I'm making an async function for a library. It's not very big, but yet I'm meeting the error: error: reached the type-length limit while instantiating `std::pin::Pin::<&mut std::future...}[1]::poll[0]::{{closure}}[0])]>` | = note: consider adding a `#![type_length_limit="9479903"]` attribu…

The proposed fix is found here . Basically the issue is that when functions have a signature like this: fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnOnce(Self::Output) -> Fut, Fut: Future, The return type Then includes the type of Fut in both F and Fut, thus the exponential …

Exponential type size of async function

help

Ploppz January 13, 2020, 9:50am 3

That makes sense, thanks a ton!

2 Likes

Extremely slow compile times in test suite

Topic		Replies	Views
Explosive type sizes ("reached type-length limit") - once and for all help	6	856	May 25, 2020
Is it a bad sign to have the 'reached the type-length limit' error while working with futures? help	7	1991	January 12, 2023
Announcing async-std v1.5.0	1	480	May 3, 2020
Writing an async function wrapper help	5	267	November 17, 2024
I made a library for naming async fn return types on stable Rust (w/o boxing or dyn) announcements	1	416	November 6, 2022

Exponential type size of async function

Related topics