var ctx: EmitZIR = .{
        .allocator = allocator,
        .decls = .{},
        .arena = std.heap.ArenaAllocator.init(allocator),
        .old_module = &old_module,
        .next_auto_name = 0,
        .names = std.StringHashMap(void).init(allocator),
        .primitive_table = std.AutoHashMap(Inst.Primitive.Builtin, *Decl).init(allocator),
        .indent = 0,
        .block_table = std.AutoHashMap(*ir.Inst.Block, *Inst.Block).init(allocator),
        .loop_table = std.AutoHashMap(*ir.Inst.Loop, *Inst.Loop).init(allocator),
        .metadata = std.AutoHashMap(*Inst, Module.MetaData).init(allocator),
        .body_metadata = std.AutoHashMap(*Module.Body, Module.BodyMetaData).init(allocator),
    };
    defer ctx.metadata.deinit();
    defer ctx.body_metadata.deinit();
    defer ctx.block_table.deinit();
    defer ctx.loop_table.deinit();
    defer ctx.decls.deinit(allocator);
    defer ctx.names.deinit();
    defer ctx.primitive_table.deinit();
    errdefer ctx.arena.deinit();

    try ctx.emit();

    return Module{
        .decls = ctx.decls.toOwnedSlice(allocator),
        .arena = ctx.arena,
        .metadata = ctx.metadata,
        .body_metadata = ctx.body_metadata,
    };