Due to the way iterators work, the std::iter module is chock full of
structs that you, humble Rust programmer, will never actually use.
However, they have URLs, and therefore get linked to, because they are
real structs that do exist.
So, rather than just have a tiny sentence about each one of them,
this patch adds links back to the functions and methods on Iterator
which actually create the structs, where helpful documentation already
exists.
`OsString` has these sorts of conversions, while `CString` has been missing them. I'm iffy on `into_string` simply because the return type would be better off as `FromUtf8Error<CString>`, which of course isn't generic 😢
Also should a different/new feature gate be used?
Fixes#29128
Most of the weird lifetime things and `inner` stuff seems like leftover cruft from `thread::scoped`. Should `JoinInner` just be removed/merged with `JoinHandle`?
Also is it okay to remove the `FnBox`? I'm not really sure why there were two allocations there...
This PR turns statically known erroneous code (e.g. numeric overflow) into a warning and continues normal code-generation to emit the same code that would have been generated without `check_const` detecting that the result can be computed at compile-time.
<del>It's not done yet, as I don't know how to properly emit a lint from trans. I can't seem to extract the real lint level of the item the erroneous expression is in.</del> It's an unconditional warning now.
r? @pnkfelix
cc @nikomatsakis
* [RFC 1229 text](https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md)
* RFC PR: rust-lang/rfcs#1229
* tracking issue: https://github.com/rust-lang/rust/issues/28238
The escaped form isn't pretty, but this should be a very rare error.
Having a general binary-escaping string creation function might be a
good idea, though.
Closes#29122
The escaped form isn't pretty, but this should be a very rare error.
Having a general binary-escaping string creation function might be a
good idea, though.
Closes#29122
When going through the docs, it is not clear that binary files cannot be tested. Additionally, it is hard to find the proper structure of a Rust crate and it took me several hours of looking through the docs to find the crates and modules section. I think we can link to it from here and it will be beneficial to those who are coming to the language.
While working on #28711 I found out that
* src/libcoretest/clone.rs
* src/libcoretest/fmt/float.rs
* src/libcoretest/intrinsics.rs
are not used. I am not sure if removing them is the right way to go. If it makes sense to keep (and fix and enable) them, I would be happy to update the PR.
This PR solves the following issues (or at least help users to understand the problem):
```Rust
#![crate_name = "b"]
#![crate_type = "rlib"]
pub fn his_function_has_a_very_long_name_and_should_make_cargo_doc_explodes_because_it_will_want_to_make_a_filename_with_it_in_excess_of_the_max_filename_length_for_most_filesystem_this_is_not_yet_long_enough_i_need_moreis_function_has_a_very_long_name_and_should_make_cargo_doc_explodes_because_it_will_want_to_make_a_filename_with_it_in_excess_of_the_max_filename_length_for_most_filesystem_this_is_not_yet_long_enough_i_need_more_() {}
```
```Rust
#![crate_name = "b"]
#![crate_type = "rlib"]
pub struct his_function_has_a_very_long_name_and_should_make_cargo_doc_explodes_because_it_will_want_to_make_a_filename_with_it_in_excess_of_the_max_filename_length_for_most_filesystem_this_is_not_yet_long_enough_i_need_moreis_function_has_a_very_long_name_and_should_make_cargo_doc_explodes_because_it_will_want_to_make_a_filename_with_it_in_excess_of_the_max_filename_length_for_most_filesystem_this_is_not_yet_long_enough_i_need_more_;
```
For the maximum filename length chosen, @gkoz gave me [this link](http://unix.stackexchange.com/a/32834).
This change has two consequences:
1. It makes `Arc<T>` and `Rc<T>` covariant in `T`.
2. It causes the compiler to reject code that was unsound with respect
to dropck. See compile-fail/issue-29106.rs for an example of code that
no longer compiles. Because of this, this is a [breaking-change].
Fixes#29037.
Fixes#29106.
Stricter checking of stability attributes + enforcement of their invariants at compile time
(+ removed dead file librustc_front/attr.rs)
I intended to enforce use of `reason` for unstable items as well (it normally presents for new items), but it turned out too intrusive, many older unstable items don't have `reason`s.
r? @aturon
I'm studying how stability works and do some refactoring along the way, so it's probably not the last PR.
