canceling a coroutine leads to defers not executed

[andrewrk]

const std = @import("std");

var defer1: bool = false;
var defer2: bool = false;

test "aoeu" {
    _ = async<std.debug.global_allocator> asyncTest() catch unreachable;
    std.debug.assert(defer1);
    std.debug.assert(defer2);
}

async fn asyncTest() void {
    defer {
        defer1 = true;
    }
    await (async baz() catch unreachable);
}

var bar_handle: promise = undefined;

async fn baz() void {
    const foo_handle = async foo() catch unreachable;
    resume bar_handle;
    cancel bar_handle;
    defer {
        defer2 = true;
    }
    const value = await foo_handle;
    @panic("unreachable");
}

async fn foo() i32 {
    await (async bar() catch unreachable);
    return 1234;
}

async fn bar() void {
    suspend |p| {
        bar_handle = p;
    }
    suspend;
}