Implements RFC 438.
Fixes#19092.
This is a [breaking-change]: change types like `&Foo+Send` or `&'a mut Foo+'a` to `&(Foo+Send)` and `&'a mut (Foo+'a)`, respectively.
r? @brson
TrieSet doesn't yet have union, intersection, difference, and symmetric difference functions implemented. Luckily, TrieSet is largely similar to TreeSet, so I was able to reference the implementations of these functions in the latter, and adapt them as necessary to make them work for TrieSet.
One thing that I thought was interesting is that the Iterator yielded by `iter()` for TrieSet iterates over the set's values directly rather than references to the values (whereas I think in most cases I see the Iterator given by `iter()` iterating over immutable references), so for consistency within TrieSet's interface, all of these Iterators also iterate over the values directly. Let me know if all of these should be instead iterating over references.
At the same time remove the `pub use` of the variants in favor of accessing
through the enum type itself. This is a breaking change as the `Found` and
`NotFound` variants must now be imported through `BinarySearchResult` instead of
just `std::slice`.
[breaking-change]
Closes#19271
I stumbled across this today, and it's not really working. It's been around for a very, very long time, and seems to be based on stuff we don't even have anymore.
I asked in `#rust-internals`, and @cmr said we should just kill it, so here I am. :) I don't think that anything else uses Java, but maybe I missed something.
And if this _isn't_ what we want, I'm fine with closing too. Just some housekeeping.
All of the enum components had a redundant 'Type' specifier: TypeSymlink, TypeDirectory, TypeFile. This change removes them, replacing them with a namespace: FileType::Symlink, FileType::Directory, and FileType::RegularFile.
RegularFile is used instead of just File, as File by itself could be mistakenly thought of as referring to the struct.
Part of #19253.
...of the type being matched.
This change will result in a better diagnostic for code like the following:
```rust
enum Enum {
Foo,
Bar
}
fn f(x: Enum) {
match x {
Foo => (),
Bar => ()
}
}
```
which would currently simply fail with an unreachable pattern error
on the 2nd arm.
The user is advised to either use a qualified path in the patterns
or import the variants explicitly into the scope.
...of the type being matched.
This change will result in a better diagnostic for code like the following:
```rust
enum Enum {
Foo,
Bar
}
fn f(x: Enum) {
match x {
Foo => (),
Bar => ()
}
}
```
which would currently simply fail with an unreachable pattern error
on the 2nd arm.
The user is advised to either use a qualified path in the patterns
or import the variants explicitly into the scope.
This PR adds the `rust-lldb` script (feel free to bikeshed about the name).
The script will start LLDB and, before doing anything else, load [LLDB type summaries](http://lldb.llvm.org/varformats.html) that will make LLDB print values with Rust syntax. Just use the script like you would normally use LLDB:
```
rust-lldb executable-to-debug --and-any-other-commandline --args
```
The script will just add one additional commandline argument to the LLDB invocation and pass along the rest of the arguments to LLDB after that.
Given the following program...
```rust
fn main() {
let x = Some(1u);
let y = [0, 1, 2i];
let z = (x, y);
println!("{} {} {}", x, y, z);
}
```
...*without* the 'LLDB type summaries', values will be printed something like this...
```
(lldb) p x
(core::option::Option<uint>) $3 = {
= (RUST$ENUM$DISR = Some)
= (RUST$ENUM$DISR = Some, 1)
}
(lldb) p y
(long [3]) $4 = ([0] = 0, [1] = 1, [2] = 2)
(lldb) p z
((core::option::Option<uint>, [int, ..3])) $5 = {
= {
= (RUST$ENUM$DISR = Some)
= (RUST$ENUM$DISR = Some, 1)
}
= ([0] = 0, [1] = 1, [2] = 2)
}
```
...*with* the 'LLDB type summaries', values will be printed like this:
```
(lldb) p x
(core::option::Option<uint>) $0 = Some(1)
(lldb) p y
(long [3]) $1 = [0, 1, 2]
(lldb) p z
((core::option::Option<uint>, [int, ..3])) $2 = (Some(1), [0, 1, 2])
```
The 'LLDB type summaries' used by the script have been in use for a while in the LLDB autotests but I still consider them to be of alpha-version quality. If you see anything weird when you use them, feel free to file an issue.
The script will use whatever Rust "installation" is in PATH, so whichever `rustc` will be called if you type `rustc` into the console, this is the one that the script will ask for the LLDB extension module location. The build system will take care of putting the script and LLDB python module in the right places, whether you want to use the stage1 or stage2 compiler or the one coming with `make install` / `rustup.sh`.
