Mark it with the `unreachable` feature and put it into the `mem` module.
This is a pretty straight-forward API that can already be simulated in
stable Rust by using `transmute` to create an uninhabited enum that can
be matched.
Update the list of confusable characters
Also reorder and space the list to make it clearer for futures updates
and to come closer to the original list.
This was tedious but somewhat rewarding!
Thanks @est31 for the instructions.
Fixes#43629.
r? @est31
The spans previously encoded only span the first token after the opening
brace, up to the closing brace of inline `mod` declarations. Thus, when
examining exports from an external crate, the spans don't include the
header of inline `mod` declarations.
make `for_all_relevant_impls` O(1) again
A change in #41911 had made `for_all_relevant_impls` do a linear scan over
all impls, instead of using an HashMap. Use an HashMap again to avoid
quadratic blowup when there is a large number of structs with impls.
I think this fixes#43141 completely, but I want better measurements in
order to be sure. As a perf patch, please don't roll this up.
r? @eddyb
beta-nominating because regression
A change in #41911 had made `for_all_relevant_impls` do a linear scan over
all impls, instead of using an HashMap. Use an HashMap again to avoid
quadratic blowup when there is a large number of structs with impls.
I think this fixes#43141 completely, but I want better measurements in
order to be sure. As a perf patch, please don't roll this up.
[libstd_unicode] Change UNICODE_VERSION to use u32
Looks like there's no strong reason to keep these values at `u64`.
With the current plans for the Unicode Standard, `u8` should be enough for the next 200 years. To stay on the safe side, I'm using `u16` here. I don't see a reason to go with anything machine-dependent/more-efficient.
Update libc to 0.2.29
Cargo pulls in libc from crates.io for a number of dependencies, but 0.2.27 is too old to work properly with Solaris. In particular, it needs the change to make Solaris' `PTHREAD_PROCESS_PRIVATE` a 16-bit integer.
Cargo pulls in libc from crates.io for a number of dependencies, but
0.2.27 is too old to work properly with Solaris. In particular, it
needs the change to make Solaris' PTHREAD_PROCESS_PRIVATE a 16-bit
integer.
Part of #29365.
* Added paragraph adapted from API guidelines that operator implementations
should be unsurprising
* Modified Point example to be more clear when just reading it
Part of #29365.
* Strenghtened summary/explanation split, making phrasings more parallel
* Added links throughout
* Fixed some example formatting & removed extraneous `fn main()`s (or hid
then when needed because of `#![features]`.
* Emphasized note on `RangeFrom`'s `Iterator` implementation
* Added summary sentences to (unstable) `contains` methods
Part of #29365.
* Moved explanations out of Examples section and expanded on them.
* Made the super-/subtrait relationships more explicit.
* Added links to the other traits, TRPL and the nomicon where appropriate
* Changed method summaries to be in 3rd person singular
* General copyediting
Part of #29365.
* Shortened summary sentences, removing "stuttering"
* Small copyediting
* Changed method summary sentences to be in 3rd person singular
* Removed extraneous explicit `fn main()` in example for `IndexMut`
Part of #29365.
* Removed "stuttering" in summary sentence.
* Copy-edited the explanaition sections
* Added sub-headings in Examples section to aid linking
* Actually implement `Drop` in the `PrintOnDrop` exampl
* Add link to Drop chapter in TRPL
* Changed `drop` summary sentence to be in 3rd person singular
* Added missing link to `panic!`
Part of #29365.
* Expanded the explanaition sections, adapting some parts from the book,
the reference, as well as the API guidelines. As such, the docs now
explicitly state that `Deref` and `DerefMut` should only be implemented
for smart pointers and that they should not fail. Additionally, there
is now a short primer on `Deref` coercion.
* Added links to `DerefMut` from `Deref` and vice versa
* Added links to relevant reference sections
* Removed "stuttering" in summary sentences
* Changed summary sentences of `Deref::deref` and `Deref::deref_mut` to
be in 3rd person singular
* Removed explicit uses of `fn main()` in the examples
Part of #29365.
* Added "real" examples for `BitOrAssign`, `BitXorAssign`, `ShlAssign`,
and `ShrAssign`
* Rewrote method summary senteces to be in 3rd person singular
* Rephrased example introductions to be less redundant ("in this example"
etc.) and to not use "trivial"
* Removed superfluous explicit `fn main()`s in examples
* Added some missing periods
Part of #29365.
* Replaced examples for Mul-/Div-/RemAssign with more illustrative ones
* Made summary senteces for the trait methods use third person singular
* Moved some explanations from Examples section to main explanation
* Switched around argument order for the vector-scalar multiplication
example such that the vector is on the left side (as it would be expected
if one were to switch from `*` to `*=`)
* Replaced mostly redundant example introductions with headings in traits
with more than one example (where it made sense)
* Cleaned up some examples to derive `PartialEq` instead of implementing it
manually when that wasn't needed
* Removed explicit `fn main()`s in examples where they weren't necessary
* Rephrased some things
* Added some missing periods
* Fixed some formatting/punctuation in examples
rustc::middle::dataflow - visit the CFG in RPO
We used to propagate bits in node-id order, which sometimes caused an
excessive number of iterations, especially when macros were present. As
everyone knows, visiting the CFG in RPO bounds the number of iterators
by 1 plus the depth of the most deeply nested loop (times the height of
the lattice, which is 1).
I have no idea how this affects borrowck perf in the non-worst-case, so it's probably a good idea to not roll this up so we can see the effects.
Fixes#43704.
r? @eddyb
