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Stabilize `..` in tuple (struct) patterns
I'd like to nominate `..` in tuple and tuple struct patterns for stabilization.
This feature is a relatively small extension to existing stable functionality and doesn't have known blockers.
The feature first appeared in Rust 1.10 6 months ago.
An example of use: https://github.com/rust-lang/rust/pull/36203
Closes https://github.com/rust-lang/rust/issues/33627
r? @nikomatsakis
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macros: improve expansion performance
This PR fixes that regression, further improves performance on recursive, `tt`-heavy workloads, and makes a variety of other improvements to parsing and expansion performance.
Expansion performance improvements:
| Test case | Run-time | Memory usage |
| -------------- | -------- | ------------ |
| libsyntax | 8% | 10% |
| librustc | 15% | 6% |
| librustc_trans | 30% | 6% |
| #37074 | 20% | 15% |
| #34630 | 40% | 8% |
r? @eddyb
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rustc: Add knowledge of Windows subsystems.
This commit is an implementation of [RFC 1665] which adds support for the
`#![windows_subsystem]` attribute. This attribute allows specifying either the
"windows" or "console" subsystems on Windows to the linker.
[RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
Previously all Rust executables were compiled as the "console" subsystem which
meant that if you wanted a graphical application it would erroneously pop up a
console whenever opened. When compiling an application, however, this is
undesired behavior and the "windows" subsystem is used instead to have control
over user interactions.
This attribute is validated, but ignored on all non-Windows platforms.
cc #37499
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This reverts commit 41745f30f751364bdce14428b7d3ffa5dd028903.
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`Token::Interpolated(Nonterminal)` -> `Token::Interpolated(Rc<Nonterminal>)`.
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patterns
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Most of the Rust community agrees that the vec! macro is clearer when
called using square brackets [] instead of regular brackets (). Most of
these ocurrences are from before macros allowed using different types of
brackets.
There is one left unchanged in a pretty-print test, as the pretty
printer still wants it to have regular brackets.
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This commit is an implementation of [RFC 1665] which adds support for the
`#![windows_subsystem]` attribute. This attribute allows specifying either the
"windows" or "console" subsystems on Windows to the linker.
[RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
Previously all Rust executables were compiled as the "console" subsystem which
meant that if you wanted a graphical application it would erroneously pop up a
console whenever opened. When compiling an application, however, this is
undesired behavior and the "windows" subsystem is used instead to have control
over user interactions.
This attribute is validated, but ignored on all non-Windows platforms.
cc #37499
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Avoid more allocations when compiling html5ever
These three commits reduce the number of allocations performed when compiling html5ever from 13.2M to 10.8M, which speeds up compilation by about 2%.
r? @nrc
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Support `use *;` and `use ::*;`.
Fixes #31484.
r? @nrc
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Fix bad error message with `::<` in types
Fix #36116.
Before:
```rust
error: expected identifier, found `<`
--> src/test/compile-fail/issue-36116.rs:16:52
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16 | let f = Some(Foo { _a: 42 }).map(|a| a as Foo::<i32>);
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error: chained comparison operators require parentheses
--> src/test/compile-fail/issue-36116.rs:16:52
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16 | let f = Some(Foo { _a: 42 }).map(|a| a as Foo::<i32>);
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= help: use `::<...>` instead of `<...>` if you meant to specify type arguments
error: expected expression, found `)`
--> src/test/compile-fail/issue-36116.rs:16:57
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16 | let f = Some(Foo { _a: 42 }).map(|a| a as Foo::<i32>);
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error: expected identifier, found `<`
--> src/test/compile-fail/issue-36116.rs:20:17
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20 | let g: Foo::<i32> = Foo { _a: 42 };
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error: aborting due to 5 previous errors
```
After:
```rust
error: unexpected token: `::`
--> src/test/compile-fail/issue-36116.rs:16:50
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16 | let f = Some(Foo { _a: 42 }).map(|a| a as Foo::<i32>);
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= help: use `<...>` instead of `::<...>` if you meant to specify type arguments
error: unexpected token: `::`
--> src/test/compile-fail/issue-36116.rs:20:15
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20 | let g: Foo::<i32> = Foo { _a: 42 };
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= help: use `<...>` instead of `::<...>` if you meant to specify type arguments
error: aborting due to 2 previous errors
```
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Recover out of an enum or struct's braced block.
If we encounter a syntax error inside of a braced block, then we should
fail by consuming the rest of the block if possible.
This implements such recovery for enums and structs.
Fixes #37113.
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Deprecate no_debug and custom_derive
r? @nikomatsakis
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Implement field shorthands in struct literal expressions.
Implements #37340 in a straight-forward way: `Foo { x, y: f() }` parses as `Foo { x: x, y: f() }`.
Because of the added `is_shorthand` to `ast::Field`, this is `[syntax-breaking]` (cc @Manishearth).
* [x] Mark the fields as being a shorthand (the exact same way we do it in patterns), for pretty-printing.
* [x] Gate the shorthand syntax with `#![feature(field_init_shorthand)]`.
* [x] Don't parse numeric field as identifiers.
* [x] Arbitrary field order tests.
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If we encounter a syntax error inside of a braced block, then we should
fail by consuming the rest of the block if possible.
This implements such recovery for enums and structs.
Fixes #37113.
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Has a custom deprecation since deprecating features is not supported and is a pain to implement
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Fix typo in libsyntax, it was bothering me
May I present - the world's shortest diff.
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check target abi support
This PR checks for each extern function / block whether the ABI / calling convention used is supported by the current target.
This was achieved by adding an `abi_blacklist` field to the target specifications, listing the calling conventions unsupported for that target.
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This avoids 800,000 allocations when compiling html5ever.
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This avoids 800,000 heap allocations when compiling html5ever. It
requires tweaking `SmallVector` a little.
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This avoids 800,000 heap allocations when compiling html5ever.
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Avoid some allocations in the macro parser
These three commits reduce the number of heap allocations done when compiling rustc-benchmarks/html5ever-2016-08-25 by 20%, from 16.5M to 13.3M. This speeds up (debug) compilation of it with a stage1 compiler by about 7%.
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This lets us delay creation of failure messages until they are needed,
which avoids ~1.6M allocations in html5ever.
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This avoids ~800,000 allocations in html5ever.
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This avoids ~800,000 allocations in html5ever.
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r=nikomatsakis
prefer `if let` to match with `None => { }` arm in some places
In #34268 (8531d581), we replaced matches of None to the unit value `()`
with `if let`s in places where it was deemed that this made the code
unambiguously clearer and more idiomatic. In #34638 (d37edef9), we did
the same for matches of None to the empty block `{}`.
A casual observer, upon seeing these commits fly by, might suppose that
the matter was then settled, that no further pull requests on this
utterly trivial point of style could or would be made. Unless ...
It turns out that sometimes people write the empty block with a space in
between the braces. Who knew?
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Allow bootstrapping without a key. Fixes #36548
This will make it easier for packagers to bootstrap rustc when they happen
to have a bootstrap compiler with a slightly different version number.
It's not ok for anything other than the build system to set this environment variable.
r? @alexcrichton
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