This is useful to build os abstraction like the nix crate does.
It allows to define functions, which accepts generic arguments
of data structures convertible to RawFd, including RawFd itself.
For example:
fn write<FD: AsRawFd>(fd: FD, buf: &[u8]) -> Result<usize>
instead of:
fn write(fd: RawFd, buf: &[u8]) -> Result<usize>
write(foo.as_raw_fd(), buf);
Part of #29363
Changed summary sentences of SocketAddr and IpAddr for consistency
Linked to SocketAddrV4 and SocketAddrV6 from SocketAddr, moving explaination
there
Expanded top-level docs for SocketAddrV4 and SocketAddrV6, linking to some
relevant IETF RFCs, and linking back to SocketAddr
Changed some of the method summaries to third person as per RFC 1574; added
links to IETF RFCs where appropriate
Part of #29363
Expanded top-level documentation & linked to relevant IETF RFCs.
Added a bunch of links (to true/false/Ipv4Addr/etc.) throughout the docs.
Part of #29363
In the section about the default implementations of ToSocketAddrs,
I moved the bulletpoint of SocketAddrV4 & SocketAddrV6 to the one
stating that SocketAddr is constructed trivially, as this is what's
actually the case
Allow `use` macro imports to shadow global macros
Terminology:
- global scope: builtin macros, macros from the prelude, `#[macro_use]`, or `#![plugin(..)]`.
- legacy scope: crate-local `macro_rules!`.
- modern scope: `use` macro imports, `macro` (once implemented).
Today, the legacy scope can shadow the global scope (modulo RFC 1560 expanded shadowing restrictions). However, the modern scope cannot shadow or be shadowed by either the global or legacy scopes, leading to ambiguity errors.
This PR allows the modern scope to shadow the global scope (subject to some restrictions).
More specifically, a name in the global scope is as shadowable as a glob import in the module `self`. In other words, we imagine a special, implicit glob import in each module item:
```rust
mod foo {
#[lexical_only] // Not accessible via `foo::<name>`, like pre-RFC 1560 `use` imports.
#[shadowable_by_legacy_scope] // for back-compat
use <global_macros>::*;
}
```
r? @nrc
The data can't be looked up from the region variable directly, because
the region variable might have been destroyed at the end of a snapshot.
Fixes#40000.
Fixes#40743.
Remove internal liblog
This commit deletes the internal liblog in favor of the implementation that
lives on crates.io. Similarly it's also setting a convention for adding crates
to the compiler. The main restriction right now is that we want compiler
implementation details to be unreachable from normal Rust code (e.g. requires a
feature), and by default everything in the sysroot is reachable via `extern
crate`.
The proposal here is to require that crates pulled in have these lines in their
`src/lib.rs`:
#![cfg_attr(rustbuild, feature(staged_api, rustc_private))]
#![cfg_attr(rustbuild, unstable(feature = "rustc_private", issue = "27812"))]
This'll mean that by default they're not using these attributes but when
compiled as part of the compiler they do a few things:
* Mark themselves as entirely unstable via the `staged_api` feature and the
`#![unstable]` attribute.
* Allow usage of other unstable crates via `feature(rustc_private)` which is
required if the crate relies on any other crates to compile (other than std).
* Point at where the token was expected instead of the last token
successfuly parsed.
* Only show `unexpected token` if the next char and the unexpected token
don't have the same span.
* Change some cfail and pfail tests to ui test.
* Don't show all possible tokens in span label if they are more than 6.
try to fix the build on emscripten
The "upstream" emscripten tar.gz now extracts to `emsdk-portable` instead of `emsdk_portable`, breaking our CI. It might be better to vendor a specific version of emscripten instead of using the latest, but I could not find a good way of doing that.
r? @alexcrichton
Before the docs only had a line about where it was found and that it was
a handle to stderr. This commit changes it so that the summary second line is
removed and that it's a bit clearer about what can be done with it. Part of
\#29370
Instead of
```
error: no method named `src_addr` found for type `&wire::ipv4::Repr` in the current scope
--> src/wire/ipv4.rs:409:34
|
409 | packet.set_src_addr(self.src_addr());
| ^^^^^^^^
|
note: did you mean to write `self.src_addr`?
--> src/wire/ipv4.rs:409:34
|
409 | packet.set_src_addr(self.src_addr());
| ^^^^^^^^
```
present
```
error: no method named `src_addr` found for type `&wire::ipv4::Repr` in the current scope
--> src/wire/ipv4.rs:409:34
|
409 | packet.set_src_addr(self.src_addr());
| ^^^^^^^^ `src_addr` is a field, not a method
|
= help: did you mean to write `self.src_addr` instead of `self.src_addr(...)`?
```
try to fix the build on emscripten
The "upstream" emscripten tar.gz now extracts to `emsdk-portable` instead of `emsdk_portable`, breaking our CI. It might be better to vendor a specific version of emscripten instead of using the latest, but I could not find a good way of doing that.
r? @alexcrichton
Optimize insertion sort
This change slightly changes the main iteration loop so that LLVM can optimize it more efficiently.
Benchmark:
```
name before ns/iter after ns/iter diff ns/iter diff %
slice::sort_unstable_small_ascending 39 (2051 MB/s) 38 (2105 MB/s) -1 -2.56%
slice::sort_unstable_small_big_random 579 (2210 MB/s) 575 (2226 MB/s) -4 -0.69%
slice::sort_unstable_small_descending 80 (1000 MB/s) 70 (1142 MB/s) -10 -12.50%
slice::sort_unstable_small_random 396 (202 MB/s) 386 -10 -2.53%
```
The benchmark is not a fluke. I can see that performance on `small_descending` is consistently better after this change. I'm not 100% sure why this makes things faster, but my guess would be that `v.len()+1` to the compiler looks like it could in theory overflow.
Add warning for use of lifetime parameter with 'static bound
Previously a `'static` lifetime bound would result in an `undeclared lifetime` error when compiling, even though it could be considered valid.
However, it is unnecessary to use it as a lifetime bound so we present the user with a warning instead and suggest using the `'static` lifetime directly, in place of the lifetime parameter. We can change this to an error (or warning with lint) if that's decided to be more appropriate.
Example output:
```
warning: unnecessary lifetime parameter `'a`
--> ../static-lifetime-bound.rs:3:10
|
3 | fn f<'a: 'static>(val: &'a i32) {
| ^^^^^^^^^^^
|
= help: you can use the `'static` lifetime directly, in place `'a`
```
Fixes#40661
r? @jseyfried
Rewrite `io::BufRead` doc examples to better demonstrate behaviors.
Prior to this commit, most of the `BufRead` examples used `StdinLock` to
demonstrate how certain `BufRead` methods worked. Using `StdinLock` is
not ideal since:
* Relying on run-time data means we can't show concrete examples of how
these methods work up-front. The user is required to run them in order
to see how they behave.
* If the user tries to run an example in the playpen, it won't work
because the playpen doesn't support user input to stdin.
```rust
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `)`
--> $DIR/token-error-correct-3.rs:29:9
|
25 | foo()
| - expected one of `.`, `;`, `?`, `}`, or an operator after this
...
29 | } else {
| ^ unexpected token
```
```rust
struct S;
impl S {
pub hello_method(&self) {
println!("Hello");
}
}
fn main() { S.hello_method(); }
```
```rust
error: can't qualify macro invocation with `pub`
--> file.rs:3:4
|
3 | pub hello_method(&self) {
| ^^^- - expected `!` here for a macro invocation
| |
| did you mean to write `fn` here for a method declaration?
|
= help: try adjusting the macro to put `pub` inside the invocation
```
