rust/tests/ui/lang-items/required-lang-item.rs

//@ edition: 2018

#![feature(lang_items, no_core)]
#![no_core]
#![no_main]

#[lang="copy"] pub trait Copy { }
#[lang="sized"] pub trait Sized { }

async fn x() {} //~ ERROR requires `ResumeTy` lang_item
Stop mentioning internal lang items in no_std binary errors When writing a no_std binary, you'll be greeted with nonsensical errors mentioning lang items like eh_personality and start. That's pretty bad because it makes you think that you need to define them somewhere! But oh no, now you're getting the `internal_features` lint telling you that you shouldn't use them! But you need a no_std binary! What now? No problem! Writing a no_std binary is super easy. Just use panic=abort and supply your own platform specific entrypoint symbol (like `main`) and you're good to go. Would be nice if the compiler told you that, right? This makes it so that it does do that. 2023-10-02 12:32:31 +00:00			`//@ edition: 2018`
rework run-fail and support check,build-fail 2019-12-14 04:28:32 +01:00
syntax: Implement #![no_core] This commit is an implementation of [RFC 1184][rfc] which tweaks the behavior of the `#![no_std]` attribute and adds a new `#![no_core]` attribute. The `#![no_std]` attribute now injects `extern crate core` at the top of the crate as well as the libcore prelude into all modules (in the same manner as the standard library's prelude). The `#![no_core]` attribute disables both std and core injection. [rfc]: https://github.com/rust-lang/rfcs/pull/1184 2015-07-29 17:01:14 -07:00			`#![feature(lang_items, no_core)]`
			`#![no_core]`
Stop mentioning internal lang items in no_std binary errors When writing a no_std binary, you'll be greeted with nonsensical errors mentioning lang items like eh_personality and start. That's pretty bad because it makes you think that you need to define them somewhere! But oh no, now you're getting the `internal_features` lint telling you that you shouldn't use them! But you need a no_std binary! What now? No problem! Writing a no_std binary is super easy. Just use panic=abort and supply your own platform specific entrypoint symbol (like `main`) and you're good to go. Would be nice if the compiler told you that, right? This makes it so that it does do that. 2023-10-02 12:32:31 +00:00			`#![no_main]`
Renumber the lang items correctly Also add a test to help prevent this from getting out of sync again. 2013-09-18 01:37:34 -07:00
rustc_typeck: correctly track "always-diverges" and "has-type-errors". 2016-10-26 02:28:20 +03:00			`#[lang="copy"] pub trait Copy { }`
Fallout in tests 2015-03-31 19:58:01 -04:00			`#[lang="sized"] pub trait Sized { }`
Ensure that the return type of a function is Sized While no real rvalue of an unsized type can exist, a diverging function can still "return" a value of such a type, which causes an ICE. Fixes #18107. 2014-10-18 23:12:02 +03:00
Stop mentioning internal lang items in no_std binary errors When writing a no_std binary, you'll be greeted with nonsensical errors mentioning lang items like eh_personality and start. That's pretty bad because it makes you think that you need to define them somewhere! But oh no, now you're getting the `internal_features` lint telling you that you shouldn't use them! But you need a no_std binary! What now? No problem! Writing a no_std binary is super easy. Just use panic=abort and supply your own platform specific entrypoint symbol (like `main`) and you're good to go. Would be nice if the compiler told you that, right? This makes it so that it does do that. 2023-10-02 12:32:31 +00:00			async fn x() {} //~ ERROR requires `ResumeTy` lang_item