Adding compile fail test for staged_api feature
Issue #39059
r? @est31
@est31 running the tests for this feature fails. Is that expected since this is the `compile-fail`suite?
I copied this test from the run-pass suite: `rust/src/test/run-pass/reachable-unnameable-type-alias.rs`. What are the differences between these suites in operation and why they are used?
[MIR] SwitchInt Everywhere
Something I've been meaning to do for a very long while. This PR essentially gets rid of 3 kinds of conditional branching and only keeps the most general one - `SwitchInt`. Primary benefits are such that dealing with MIR now does not involve dealing with 3 different ways to do conditional control flow. On the other hand, constructing a `SwitchInt` currently requires more code than what previously was necessary to build an equivalent `If` terminator. Something trivially "fixable" with some constructor methods somewhere (MIR needs stuff like that badly in general).
Some timings (tl;dr: slightly faster^1 (unexpected), but also uses slightly more memory at peak (expected)):
^1: Not sure if the speed benefits are because of LLVM liking the generated code better or the compiler itself getting compiled better. Either way, its a net benefit. The CORE and SYNTAX timings done for compilation without optimisation.
```
AFTER:
Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 31.50 secs
Finished release [optimized] target(s) in 31.42 secs
Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 439.56 secs
Finished release [optimized] target(s) in 435.15 secs
CORE: 99% (24.81 real, 0.13 kernel, 24.57 user); 358536k resident
CORE: 99% (24.56 real, 0.15 kernel, 24.36 user); 359168k resident
SYNTAX: 99% (49.98 real, 0.48 kernel, 49.42 user); 653416k resident
SYNTAX: 99% (50.07 real, 0.58 kernel, 49.43 user); 653604k resident
BEFORE:
Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 31.84 secs
Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Finished release [optimized] target(s) in 451.17 secs
CORE: 99% (24.66 real, 0.20 kernel, 24.38 user); 351096k resident
CORE: 99% (24.36 real, 0.17 kernel, 24.18 user); 352284k resident
SYNTAX: 99% (52.24 real, 0.56 kernel, 51.66 user); 645544k resident
SYNTAX: 99% (51.55 real, 0.48 kernel, 50.99 user); 646428k resident
```
cc @nikomatsakis @eddyb
macros: fix inert attributes from `proc_macro_derives` with `#![feature(proc_macro)]`
This PR refactors collection of `proc_macro_derive` invocations to fix#39347.
After this PR, the input to a `#[proc_macro_derive]` function no longer sees `#[derive]`s on the underlying item. For example, consider:
```rust
extern crate my_derives;
use my_derives::{Trait, Trait2};
#[derive(Copy, Clone)]
#[derive(Trait)]
#[derive(Trait2)]
struct S;
```
Today, the input to the `Trait` derive is `#[derive(Copy, Clone, Trait2)] struct S;`, and the input to the `Trait2` derive is `#[derive(Copy, Clone)] struct S;`. More generally, a `proc_macro_derive` sees all builtin derives, as well as all `proc_macro_derive`s listed *after* the one being invoked.
After this PR, both `Trait` and `Trait2` will see `struct S;`.
This is a [breaking-change], but I believe it is highly unlikely to cause breakage in practice.
r? @nrc
Stabilize static lifetime in statics
Stabilize the "static_in_const" feature. Blockers before this PR can be merged:
* [x] The [FCP with inclination to stabilize](https://github.com/rust-lang/rust/issues/35897#issuecomment-270441437) needs to be over. FCP lasts roughly three weeks, so will be over at Jan 25, aka this thursday.
* [x] Documentation needs to be added (#37928)
Closes#35897.
Improve error message for uninferrable types #38812
Hello,
I tried to improve the error message for uninferrable types. The error code is `E0282`.
```rust
error[E0282]: type annotations needed
--> /home/cengizIO/issue38812.rs:2:11
|
2 | let x = vec![];
| - ^^^^^^ cannot infer type for `T`
| |
| consider giving `x` a type
|
= note: this error originates in a macro outside of the current crate
```
and
```rust
error[E0282]: type annotations needed
--> /home/cengizIO/issue38812.rs:2:15
|
2 | let (x,) = (vec![],);
| ---- ^^^^^^ cannot infer type for `T`
| |
| consider giving a type to pattern
|
= note: this error originates in a macro outside of the current crate
```
Rust compiler now tries to find uninferred `local`s with type `_` and adds them into the error message.
I'm probably wrong on wording that I used. Please feel free to suggest better alternatives.
Thanks @nikomatsakis for mentoring 🍺
Any comments/feedback is more than welcome!
Thank you
make lifetimes that only appear in return type early-bound
This is the full and proper fix for #32330. This also makes some effort to give a nice error message (as evidenced by the `ui` test), sending users over to the tracking issue for a fuller explanation and offering a `--explain` message in some cases.
This needs a crater run before we land.
r? @arielb1
This is the full and proper fix for #32330. This also makes some effort
to give a nice error message (as evidenced by the `ui` test), sending
users over to the tracking issue for a full explanation.
Uninhabited while-let pattern fix
This fix makes it so while-let with an unsatisfiable pattern raises a correct warning rather than an incorrect error.
Expand derive macros in the MacroExpander
This removes the expand_derives function, and sprinkles the functionality throughout the Invocation Collector, Expander and Resolver.
Fixes https://github.com/rust-lang/rust/issues/39326
r? @jseyfried
Add warning for () to ! switch
With feature(never_type) enabled diverging type variables will default to `!` instead of `()`. This can cause breakages where a trait is resolved on such a type.
This PR emits a future-compatibility warning when it sees this happen.
Implement kind="static-nobundle" (RFC 1717)
This implements the "static-nobundle" library kind (last item from #37403).
Rustc handles "static-nobundle" libs very similarly to dylibs, except that on Windows, uses of their symbols do not get marked with "dllimport". Which is the whole point of this feature.
Previously, the note/message for the source of a lint being the command
line unconditionally named the individual lint, even if the actual
command specified a lint group (e.g., `-D warnings`); here, we take note
of the actual command options so we can be more specific.
This remains in the matter of #36846.
Warning or error messages set via a lint group attribute
(e.g. `#[deny(warnings)]`) should still make it clear which individual
lint (by name) was triggered, similarly to how we include "on by
default" language for default lints. This—and, while we're here, the
existing "on by default" language—can be tucked into a note rather than
cluttering the main error message. This occasions the slightest of
refactorings (we now have to get the diagnostic-builder with the main
message first, before matching on the lint source).
This is in the matter of #36846.
