Method with

crates/wasmtime/src/runtime/component/concurrent.rs:458–465

Run the specified closure, passing it mutable access to the store. This function is one of the main building blocks of the [`Accessor`] type. This yields synchronous, blocking, access to the store via an [`Access`]. The [`Access`] implements [`AsContextMut`] in addition to providing the ability to access `D` via [`Access::get`]. Note that the `fun` here is given only temporary access to the store

(&self, fun: impl FnOnce(Access<'_, T, D>) -> R)

    /// then this function will panic. It is up to the embedder to ensure that
    /// this does not happen.
    pub fn with<R>(&self, fun: impl FnOnce(Access<'_, T, D>) -> R) -> R {
        tls::get(|vmstore| {
            fun(Access {
                store: self.token.as_context_mut(vmstore),
                get_data: self.get_data,
            })
        })
    }

    /// Returns the getter this accessor is using to project from `T` into
    /// `D::Data`.