palette: Compilation error when trying to use palette

When adding any use statement from my local palette crate to my library – I have not tried using the official version – I get the following error:

error[E0275]: overflow evaluating the requirement `f64: std::ops::Div<palette::blend::PreAlpha<_>>`
  --> src\text.rs:35:50
   |
35 |         let centering_height_shift = self.height / 2.0;
   |                                                  ^
   |
   = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`web_utils`)
   = note: required because of the requirements on the impl of `std::ops::Div<palette::blend::PreAlpha<palette::blend::PreAlpha<_>>>` for `f64`
   = note: 127 redundant requirements hidden
   = note: required because of the requirements on the impl of `std::ops::Div<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<palette::blend::PreAlpha<_>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>` for `f64`

The error goes away, when I comment out the line impl_scalar_binop!(Div::div, DivAssign::div_assign, [f32, f64]);

I believe is unrelated to my local changes and it certainly is unrelated to the code, where the error occurs. It may be related to a bug in the rust compiler.

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 52 (35 by maintainers)

Commits related to this issue

Remove `impl<C> $op_trait<PreAlpha<C>> for {f32,f64}` impls to work around issue #283 — committed to Ogeon/palette by Ogeon a year ago
Merge #312 312: Remove `impl<C> $op_trait<PreAlpha<C>> for {f32,f64}` `impl`s to work around issue #283 r=Ogeon a=Ogeon The compiler seem to sometimes get stuck in a loop when these operator implem... — committed to Ogeon/palette by bors[bot] a year ago
Snapshot for Ogeon/palette#283 — committed to Smalands-Nation/register-rs by Strosel 4 months ago

Most upvoted comments

With this patch applied, the compiler seems to get stuck (2 minutes of CPU time and counting on the example above, 19 minutes and counting on the original project).

fenhl on Feb 18, 2024

I’m also running into this while attempting to upgrade iced. Here’s a minimal example:

use {
    std::convert::Infallible,
    iced::{
        Application,
        Command,
        Element,
        Settings,
        widget::Column,
    },
};

struct State;

impl Application for State {
    type Executor = iced::executor::Default;
    type Message = Infallible;
    type Theme = iced::Theme;
    type Flags = ();

    fn new((): Self::Flags) -> (Self, Command<Infallible>) { (Self, Command::none()) }
    fn title(&self) -> String { String::default() }
    fn update(&mut self, _: Infallible) -> Command<Infallible> { Command::none() }

    fn view(&self) -> Element<'_, Infallible> {
        Column::with_children(Vec::default().into_iter().map(|()| Column::new()).collect()).into()
    }
}

fn main() -> iced::Result {
    State::run(Settings::default())
}

fenhl on Feb 18, 2024

The fix has been released in 0.7.1. Feel free to reopen this issue if it appears again.

Ogeon on Apr 16, 2023