slint-ui/slint · error

Recursion detected

Error message

Recursion detected

What it means

Error "Recursion detected" thrown in slint-ui/slint.

Source

Thrown at internal/core/properties.rs:628

    fn has_no_binding_or_lock(handle: *mut ()) -> bool {
        handle.addr() & (BINDING_BORROWED | BINDING_POINTER_TO_BINDING) == 0
    }

    /// Access the value.
    /// Panics if the function try to recursively access the value
    fn access<R>(&self, f: impl FnOnce(Option<Pin<&mut BindingHolder>>) -> R) -> R {
        #[cfg(slint_debug_property)]
        if self.lock_flag() {
            unsafe {
                let handle = self.handle.get();
                if let Some(binding_pointer) = Self::pointer_to_binding(handle) {
                    let binding = &mut *(binding_pointer);
                    let debug_name = &binding.debug_name;
                    panic!("Recursion detected with property {debug_name}");
                }
            }
        }
        assert!(!self.lock_flag(), "Recursion detected");
        unsafe {
            self.set_lock_flag(true);
            scopeguard::defer! { self.set_lock_flag(false); }
            let handle = self.handle.get();
            let binding =
                Self::pointer_to_binding(handle).map(|pointer| Pin::new_unchecked(&mut *(pointer)));
            f(binding)
        }
    }

    /// Transfer the dependency list from the current binding back to the
    /// handle and return the now-detached binding pointer. The binding is
    /// **not** dropped; the caller is responsible for its lifetime.
    ///
    /// Returns `None` when the handle does not point to a binding.
    fn detach_binding(&self) -> Option<*mut BindingHolder> {
        let binding = Self::pointer_to_binding(self.handle.get())?;
        unsafe {

View on GitHub (pinned to 3fd8f2ec03)

Solutions

1. Break the binding loop: remove the cyclic dependency between the reported properties.
2. Use a one-way binding or a changed handler to cut the cycle.

When it happens

Trigger: Thrown at internal/core/properties.rs:628 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of slint-ui/slint@3fd8f2ec03 (2026-08-19). Data as JSON: /api/errors/55f66d08c260963e. Report an issue: GitHub.