std.json.parseFromSlice divide by zero

[MasonRemaley]

Zig Version

0.14.0

Steps to Reproduce and Observed Behavior

This test:

test "zero sized" {
    const Struct = struct {
        a: []const enum { a } = &.{}, // <-- note that this enum is 0 sized
    };
    const header = try std.json.parseFromSlice(
        Struct,
        std.testing.allocator,
        "{\"a\": [\"a\"] }",
        .{},
    );
    defer header.deinit();
}

Results in this output:

test
└─ run test
   └─ zig test Debug native 1 errors
/home/mason/Documents/zig/lib/std/mem.zig:4219:70: error: division by zero here causes undefined behavior
    return @as(cast_target, @ptrCast(bytes))[0..@divExact(bytes.len, @sizeOf(T))];

If you replace the zero sized enum with a non zero sized type, then it works as expected.

I caught this while upgrading a project to 0.14.0, so presumably the bug was introduced some time in the past few months, but I haven't checked exactly which version I was running previously.

Expected Behavior

I expected the test to pass.

[samy-00007]

This actually seems to be an issue with bytesAsSlice, which is now called by remap (previously, resize did not call the function), as it doesn't check for the element size.