error code 5 with comptime stack and optionals

[fluid arch]

I get error code 5 with this code, why does this happen?

const std = @import("std");

fn ComptimeStack(comptime T: type) type {
    return struct {
        array: []T,

        pub inline fn init() @This() {
            return .{ .array = &.{} };
        }

        pub inline fn push(comptime self: *@This(), item: T) !void {
            var a = (self.array ++ .{item}).*;
            self.array = &a;
        }
    };
}

pub fn main() void {
    comptime var stack = ComptimeStack(struct { u32, ?struct { val: u8 } }).init();
    comptime try stack.push(.{420, null});
    std.mem.doNotOptimizeAway(stack);
}

zig 0.12.0-dev.2063+804cee3b9

[naive girder]

i got it to run with this 1 change:

pub inline fn push(self: *@This(), item: T) !void {

EDITED

not sure why it segfaulted otherwise, but if you can make a reduced test case which reproduces the segfault, i think you should open an issue.

[fluid arch]

this is already pretty reduced, I took it from zacc https://github.com/silversquirl/zacc

exec.zig line 92
as I was able to trace it back to line 37 that crashes the compiler

it seems that passing null or undefined would crash it