Since I don't have much experience with the build system, Makefiles and shell scripts, please look these changes over carefully.
This is an initial pass at stabilizing the `iter` module. The module is
fairly large, but is also pretty polished, so most of the stabilization
leaves things as they are.
Some changes:
* Due to the new object safety rules, various traits needs to be split
into object-safe traits and extension traits. This includes `Iterator`
itself. While splitting up the traits adds some complexity, it will
also increase flexbility: once we have automatic impls of `Trait` for
trait objects over `Trait`, then things like the iterator adapters
will all work with trait objects.
* Iterator adapters that use up the entire iterator now take it by
value, which makes the semantics more clear and helps catch bugs. Due
to the splitting of Iterator, this does not affect trait objects. If
the underlying iterator is still desired for some reason, `by_ref` can
be used. (Note: this change had no fallout in the Rust distro except
for the useless mut lint.)
* In general, extension traits new and old are following an [in-progress
convention](rust-lang/rfcs#445). As such, they
are marked `unstable`.
* As usual, anything involving closures is `unstable` pending unboxed
closures.
* A few of the more esoteric/underdeveloped iterator forms (like
`RandomAccessIterator` and `MutableDoubleEndedIterator`, along with
various unfolds) are left experimental for now.
* The `order` submodule is left `experimental` because it will hopefully
be replaced by generalized comparison traits.
* "Leaf" iterators (like `Repeat` and `Counter`) are uniformly
constructed by free fns at the module level. That's because the types
are not otherwise of any significance (if we had `impl Trait`, you
wouldn't want to define a type at all).
Closes#17701
Due to renamings and splitting of traits, this is a:
[breaking-change]
The type aliases json::JsonString and json::JsonObject were originally
prefixed with 'json' to prevent collisions with (at the time) the enums
json::String and json::Object respectively. Now that enum namespacing
has landed, this 'json' prefix is redundant and can be removed:
json::JsonArray -> json::Array
json::JsonObject -> json::Object
In addition, this commit also unpublicizes all of the re-exports in this
JSON module, as a part of #19253
[breaking-change]
- Add `IntoCow` trait, and put it in the prelude
- Add `is_owned`/`is_borrowed` methods to `Cow`
- Add `CowString`/`CowVec` type aliases (to `Cow<'_, String, str>`/`Cow<'_, Vec, [T]>` respectively)
- `Cow` implements: `Show`, `Hash`, `[Partial]{Eq,Ord}`
- `impl BorrowFrom<Cow<'a, T, B>> for B`
[breaking-change]s:
- `IntoMaybeOwned` has been removed from the prelude
- libcollections: `SendStr` is now an alias to `CowString<'static>` (it was aliased to `MaybeOwned<'static>`)
- libgraphviz:
- `LabelText` variants now wrap `CowString` instead of `MaybeOwned`
- `Nodes` and `Edges` are now type aliases to `CowVec` (they were aliased to `MaybeOwnedVec`)
- libstd/path: `Display::as_maybe_owned` has been renamed to `Display::as_cow` and now returns a `CowString`
- These functions now accept/return `Cow` instead of `MaybeOwned[Vector]`:
- libregex: `Replacer::reg_replace`
- libcollections: `str::from_utf8_lossy`
- libgraphviz: `Id::new`, `Id::name`, `LabelText::pre_escaped_content`
- libstd: `TaskBuilder::named`
r? @aturon
This PR adds some internal infrastructure to allow the private `std::sys` module to access internal representation details of `std::io`.
It then exposes those details in two new, platform-specific API surfaces: `std::os::unix` and `std::os::windows`.
To start with, these will provide the ability to extract file descriptors, HANDLEs, SOCKETs, and so on from `std::io` types.
More functionality, and more specific platforms (e.g. `std::os::linux`) will be added over time.
Closes#18897
This is an initial pass at stabilizing the `iter` module. The module is
fairly large, but is also pretty polished, so most of the stabilization
leaves things as they are.
Some changes:
* Due to the new object safety rules, various traits needs to be split
into object-safe traits and extension traits. This includes `Iterator`
itself. While splitting up the traits adds some complexity, it will
also increase flexbility: once we have automatic impls of `Trait` for
trait objects over `Trait`, then things like the iterator adapters
will all work with trait objects.
