Paper over privacy issues with Deref by changing field names.
Types that implement Deref can cause weird error messages due to their
private fields conflicting with a field of the type they deref to, e.g.,
previously
struct Foo { x: int }
let a: Arc<Foo> = ...;
println!("{}", a.x);
would complain the the `x` field of `Arc` was private (since Arc has a
private field called `x`) rather than just ignoring it.
This patch doesn't fix that issue, but does mean one would have to write
`a._ptr` to hit the same error message, which seems far less
common. (This patch `_`-prefixes all private fields of
`Deref`-implementing types.)
cc #12808
Types that implement Deref can cause weird error messages due to their
private fields conflicting with a field of the type they deref to, e.g.,
previously
struct Foo { x: int }
let a: Arc<Foo> = ...;
println!("{}", a.x);
would complain the the `x` field of `Arc` was private (since Arc has a
private field called `x`) rather than just ignoring it.
This patch doesn't fix that issue, but does mean one would have to write
`a._ptr` to hit the same error message, which seems far less
common. (This patch `_`-prefixes all private fields of
`Deref`-implementing types.)
cc #12808
The compiler now tracks which attributes were actually looked at during the compilation process and warns for those that were unused.
Some things of note:
* The tracking is done via thread locals, as it made the implementation more straightforward. Note that this shouldn't hamper any future parallelization as each task can have its own thread local state which can be merged for the lint pass. If there are serious objections to this, I can restructure things to explicitly pass the state around.
* There are a number of attributes that have to be special-cased and globally whitelisted. This happens for four reasons:
* The `doc` and `automatically_derived` attributes are used by rustdoc, but not by the compiler.
* The crate-level attributes `license`, `desc` and `comment` aren't currently used by anything.
* Stability attributes as well as `must_use` are checked only when the tagged item is used, so we can't guarantee that the compiler's looked at them.
* 12 attributes are used only in trans, which happens after the lint pass.
#14300 is adding infrastructure to track lint state through trans, which this lint should also be able to use to handle the last case. For the other attributes, the right solution would probably involve a specific pass to mark uses that occur in the correct context. For example, a `doc` attribute attached to a match arm should generate a warning, but will not currently.
RFC: 0002-attribute-usage
There's a fair number of attributes that have to be whitelisted since
they're either looked for by rustdoc, in trans, or as needed. These can
be cleaned up in the future.
Some functions implemented for the Ascii struct have the same functionality as other functions implemented for the normal chars. For consistency, I think they should have the same name, so I renamed the functions in Ascii to match the names in the Char trait.
* Renamed `to_lower` to `to_lowercase`
* Renamed `to_upper` to `to_uppercase`
* Renamed `is_alpha` to `is_alphabetic`
* Renamed `is_alnum` to `is_alphanumeric`
* Renamed `is_lower` to `is_lowercase`
* Renamed `is_upper` to `is_uppercase`
[breaking-change]
On some systems (iOS for example) mutex is represented by opaque data structure which doesn't play well with simple data copy. Therefore mutex should be initialized from magic static value and filled by OS only when it landed RC.
Initially written for iOS but since landing iOS support might require quite a lot of time I think it is better to split parts which aren't directly related to iOS and merge them in
Some functions implemented for the Ascii struct have the same functionality as other functions implemented for the normal chars. For consistency, I think they should have the same name, so I renamed the functions in Ascii to match the names in the Char trait.
* Renamed `to_lower` to `to_lowercase`
* Renamed `to_upper` to `to_uppercase`
* Renamed `is_alpha` to `is_alphabetic`
* Renamed `is_alnum` to `is_alphanumeric`
* Renamed `is_lower` to `is_lowercase`
* Renamed `is_upper` to `is_uppercase`
[breaking-change]
* All of the *_val functions have gone from #[unstable] to #[stable]
* The overwrite and zeroed functions have gone from #[unstable] to #[stable]
* The uninit function is now deprecated, replaced by its stable counterpart,
uninitialized
[breaking-change]
On some systems (iOS for example) mutex is represented by
opaque data structure which doesn't play well with simple
data copy. Therefore mutex should be initialized from
magic static value and filled by OS only when it landed RC.
* All of the *_val functions have gone from #[unstable] to #[stable]
* The overwrite and zeroed functions have gone from #[unstable] to #[stable]
* The uninit function is now deprecated, replaced by its stable counterpart,
uninitialized
[breaking-change]
We can now mark arguments and returns as `nonnull` in LLVM. It's still somewhat limited by the fact that LLVM loses this information after inlining but it might help in certain cases.
All of these features have been obsolete since February 2014, where most have
been obsolete since 2013. There shouldn't be any more need to keep around the
parser hacks after this length of time.
The span on a inner doc-comment would point to the next token, e.g. the span for the `a` line points to the `b` line, and the span of `b` points to the `fn`.
```rust
//! a
//! b
fn bar() {}
```
One of the long-term goals of the libstd facade is to move the collections
library underneath the standard library. This would imply that libcollections
today would invert its dependency with libstd.
One of the primary blockers for doing this is the HashMap collection. Of its two
major dependencies, hashing and randomness, this commit is the first step in
dealing with hashing.
When moving the hash module beneath libstd, it must break its primary dependence
on the io::Writer trait (used as the hashing state). The proposed strategy for
breaking this dependence is taking a similar path as core::fmt, which is to have
the hash module define its own "writer trait". This trait would be similar to
std::io::Writer, except that it would not return errors and it would have fewer
convenience methods.
The Hash trait today has its type parameter behind a feature gate (default type
parameters), so this pending change will likely break no code which hasn't opted
in to the feature gate. The SipState struct will lose its implementation of
io::Writer, but it will regain similar methods for dealing with writing data.
This change specifically prepares for the hash migration by modifying
deriving(Hash) to use the std:#️⃣:Writer bound instead of the std::io::Writer
bound. This bound is currently wired to std::io::Writer, but after a snapshot it
will have no need to be wired to the io writer trait.
