Fixes#22047
Range<u64> and Range<i64> may be longer than usize::MAX on 32-bit
platforms, and thus they cannot fulfill the protocol for
ExactSizeIterator. We don't want a nonobvious platform dependency in
basic iterator traits, so the trait impl is removed.
The logic of this change assumes that usize is at least 32-bit.
This is technically a breaking change; note that Range<usize> and
Range<isize> are always ExactSizeIterators.
[breaking-change]
if found on the `main()` function. This lets you write tests that live
in `compile-fail` but are expected to compile successfully. This is
handy when you have many small variations on a theme that you want to
keep together, and you are just testing the type checker, not the
runtime semantics.
Added a second note about keeping the reference.md list up-to-date to
the bottom of the list, since not everyone (including me) reads the
big comment at the top of it. :)
Ensured that the feature gate list in reference.md is kept in
alphabetical order.
Rollup merge (373cbab5b08d6630da58f28d2166c19afc327fa6) of PR #20723
accidentally reverted a portion of commit
8327bcc167661c26ca5c6b967309ff745d302329 which shifted
`slicing_syntax` from Active to Accepted.
Names of structs, enums, traits, type aliases and type parameters (i.e. all identifiers that can be used as full paths in type position) are not allowed to match the names of primitive types.
See #20427 for more information.
This is a minor [breaking-change]
It is not totally clear if we should just use whitespace, or if the full
unicode word-breaking algorithm is more correct. If there is demand we
can reconsider this decision (and consider the precise algorithm to use
in detail).
cc #15628.
borrowck: Prevent partial reinitialization of uninitialized structures
This is a pnkfelix-swiped squash of #22079, which was a rebase and revision of #18963Fixes#18571.
It is only allowed in paths now, where it will either work inside a `trait`
or `impl` item, or not resolve outside of it.
[breaking-change]
Closes#22137
This resolves a number of bugs that trigger stack overflows or other cyclic errors.
r? @nick29581 (it is based on work that you started)
f? @jroesch (also based on your branch)
