Provides a custom implementation of Iterator methods `count`, `nth`, and `last` for the structures `slice::{Windows,Chunks,ChunksMut}` in the core module.
These implementations run in constant time as opposed to the default implementations which run in linear time.
Addresses Issue #24214
r? @aturon
Pretty-printed files sometimes start with #![some_feature], which
looks like a shebang line and confuses Windows builds into thinking
they are executables.
The corrected signature of `ioctl` broke some crates on crates.io, and it's not
currently worth the major version bump of libc, so for now keep the old
signature around for crates.io builds only with a comment to remove it at a
future date.
This should allow libc on crates.io to update to the master version in-tree.
I've verified that this was the only breakage of substance between the version
libc is currently built with and today's master branch.
on every call. This ensures that implies bounds are reasonable
(the older code only checked that the values provided had WF types, but
we also must know that the formal types of the arguments are WF.)
warnings. It also checks more conditions than the old code. Keep the
old wf code around unchanged so that we can continue to issue errors for
the cases where we used to report errors.
As part of this, remove the where-clauses-must-reference-parameter rule,
which is easily circumvented.
`implicator`. These definitions are also in accordance with RFC 1214 (or
more so), and hence somewhat different from the implicator. This commit
also modifies the implicator to remove the older rules for projections,
which can easily trigger infinite loops.
after we check casts, because sometimes casts can influence inference,
unfortunately. We do re-run `select_all_trait_obligations` during
regionck anyhow.
This commit removes all unstable and deprecated functions in the standard
library. A release was recently cut (1.3) which makes this a good time for some
spring cleaning of the deprecated functions.
Implemented count, nth, and last in constant time for Windows, Chunks,
and ChunksMut created from a slice.
Included checks for overflow in the implementation of nth().
Also added a test for each implemented method to libcoretest.
Addresses #24214
Initial version of PR had an DerefMut implementation, which was later removed
because it may cause mutable reference aliasing.
Suggest how to implement mutability with reentrant mutex and remove the claim we
implement DerefMut.
