add compile error for @ptrCast 0 bit type to non-0 bit type

1 files changed, 13 insertions, 0 deletions

diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index d1e9f6d03a..a1dd33fb43 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -2,6 +2,19 @@ const tests = @import("tests.zig");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
     cases.add(
+        "@ptrCast a 0 bit type to a non- 0 bit type",
+        \\export fn entry() bool {
+        \\    var x: u0 = 0;
+        \\    const p = @ptrCast(?*u0, &x);
+        \\    return p == null;
+        \\}
+    ,
+        ".tmp_source.zig:3:15: error: '*u0' and '?*u0' do not have the same in-memory representation",
+        ".tmp_source.zig:3:31: note: '*u0' has no in-memory bits",
+        ".tmp_source.zig:3:24: note: '?*u0' has in-memory bits",
+    );
+
+    cases.add(
         "comparing a non-optional pointer against null",
         \\export fn entry() void {
         \\    var x: i32 = 1;