Closes#18959
Technically, this causes code that once compiled to no longer compile, but
that code probably never ran.
[breaking-change]
------------
Not quite sure the error message is good enough, I feel like it ought to tell you "because it inherits from non-object-safe trait Foo", so I've opened up a follow-up issue #19538
There is already a test for `union` in the test namespace, but this commit adds a doctest that will appear in the rustdocs.
Someone on IRC said, *Write doctests!*, so here I am.
I am not sure this is the best way to demonstrate the behavior of the union function, so I am open to suggestions for improving this. If I am on the right track I'd be glad to include similar doctests for `intersection`, `difference`, etc.
In regards to:
https://github.com/rust-lang/rust/issues/19253#issuecomment-64836729
This commit:
* Changes the #deriving code so that it generates code that utilizes fewer
reexports (in particur Option::\*, Result::\*, and Ordering::\*), which is necessary to
remove those reexports in the future
* Changes other areas of the codebase so that fewer reexports are utilized
Previously, `BufWriter::write` would just return an `std::io::OtherIoError` if someone attempted to write past the end of the wrapped buffer. This pull request changes the error to support partial writes and return a `std::io::ShortWrite`, or an `io::io::EndOfFile` if it's been fully exhausted.
I've also optimized away a bounds check inside `BufWriter::write`, which should help shave off some nanoseconds in an inner loops.
In regards to:
https://github.com/rust-lang/rust/issues/19253#issuecomment-64836729
This commit:
* Changes the #deriving code so that it generates code that utilizes fewer
reexports (in particur Option::* and Result::*), which is necessary to
remove those reexports in the future
* Changes other areas of the codebase so that fewer reexports are utilized
Add a rustdoc test for union to exhibit how it is used.
There is already a test for union in the test namespace, but this commit
adds a doctest that will appear in the rustdocs.
Add a doctest for the difference function.
Add a doctest for the symmetric_difference function.
Add a doctest for the intersection function.
Update the union et al. doctests based on @Gankro's comments.
Make the union et al. doctests a bit more readable.
Adds the ability to use a custom allocator heap by passing either --cfg
external_crate and --extern external=<allocator_crate_name> or --cfg
external_funcs and defining the allocator functions prefixed by 'rust_'
somewhere.
This is useful for many applications including OS/embedded development,
and allocator development and testing.
Part of #18424
Adds `capacity()` function to VecMap, as per the collections reform.
(Salvaged from #19516, #19523, while we await an RFC regarding `reserve`/`reserve_index` for `VecMap`)
Right now, `DerefMut` is not `for Sized?`, so you can't impl `DerefMut<T> for Foo` where `Foo` is unsized. However, there is no reason that it can't be `for Sized?`, so this pull request fixes the issue.
Closes#19493.
We heavily rely on queries and fragments in the URL structure, so it is desired to preserve them even in the redirects. The generated redirect pages try to preserve them with scripts, which take precedence over the original `Refresh` metadata. Non-scripting browsers would continue to work (with no queries and fragments).
(This in turn solves a number of semi-broken links to the source code, which are actually linked to redirect pages.)
Added the example from [this Reddit thread][1], reworked to be more robust with correct logic (first link skipped the 0th and 1st Fibonacci numbers, second forgot about the last two valid values before overflow). Will yield all Fibonacci numbers sequentially in the range `[0, <u32 as Int>::max_value())`.
If the example is too complicated I can change it to a more naive version, perhaps using signed integers to check for overflow instead of `Option` and `.checked_add()`.
Also reworded the doc comments to clarify the usage and behavior of `Unfold`, as the thread suggested that it wasn't really clear how `Unfold` worked and when one should use it.
This change is in the `core` crate but I based the example on `std` since that's where most readers will find the example. I included a note about `core` for clarity. Edit: removed.
Tested with `rustdoc src/libcore/lib.rs`. Rebased against latest master as of the creation of this PR.
[1]: http://www.reddit.com/r/rust/comments/2ny8r1/a_question_about_loops/cmighu4?context=10000
This series of commits deals with broken links to the source code. It also refactors some repetitive codes from Rustdoc. The most important commit, 1cb1f00d40, describes the rationale; this will fix a half of #16289. Other commits are reasonably independent to each other and can be made into indiviudal PRs at the request.
