When self.start > self.end, these iterators simply return None,
so we adjust the size_hint to just return zero in this case.
Certain optimizations can be implemented in and outside libstd if we
know we can trust the size_hint for all inputs to for example
Range<usize>.
This corrects the ExactSizeIterator implementations, which IMO were
unsound and incorrect previously, since they allowed a range like (2..1)
to return a size_hint of -1us in when debug assertions are turned off.
Given `<expr> as Box<Trait>`, infer that `Box<_>` is expected type for `<expr>`.
This is useful for addressing fallout from newly proposed box protocol; see #22006 for examples of such fallout, much of which will be unnecessary with this fix.
When trying to build against a newer, local LLVM version it might be
preferable to have a flag to disable the LLVM version check instead of
having to modify the configure script.
Fixes#21998
Simplify cache selection by just using the local cache whenever there
are any where-clauses at all. This seems to be the simplest possible
rule and will (hopefully!) put an end to these annoying "cache leak"
bugs. Fixes#22019.
r? @aturon
```rust
#[plugin] #[no_link] extern crate bleh;
```
becomes a crate attribute
```rust
#![plugin(bleh)]
```
The feature gate is still required.
It's almost never correct to link a plugin into the resulting library / executable, because it will bring all of libsyntax and librustc with it. However if you really want this behavior, you can get it with a separate `extern crate` item in addition to the `plugin` attribute.
Fixes#21043.
Fixes#20769.
[breaking-change]
This commit is an implementation of [RFC 739][rfc] which adds a new `std::fs`
module to the standard library. This module provides much of the same
functionality as `std::old_io::fs` but it has many tweaked APIs as well as uses
the new `std::path` module.
[rfc]: https://github.com/rust-lang/rfcs/pull/739
This commit is an implementation of [RFC 739][rfc] which adds a new `std::fs`
module to the standard library. This module provides much of the same
functionality as `std::old_io::fs` but it has many tweaked APIs as well as uses
the new `std::path` module.
[rfc]: https://github.com/rust-lang/rfcs/pull/739
Right now it is not possible to write a `for` loop without opting-in to the
`core` feature due to the way they're expanding (calling
`::std::iter::IntoIterator::into_iter`). There are some planned tweaks to the
`IntoIterator` trait (adding an `Item` associated type) which will cause
implementations of `IntoIterator` to break, but the *usage* of the trait is
currently stable.
This commit marks the method `into_iter` as stable as the name will not be
changing, nor the fact that it takes no arguments and returns one type (which is
determiend by the `Self` type). This means that usage of `for` loops is now
stable but manual implementations of the `IntoIterator` trait will continue to
be unstable.
This is in preparation for stabilization of the `IntoIterator` trait. All
implementations and references to `Iter` need to be renamed to `IntoIter`.
[breaking-change]
#[plugin] #[no_link] extern crate bleh;
becomes a crate attribute
#![plugin(bleh)]
The feature gate is still required.
It's almost never correct to link a plugin into the resulting library /
executable, because it will bring all of libsyntax and librustc with it.
However if you really want this behavior, you can get it with a separate
`extern crate` item in addition to the `plugin` attribute.
Fixes#21043.
Fixes#20769.
[breaking-change]
This allows people to write tools which are drop-in replacements for rustc by implementing `CompilerCalls` and three lines of code, rather than having to copy+paste a bunch of args parsing code.
r? @alexcrichton
Crate types from multiple sources appear to be deduplicated properly, but not
deduplicated if they come from the command line arguments. At worst, this used
to cause compiler failures when `--crate-type=lib,rlib` (the same as
`--crate-type=rlib,rlib`, at least at the time of this commit) is provided and
generate the output multiple times otherwise.
Alex Crichton
Felix S. Klock II
Björn Steinbrink
Andrew Paseltiner
Vojtech Kral
Marvin Löbel
bors
Nick Cameron
Steve Klabnik
Keegan McAllister
Luke Steensen
Pierre Baillet
Sean Collins
Simonas Kazlauskas
Michael Budde
we