From 57cec3011d65472d010d8ce92c9e4fc7b5e80a0b Mon Sep 17 00:00:00 2001
From: Evan Haas <evan@lagerdata.com>
Date: Mon, 1 Apr 2024 11:35:45 -0700
Subject: [PATCH] Parser: do not attempt to cast floats to incomplete-size ints

Fixes #660
---
 src/aro/Parser.zig | 4 ++++
 test/cases/casts.c | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/src/aro/Parser.zig b/src/aro/Parser.zig
index 13c6bed9..5507e0ae 100644
--- a/src/aro/Parser.zig
+++ b/src/aro/Parser.zig
@@ -5962,6 +5962,10 @@ pub const Result = struct {
             if (to.is(.bool)) {
                 res.val.boolCast(p.comp);
             } else if (old_float and new_int) {
+                if (to.hasIncompleteSize()) {
+                    try p.errStr(.cast_to_incomplete_type, l_paren, try p.typeStr(to));
+                    return error.ParsingFailed;
+                }
                 // Explicit cast, no conversion warning
                 _ = try res.val.floatToInt(to, p.comp);
             } else if (new_float and old_int) {
diff --git a/test/cases/casts.c b/test/cases/casts.c
index 86607458..f0a48ce0 100644
--- a/test/cases/casts.c
+++ b/test/cases/casts.c
@@ -16,6 +16,7 @@ void foo(void) {
     (enum E)1;
     int *ptr;
     ptr = (int *)(void)5;
+    (enum DoesNotExist)2.0;
 }
 
 #define EXPECTED_ERRORS "casts.c:5:5: error: cannot cast to non arithmetic or pointer type 'struct Foo'" \
@@ -27,4 +28,5 @@ void foo(void) {
     "casts.c:11:13: error: pointer cannot be cast to type 'float'" \
     "casts.c:16:5: error: cast to incomplete type 'enum E'" \
     "casts.c:18:18: error: used type 'void' where arithmetic or pointer type is required" \
+    "casts.c:19:5: error: cast to incomplete type 'enum DoesNotExist'" \