### Notes on the broken source links
As of bda97e8557 (I've used this to check the PR works as intended), there are 281 (!) such broken links. They can be further classified as follows:
* 178 links to incorrect item types. This is the first half of #16289, and this PR fixes all of them.
* 89 links to redirect pages. They are not technically "broken" but still doesn't give a source code. I have a fix for this in mind, which would make a redirect page slightly *fat*.
* 14 links to incorrect `DefId` in the `gotosrc` parameter. This is #15309, and affects many `liballoc` reexports in `libstd` but *nothing else* (curiously). I'm yet to track this down; might be a metadata bug (not sure).
* 0 links to the crate reexported as a different name. This is the second half of #16289, and seems not hard to fix but I'm running out of time.
Prevalence of this kind of bugs calls for a full link verifier integrated into the testing process. :S
As an example of what this changes, the following code:
```rust
let x: [int ..4];
```
Currently spits out ‘expected `]`, found `..`’. However, a comma would also be valid there, as would a number of other tokens. This change adjusts the parser to produce more accurate errors, so that that example now produces ‘expected one of `(`, `+`, `,`, `::`, or `]`, found `..`’.
(Thanks to cramer on IRC for pointing out this problem with diagnostics.)
deriving encodable + using json::PrettyEncoder removes the only ToJson trait implementation in the rust repository outside of libserialize
@pcwalton does this agree with your FIXME comment?
1. Made small improvements to the docs for checked_sub, checked_mul and checked_div.
2. Updated a confusingly outdated comment for intrinsics, noticed before at <https://stackoverflow.com/questions/23582931/>.
Using `and` here instead of `but` sounds better to me, as but makes it sound like an item which is still under active development shouldn't normally require more testing, but this one does - or something like that :-)
@steveklabnik?
After the library successfully called `fork(2)`, the child does several
setup works such as setting UID, GID and current directory before it
calls `exec(2)`. When those setup works failed, the child exits but the
parent didn't call `waitpid(2)` and left it as a zombie.
This patch also add several sanity checks. They shouldn't make any
noticeable impact to runtime performance.
The new test case in `libstd/io/process.rs` calls the ps command to check
if the new code can really reap a zombie.
The output of `ps -A -o pid,sid,command` should look like this:
```
PID SID COMMAND
1 1 /sbin/init
2 0 [kthreadd]
3 0 [ksoftirqd/0]
...
12562 9237 ./spawn-failure
12563 9237 [spawn-failure] <defunct>
12564 9237 [spawn-failure] <defunct>
...
12592 9237 [spawn-failure] <defunct>
12593 9237 ps -A -o pid,sid,command
12884 12884 /bin/zsh
12922 12922 /bin/zsh
...
```
where `./spawn-failure` is my test program which intentionally leaves many
zombies. Filtering the output with the "SID" (session ID) column is
a quick way to tell if a process (zombie) was spawned by my own test
program. Then the number of "defunct" lines is the number of zombie
children.
io::stdin returns a new `BufferedReader` each time it's called, which
results in some very confusing behavior with disappearing output. It now
returns a `StdinReader`, which wraps a global singleton
`Arc<Mutex<BufferedReader<StdReader>>`. `Reader` is implemented directly
on `StdinReader`. However, `Buffer` is not, as the `fill_buf` method is
fundamentaly un-thread safe. A `lock` method is defined on `StdinReader`
which returns a smart pointer wrapping the underlying `BufferedReader`
while guaranteeing mutual exclusion.
Code that treats the return value of io::stdin as implementing `Buffer`
will break. Add a call to `lock`:
```rust
io::stdin().read_line();
// =>
io::stdin().lock().read_line();
```
Closes#14434
[breaking-change]
The only other place I know of that doesn’t allow trailing commas is closure types (#19414), and those are a bit tricky to fix (I suspect it might be impossible without infinite lookahead) so I didn’t implement that in this patch. There are other issues surrounding closure type parsing anyway, in particular #19410.
