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The error and check for this already existed, but the parser didn't try to parse trait method arguments as patterns, so the error was never emitted. This surfaces the error, so we get better errors than simple parse errors.
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Replace push loops with extend() where possible
Or set the vector capacity where I couldn't do it.
According to my [simple benchmark](https://gist.github.com/ljedrz/568e97621b749849684c1da71c27dceb) `extend`ing a vector can be over **10 times** faster than `push`ing to it in a loop:
10 elements (6.1 times faster):
```
test bench_extension ... bench: 75 ns/iter (+/- 23)
test bench_push_loop ... bench: 458 ns/iter (+/- 142)
```
100 elements (11.12 times faster):
```
test bench_extension ... bench: 87 ns/iter (+/- 26)
test bench_push_loop ... bench: 968 ns/iter (+/- 3,528)
```
1000 elements (11.04 times faster):
```
test bench_extension ... bench: 311 ns/iter (+/- 9)
test bench_push_loop ... bench: 3,436 ns/iter (+/- 233)
```
Seems like a good idea to use `extend` as much as possible.
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Prefer to_string() to format!()
Simple benchmarks suggest in some cases it can be faster by even 37%:
```
test converting_f64_long ... bench: 339 ns/iter (+/- 199)
test converting_f64_short ... bench: 136 ns/iter (+/- 34)
test converting_i32_long ... bench: 87 ns/iter (+/- 16)
test converting_i32_short ... bench: 87 ns/iter (+/- 49)
test converting_str ... bench: 54 ns/iter (+/- 15)
test formatting_f64_long ... bench: 349 ns/iter (+/- 176)
test formatting_f64_short ... bench: 145 ns/iter (+/- 14)
test formatting_i32_long ... bench: 98 ns/iter (+/- 14)
test formatting_i32_short ... bench: 93 ns/iter (+/- 15)
test formatting_str ... bench: 86 ns/iter (+/- 23)
```
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Suggest underscore when using dashes in crate namet push fork
Fix #48437.
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Allow declaring existential types inside blocks
fixes #52631
r? @dtolnay
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2018 edition `?` Kleene operator
This is my first attempt at implementing the migration lint + 2018 behavior as discussed in #48075
r? @nikomatsakis
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Ever plagued by #43081 the compiler can return surprising spans in situations
related to procedural macros. This is exhibited by #47983 where whenever a
procedural macro is invoked in a nested item context it would fail to have
correct span information.
While #43230 provided a "hack" to cache the token stream used for each item in
the compiler it's not a full-blown solution. This commit continues to extend
this "hack" a bit more to work for nested items.
Previously in the parser the `parse_item` method would collect the tokens for an
item into a cache on the item itself. It turned out, however, that nested items
were parsed through the `parse_item_` method, so they didn't receive similar
treatment. To remedy this situation the hook for collecting tokens was moved
into `parse_item_` instead of `parse_item`.
Afterwards the token collection scheme was updated to support nested collection
of tokens. This is implemented by tracking `TokenStream` tokens instead of
`TokenTree` to allow for collecting items into streams at intermediate layers
and having them interleaved in the upper layers.
All in all, this...
Closes #47983
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Prepare proc_macro for decoupling it from the rest of the compiler.
This is #49219 up to the point where the bridge is introduced. Aside from moving some code around, the largest change is the rewrite of `proc_macro::quote` to be simpler and do less introspection.
I'd like to also extend `quote!` with `${stmt;...;expr}` instead of just `$variable` (and maybe even `$(... $iter ...)*`), which seems pretty straight-forward now, but I don't know if/when I should.
r? @alexcrichton or @dtolnay cc @jseyfried @petrochenkov
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proc_macro: Preserve spans of attributes on functions
This commit updates the tokenization of items which are subsequently passed to
`proc_macro` to ensure that span information is preserved on attributes as much
as possible. Previously this area of the code suffered from #43081 where we
haven't actually implemented converting an attribute to to a token tree yet, but
a local fix was possible here.
