panicked at 'called xilem: Option::unwrap() on a None value

[mclelz]

I got this error when I tried to run the hello example, I am on Windows 11. `thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', C:\Users\isaac\Documents\xilem\src\app.rs:202:47 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace error: process didn't exit successfully: `target\debug\examples\hello.exe` (exit code: 0xc0000409, STATUS_STACK_BUFFER_OVERRUN)`

[lawrnce]

@isaacmclellan Did you end up finding a solution to this? I have the same problem on Windows 11.

thread 'main' panicked at C:\Users\Larry\Documents\GitHub\xilem\src\app.rs:202:47:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library\std\src\panicking.rs:595
   1: core::panicking::panic_fmt
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library\core\src\panicking.rs:67
   2: core::panicking::panic
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library\core\src\panicking.rs:117
   3: enum2$<core::option::Option<ref_mut$<xilem::widget::core::Pod> > >::unwrap<ref_mut$<xilem::widget::core::Pod> >
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33\library\core\src\option.rs:935
   4: xilem::app::App<i32,xilem::view::linear_layout::LinearLayout<i32,tuple$<>,tuple$<xilem::view::button::Button<i32,tuple$<> >,xilem::view::linear_layout::LinearLayout<i32,tuple$<>,tuple$<xilem::view::button::Button<i32,tuple$<> >,xilem::view::button::Button
             at .\src\app.rs:202
   5: xilem::app_main::impl$1::accesskit_tree<i32,xilem::view::linear_layout::LinearLayout<i32,tuple$<>,tuple$<xilem::view::button::Button<i32,tuple$<> >,xilem::view::linear_layout::LinearLayout<i32,tuple$<>,tuple$<xilem::view::button::Button<i32,tuple$<> >,xil
             at .\src\app_main.rs:120
   6: glazier::backend::windows::window::impl$8::window_proc::closure$22::closure$0::closure$0
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:1194
   7: once_cell::unsync::impl$8::get_or_init::closure$0<accesskit_windows::adapter::Adapter,glazier::backend::windows::window::impl$8::window_proc::closure$22::closure$0::closure_env$0>
             at C:\Users\Larry\.cargo\registry\src\index.crates.io-6f17d22bba15001f\once_cell-1.18.0\src\lib.rs:593
   8: once_cell::unsync::OnceCell<accesskit_windows::adapter::Adapter>::get_or_try_init<accesskit_windows::adapter::Adapter,once_cell::unsync::impl$8::get_or_init::closure_env$0<accesskit_windows::adapter::Adapter,glazier::backend::windows::window::impl$8::wind
             at C:\Users\Larry\.cargo\registry\src\index.crates.io-6f17d22bba15001f\once_cell-1.18.0\src\lib.rs:631
   9: once_cell::unsync::OnceCell<accesskit_windows::adapter::Adapter>::get_or_init<accesskit_windows::adapter::Adapter,glazier::backend::windows::window::impl$8::window_proc::closure$22::closure$0::closure_env$0>
             at C:\Users\Larry\.cargo\registry\src\index.crates.io-6f17d22bba15001f\once_cell-1.18.0\src\lib.rs:593
  10: glazier::backend::windows::window::impl$8::window_proc::closure$22::closure$0
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:1191
  11: enum2$<core::option::Option<ref_mut$<glazier::backend::windows::window::WndState> > >::map<ref_mut$<glazier::backend::windows::window::WndState>,enum2$<core::option::Option<accesskit_windows::adapter::WmGetObjectResult> >,glazier::backend::windows::window
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33\library\core\src\option.rs:1075
  12: glazier::backend::windows::window::MyWndProc::with_wnd_state<glazier::backend::windows::window::impl$8::window_proc::closure$22::closure_env$0,enum2$<core::option::Option<accesskit_windows::adapter::WmGetObjectResult> > >
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:453
  13: glazier::backend::windows::window::impl$8::window_proc::closure$22
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:1186
  14: enum2$<core::option::Option<alloc::rc::Rc<glazier::backend::windows::window::WindowState,alloc::alloc::Global> > >::and_then<alloc::rc::Rc<glazier::backend::windows::window::WindowState,alloc::alloc::Global>,accesskit_windows::adapter::WmGetObjectResult,g
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33\library\core\src\option.rs:1414
  15: glazier::backend::windows::window::impl$8::window_proc
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:1180
  16: glazier::backend::windows::window::win_proc_dispatch
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:1526
  17: DispatchMessageW
  18: DispatchMessageW
  19: GetClassLongW
  20: KiUserCallbackDispatcher
  21: NtUserMessageCall
  22: SendMessageTimeoutW
  23: AccessibleObjectFromWindow
  24: PropMgrClient_LookupProp
  25: AccGetRunningUtilityState
  26: AccGetRunningUtilityState
  27: TF_CreateThreadMgr
  28: TF_UninitSystem
  29: TF_CreateThreadMgr
  30: CtfImeDispatchDefImeMessage
  31: RegisterWindowMessageA
  32: KiUserCallbackDispatcher
  33: NtUserShowWindow
  34: glazier::backend::windows::window::WindowHandle::show
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\backend\windows\window.rs:1611
  35: glazier::window::WindowHandle::show
             at C:\Users\Larry\.cargo\git\checkouts\glazier-3a172f69e2427c5a\19a01ba\src\window.rs:205
  36: xilem::app_main::AppLauncher<i32,xilem::view::linear_layout::LinearLayout<i32,tuple$<>,tuple$<xilem::view::button::Button<i32,tuple$<> >,xilem::view::linear_layout::LinearLayout<i32,tuple$<>,tuple$<xilem::view::button::Button<i32,tuple$<> >,xilem::view::b
             at .\src\app_main.rs:87
  37: hello::main
             at .\examples\hello.rs:44
  38: core::ops::function::FnOnce::call_once<void (*)(),tuple$<> >
             at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33\library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\examples\hello.exe` (exit code: 0xc0000409, STATUS_STACK_BUFFER_OVERRUN)

[Philipp-M]

Well, this is a bug, and I think it's a race condition (haven't investigated this in detail though).

Anyway, could you try this fix: #138

[lawrnce]

#138 works on my machine. Thanks!