MultiArrayList: Fix error when struct is 0 sized

Also fixes error with ArrayHashMap when both key and value are 0 sized

1 files changed, 29 insertions, 0 deletions

diff --git a/lib/std/array_hash_map.zig b/lib/std/array_hash_map.zig
index 7ebafc0a1b..efd75a0fee 100644
--- a/lib/std/array_hash_map.zig
+++ b/lib/std/array_hash_map.zig
@@ -2215,6 +2215,35 @@ test "auto store_hash" {
     try testing.expect(meta.fieldInfo(HasExpensiveEqlUn.Data, .hash).field_type != void);
 }
 
+test "0 sized key" {
+    var map = AutoArrayHashMap(u0, i32).init(std.testing.allocator);
+    defer map.deinit();
+
+    try testing.expectEqual(map.get(0), null);
+
+    try map.put(0, 5);
+    try testing.expectEqual(map.get(0), 5);
+
+    try map.put(0, 10);
+    try testing.expectEqual(map.get(0), 10);
+
+    try testing.expectEqual(map.swapRemove(0), true);
+    try testing.expectEqual(map.get(0), null);
+}
+
+test "0 sized key and 0 sized value" {
+    var map = AutoArrayHashMap(u0, u0).init(std.testing.allocator);
+    defer map.deinit();
+
+    try testing.expectEqual(map.get(0), null);
+
+    try map.put(0, 0);
+    try testing.expectEqual(map.get(0), 0);
+
+    try testing.expectEqual(map.swapRemove(0), true);
+    try testing.expectEqual(map.get(0), null);
+}
+
 pub fn getHashPtrAddrFn(comptime K: type, comptime Context: type) (fn (Context, K) u32) {
     return struct {
         fn hash(ctx: Context, key: K) u32 {