Closes #47941
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This commit updates the tokenization of items which are subsequently passed to
`proc_macro` to ensure that span information is preserved on attributes as much
as possible. Previously this area of the code suffered from #43081 where we
haven't actually implemented converting an attribute to to a token tree yet, but
a local fix was possible here.
Closes #47941
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clarify why we're suggesting removing semicolon after braced items
Previously (issue #46186, pull-request #46258), a suggestion was added
to remove the semicolon after we fail to parse an item, but issue #51603
complains that it's still insufficiently obvious why. Let's add a note.
Resolves #51603.
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Visibility spans were added to the AST in #47799 (d6bdf296) as a
`Spanned<_>`—which means that we need to choose a span even in the case
of inherited visibility (what you get when there's no `pub` &c. keyword
at all). That initial implementation's choice is pretty
counterintuitive, which could matter if we want to use it as a site to
suggest inserting a visibility modifier, &c.
(The phrase "Schelling span" in the comment is meant in analogy to the
game-theoretic concept of a "Schelling point", a value that is chosen
simply because it's what one can expect to agree upon with other agents
in the absence of explicit coördination.)
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Previously (issue #46186, pull-request #46258), a suggestion was added
to remove the semicolon after we fail to parse an item, but issue #51603
complains that it's still insufficiently obvious why. Let's add a note.
Resolves #51603.
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hygiene: Implement transparent marks and use them for call-site hygiene in proc-macros
Fixes https://github.com/rust-lang/rust/issues/50050
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Lowering cleanups [1/N]
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Make FileMap::{lines, multibyte_chars, non_narrow_chars} non-mutable.
This PR removes most of the interior mutability from `FileMap`, which should be beneficial, especially in a multithreaded setting. This is achieved by initializing the state in question when the filemap is constructed instead of during lexing. Hopefully this doesn't degrade performance.
cc @wesleywiser
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The method relied on the FileMap still being under construction in
order for it to do what the name promises. It's now independent of
the current state.
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Namely: labels, type parameters, bindings in patterns, parameter names in functions without body.
All of these do not need hygiene after lowering to HIR, only span locations.
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Our implementation ends up changing the `PatKind::Range` variant in the
AST to take a `Spanned<RangeEnd>` instead of just a `RangeEnd`, because
the alternative would be to try to infer the span of the range operator
from the spans of the start and end subexpressions, which is both
hideous and nontrivial to get right (whereas getting the change to the
AST right was a simple game of type tennis).
This is concerning #51043.
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These were stabilized in March 2018's #47813, and are the Preferred Way
to Do It going forward (q.v. #51043).
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Now that `..=` inclusive ranges are stabilized, people probably
shouldn't be using `...` even in patterns, even if it's still legal
there (see #51043). To avoid drawing attention to `...` being a real
thing, let's reword this message to just say "unexpected token" rather
"cannot be used in expressions".
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async/await
This PR implements `async`/`await` syntax for `async fn` in Rust 2015 and `async` closures and `async` blocks in Rust 2018 (tracking issue: https://github.com/rust-lang/rust/issues/50547). Limitations: non-`move` async closures with arguments are currently not supported, nor are `async fn` with multiple different input lifetimes. These limitations are not fundamental and will be removed in the future, however I'd like to go ahead and get this PR merged so we can start experimenting with this in combination with futures 0.3.
Based on https://github.com/rust-lang/rust/pull/51414.
cc @petrochenkov for parsing changes.
r? @eddyb
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Rollup of 6 pull requests
Successful merges:
- #51158 (Mention spec and indented blocks in doctest docs)
- #51629 (Do not consume semicolon twice while parsing local statement)
- #51637 (Update zx_cprng_draw_new on Fuchsia)
- #51664 (make more libsyntax methods public)
- #51666 (Disable probestack when GCOV profiling is being used)
- #51703 (Recognize the extra "LLVM tools versions" argument to build-manifest.)
Failed merges:
r? @ghost
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Only display the "remove this comma" suggestion when followed by an identifier
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