Compile error "reached the type-length limit while instantiating"

[blkhlouf1]

Issue found on deploy with Heroku :

Compiling check-if-email-exists-cli v0.8.13 (/tmp/build_092091e8_)
error: reached the type-length limit while instantiating <std::iter::Map<std::iter::Map<s..., ()}]>, ()}]>}]>}]>>::Future}]>
|
= note: consider adding a #![type_length_limit="2016981"] attribute to your crate
error: aborting due to previous error
error: could not compile check-if-email-exists-cli.

[amaury1093]

I added the following lines, as per the hint (with a much larger number):

https://github.com/amaurymartiny/check-if-email-exists/blob/889e52170ef44aa92cfd8e74b177a41f838b841b/src/main.rs#L17-L18

I'm leaving this issue open, if anyone has ideas.

[mre]

@amaurymartiny seems like it's an issue with the Rust 1.46 toolchain.
Using a newer version (1.47+) seems to fix it.
See rust-lang/rust#54540 and lycheeverse/lychee#9 for a fix.
Credits go to @xiaochuanyu and @pawroman.

[amaury1093]

fixed in #665