/parsec.zig b/test/parsec.zig
index d47ea2e33e..c3f4ab5412 100644
--- a/test/parsec.zig
+++ b/test/parsec.zig
@@ -596,6 +596,16 @@ pub fn addCases(cases: &tests.ParseCContext) {
         \\    return @sizeOf(c_int);
         \\}
     );
+
+    cases.addC("null pointer implicit cast",
+        \\int* foo(void) {
+        \\    return 0;
+        \\}
+    ,
+        \\export fn foo() -> ?&c_int {
+        \\    return null;
+        \\}
+    );
 }