* Iterator adapters that use up the entire iterator now take it by
value, which makes the semantics more clear and helps catch bugs. Due
to the splitting of Iterator, this does not affect trait objects. If
the underlying iterator is still desired for some reason, `by_ref` can
be used. (Note: this change had no fallout in the Rust distro except
for the useless mut lint.)
* In general, extension traits new and old are following an [in-progress
convention](https://github.com/rust-lang/rfcs/pull/445). As such, they
are marked `unstable`.
* As usual, anything involving closures is `unstable` pending unboxed
closures.
* A few of the more esoteric/underdeveloped iterator forms (like
`RandomAccessIterator` and `MutableDoubleEndedIterator`, along with
various unfolds) are left experimental for now.
* The `order` submodule is left `experimental` because it will hopefully
be replaced by generalized comparison traits.
* "Leaf" iterators (like `Repeat` and `Counter`) are uniformly
constructed by free fns at the module level. That's because the types
are not otherwise of any significance (if we had `impl Trait`, you
wouldn't want to define a type at all).
Closes#17701
Due to renamings and splitting of traits, this is a:
[breaking-change]
It looks like currently kinds required by traits are not propagated when they are wrapped in a TyTrait. Additionally, in SelectionContext::builtin_bound, no attempt is made to check whether the target trait or its supertraits require the kind specified.
This PR alters SelectionContext::builtin_bound to examine all supertraits in the target trait's bounds recursively for required kinds.
Alternatively, the kinds could be added to the TyTrait upon creation (by just setting its builtin_bounds to the union of the bounds requested in this instance and the bounds required by the trait), this option may have less overhead during compilation but information is lost about which kinds were explicitly requested for this instance (vs those specified by traits/supertraits) would be lost.
This patch merges the `libsync` crate into `libstd`, undoing part of the
facade. This is in preparation for ultimately merging `librustrt`, as
well as the upcoming rewrite of `sync`.
Because this removes the `libsync` crate, it is a:
[breaking-change]
However, all uses of `libsync` should be able to reroute through
`std::sync` and `std::comm` instead.
r? @alexcrichton
Code to fragment paths into pieces based on subparts being moved around, e.g. moving `x.1` out of a tuple `(A,B,C)` leaves behind the fragments `x.0: A` and `x.2: C`. Further discussion in borrowck/doc.rs.
Includes differentiation between assigned_fragments and moved_fragments, support for all-but-one array fragments, and instrumentation to print out the moved/assigned/unmmoved/parents for each function, factored out into a separate submodule.
These fragments can then be used by `trans` to inject stack-local dynamic drop flags. (They also can be hooked up with dataflow to reduce the expected number of injected flags.)
The tests use new "//~| ERROR" follow syntax.
Includes a test for moves involving array elements. It was easier
than i realized to get something naive off the ground here.
Includes differentiation between assigned_fragments and
moved_fragments, support for all-but-one array fragments, and
instrumentation to print out the moved/assigned/unmmoved/parents for
each function, factored out into separate submodule.
This is accomplished by:
1. Add `MatchMode` enum to `expr_use_visitor`.
2. Computing the match mode for each pattern via a pre-pass, and then
passing the mode along when visiting the pattern in
expr_use_visitor.
3. Adding a `fn matched_pat` callback to expr_use_visitor, which is
called on interior struct and enum nodes of the pattern (as opposed
to `fn consume_pat`, which is only invoked for identifiers at the
leaves of the pattern), and invoking it accordingly.
Of particular interest are the `cat_downcast` instances established
when matching enum variants.
This is to fix a problem where I could not reliably map attach the
type for each loan-path to the loan-path itself because the same
loan-path was ending up associated with two different types, because
the cmt's had diverged in their interpretation of the path.
To make this clean, refactored old `LoanPath` enum into a
`LoanPath` struct with a `ty::t` and a newly-added `LoanPathVariant` enum.
This enabled me to get rid of the ugly and fragile `LoanPath::to_type`
method, and I can probably also get rid of other stuff that was
supporting it, maybe.
`LpDowncast` carries the `DefId` of the variant itself. To support
this, added the enum variant `DefId` to the `cat_downcast` variant in
`mem_categorization::categorization`.
(updated to fix mem_categorization to handle downcast of enum
struct-variants properly.)
This change applies the conventions to unwrap listed in [RFC 430][rfc] to rename
non-failing `unwrap` methods to `into_inner`. This is a breaking change, but all
`unwrap` methods are retained as `#[deprecated]` for the near future. To update
code rename `unwrap` method calls to `into_inner`.
[rfc]: https://github.com/rust-lang/rfcs/pull/430
[breaking-change]
cc #19091
