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Error as of tag leptos tut(lesson): 6.1 Async - Loading Data with Resources in this repo.

I'm working through the Leptos Book/Tutorial and I've hit a wall at section 6.1 Loading Data with Resources.

I have copied the Source and Cargo.toml from CodeSandbox.

This code works as expected on CodeSandbox but I'm getting a compile error on my local machine.

The full error is:

And the related source:

I have tried the CodeSandbox Source form the next two entries (6.2 Suspense, 6.3 Transition) all work as expected on CodeSandbox, but fail with similar errors relating to create_resource on my machine.

I have noted the compiler help:

    = help: the trait `std::ops::Fn<()>` is not implemented for `ReadSignal<{integer}>`
    = note: wrap the `ReadSignal<{integer}>` in a closure with no arguments: `|| { /* code */ }`
note: required by a bound in `leptos::create_resource`

and fiddled around trying to implement its suggestion to no avail. But I really don't know enough about rust or leptos at this point to make sense of all this. I'm pretty much just guessing.

My environment:

rustc -V: rustc 1.73.0-nightly (474709a9a 2023-08-03)

trunk -V: trunk 0.17.2

macOS: Monterey 12.6.7

Cargo.toml:

[package]
name = "app"
version = "0.1.0"
edition = "2021"

[dependencies]
leptos = { git = "https://github.com/leptos-rs/leptos" }
console_log = "0.2"
log = "0.4"
console_error_panic_hook = "0.1.7"
gloo-timers = { version = "0.2", features = ["futures"] }

I tried rolling back to rust v 1.69 and leptos 0.4.0 and still got the same result.

Any suggestions, hints or guess are much appreciated!