Book: small improvement to a table to make it clearer
This table is used as an example of four heap values where two of them got deallocated leaving a gap.
It also has stack variables.
Instead of four stack variables I propose three, that way there's no misleading connection between the number of stack variables and heap variables.
But more importantly: three of the four stack variables had the same name (**y**) which could be confusing to a beginner, I changed this as well.
rustdoc: Add doc snippets for trait impls, with a read more link
The read more link only appears if the documentation is more than one line long.
It currently does not appear on non-defaulted methods, since you can document them directly. I could make it so that default documentation gets forwarded if regular docs don't exist.
Fixes#33672
r? @alexcrichton
cc @steveklabnik
std: Cache HashMap keys in TLS
This is a rebase and extension of #31356 where we not only cache the keys in
thread local storage but we also bump each key every time a new `HashMap` is
created. This should give us a nice speed bost in creating hash maps along with
retaining the property that all maps have a nondeterministic iteration order.
Closes#27243
std: Backport a libbacktrace soundness fix
This is a backport of gcc-mirror/gcc@047a1c2f which is a soundness fix for when
a backtrace is generated on executables that do not have debug information.
rustc: Add a new crate type, cdylib
This commit is an implementation of [RFC 1510] which adds a new crate type,
`cdylib`, to the compiler. This new crate type differs from the existing `dylib`
crate type in a few key ways:
* No metadata is present in the final artifact
* Symbol visibility rules are the same as executables, that is only reachable
`extern` functions are visible symbols
* LTO is allowed
* All libraries are always linked statically
This commit is relatively simple by just plubming the compiler with another
crate type which takes different branches here and there. The only major change
is an implementation of the `Linker::export_symbols` function on Unix which now
actually does something. This helps restrict the public symbols from a cdylib on
Unix.
With this PR a "hello world" `cdylib` is 7.2K while the same `dylib` is 2.4MB,
which is some nice size savings!
[RFC 1510]: https://github.com/rust-lang/rfcs/pull/1510Closes#33132
This is a rebase and extension of #31356 where we cache the keys in thread local
storage. This should give us a nice speed bost in creating hash maps along with
mostly retaining the property that all maps have a nondeterministic iteration
order.
Closes#27243
Implement `last` for `EscapeUnicode`
The implementation is quite trivial as the last character is always `'{'`.
As a side-effect it also improves the implementation of `last` for `EscapeUnicode`.
Part of #24214, split from #31049.
Maybe this (and the other changes that I will split from #31049) should wait for a test like `ed_iterator_specializations` to be added. Would it be sufficient to do the same for each possible escape length?
This commit is an implementation of [RFC 1510] which adds a new crate type,
`cdylib`, to the compiler. This new crate type differs from the existing `dylib`
crate type in a few key ways:
* No metadata is present in the final artifact
* Symbol visibility rules are the same as executables, that is only reachable
`extern` functions are visible symbols
* LTO is allowed
* All libraries are always linked statically
This commit is relatively simple by just plubming the compiler with another
crate type which takes different branches here and there. The only major change
is an implementation of the `Linker::export_symbols` function on Unix which now
actually does something. This helps restrict the public symbols from a cdylib on
Unix.
With this PR a "hello world" `cdylib` is 7.2K while the same `dylib` is 2.4MB,
which is some nice size savings!
[RFC 1510]: https://github.com/rust-lang/rfcs/pull/1510Closes#33132
This updates the vendor'd libbacktrace source to tpick up
gcc-mirror/gcc@047a1c2f which is a soundness fix for when a backtrace is
generated on executables that do not have debug information.
Rust syntax coloring for some ignore, should-panic and no-run snippets.
In the book, some code blocks were missing the `rust` specifier which is needed for them to highlight correctly.
Only print parameters with elided lifetimes in elision error messages.
When displaying the function parameters for a lifetime elision error message,
this changes it to first filter out the parameters that don't have elided
lifetimes.
Fixes#30255.
rustdoc: Make the #[stable(since)] version attribute clearer with a tooltip
Rustdoc's new 'since' version placement only shows the version number in which the item was marked stable. This gains space but might make the meaning of this version string less clear in the docs, so I tried to bring some explicitness in a tooltip.
std: Update libc submodule
Brings in a fix where `-lutil` is no longer passed for musl targets, lifting the
need for a musl toolchain to be installed again.
Closes#33608
Add regression tests for error message when using enum variant as a type
I'm guessing these were actually fixed with PR #27085.
Closes#21225Closes#19197
Add a note about Higher-Ranked Trait Bounds in docs on Closures.
I hit a snag with lifetimes a few days ago and it wasn't until @birkenfeld pointed out Higher-Ranked Trait Bounds that I was able to solve the issue involving lifetimes on closure traits. This adds a small section in the book so that other users can find it.
r? @steveklabnik
Add error explanation for E0502
I am questioning the order of presentation on the suggested code fixes, but I'm not sure what would be best. Thoughts?
r? @GuillaumeGomez
Fix for old school error issues, improvements to new school
This PR:
* Fixes some old school error issues, specifically #33559, #33543, #33366
* Improves wording borrowck errors with match patterns
* De-emphasize multi-line spans, so we don't color the single source character when we're trying to say "span starts here"
* Rollup of #33392 (which should help fix#33390)
r? @nikomatsakis
