Shorten names of some compiler generated artifacts.
This PR makes the compiler mangle codegen unit names by default. The name of every codegen unit name will now be a random string of 16 characters. It also makes the file extensions of some intermediate compiler products shorter. Hopefully, these changes will reduce the pressure on tools with path length restrictions like buildbot. The change should also solve problems with case-insensitive file system.
cc #47186 and #47222
r? @alexcrichton
This test fails on APFS filesystems with the following error:
mkdir: /Users/ryan/Code/rust/build/x86_64-apple-darwin/test/run-make/linker-output-non-utf8.stage2-x86_64-apple-darwin/zzz�: Illegal byte sequence
This is due to APFS now requiring that all paths are valid UTF-8. As
APFS will be the default filesystem for all new Darwin-based systems the
most straightforward fix is to skip this test on Darwin as well as
Windows.
According to http://www.musl-libc.org/download.html:
This release corrects regressions in glob() and armv4t build failure
introduced in the previous release, and includes an important bug fix
for posix_spawnp in the presence of a large PATH environment variable.
Replace empty array hack with repr(align)
As a side effect, this fixes the warning about repr(C, simd) that has been reported during x86_64 windows builds since #47111 (see also: #47103)
r? @alexcrichton
fix the doc-comment-decoration-trimming edge-case rustdoc ICE
This `horizontal_trim` function strips the leading whitespace from
doc-comments that have a left-asterisk-margin:
```
/**
* You know what I mean—
*
* comments like this!
*/
```
The index of the column of asterisks is `i`, and if trimming is deemed
possible, we slice each line from `i+1` to the end of the line. But if, in
particular, `i` was 0 _and_ there was an empty line (as in the example
given in the reporting issue), we ended up panicking trying to slice an
empty string from 0+1 (== 1).
Let's tighten our check to say that we can't trim when `i` is even the same
as the length of the line, not just when it's greater. (Any such cases
would panic trying to slice `line` from `line.len()+1`.)
Resolves#47197.
Add help message for incorrect pattern syntax
When I was getting started with rust I often made the mistake of using `||` instead of `|` to match multiple patterns and spent a long time staring at my code wondering what was wrong.
for example:
```
fn main() {
let x = 1;
match x {
1 || 2 => println!("1 or 2"),
_ => println!("Something else"),
}
}
```
If you compile this with current rustc you will see
```
error: expected one of `...`, `..=`, `..`, `=>`, `if`, or `|`, found `||`
--> test.rs:5:11
|
5 | 1 || 2 => println!("1 or 2"),
| -^^ unexpected token
| |
| expected one of `...`, `..=`, `..`, `=>`, `if`, or `|` here
error: aborting due to previous error
```
With my proposed change it will show:
```
error: unexpected token `||` after pattern
--> test.rs:5:11
|
5 | 1 || 2 => println!("1 or 2"),
| ^^
|
= help: did you mean to use `|` to specify multiple patterns instead?
error: aborting due to previous error
```
Make normalize_and_test_predicates into a query
From #44891.
I'm not real solid on how `dep_graph` stuff works, but if a node is going to have a key (again, not sure how important that is), then the key needs to be `Copy`. So since `normalize_and_test_predicates` only had one out-of-module use, I changed that call site to use a new function, `substitute_normalize_and_test_predicates` which is the query and enables having the arguments be `Copy`. Hopefully this makes sense.
r? @nikomatsakis
and/or @michaelwoerister
- Recover from struct parse error on match and point out missing match
body.
- Point at struct when finding non-identifier while parsing its fields.
- Add label to "expected identifier, found {}" error.
Provide suggestion when trying to use method on numeric literal
New output:
```
error[E0688]: can't call method `powi` on ambiguous numeric type `{float}`
--> $DIR/method-on-ambiguous-numeric-type.rs:12:17
|
12 | let x = 2.0.powi(2);
| ^^^^
help: you must specify a concrete type for this numeric value, like `f32`
|
12 | let x = 2.0_f32.powi(2);
| ^^^^^^^
```
Previous output:
```
error[E0599]: no method named `powi` found for type `{float}` in the current scope
--> src/main.rs:12:17
|
12 | let x = 2.0.powi(2);
| ^^^^
|
= help: items from traits can only be used if the trait is in scope
help: the following trait is implemented but not in scope, perhaps add a `use` for it:
|
11 | use core::num::Float;
|
```
Fix#40985.
The `#[simd]` attribute has been deprecated since c8b6d5b23c back in 2015. Any nightly crates using it have had ample time to switch to `#[repr(simd)]`, and if they didn't they're likely broken by now anyway.
rustdoc: Add missing src links for generic impls on trait pages
`implementor2item` would return `None` for generic impls so instead this clones the entire `clean::Item` into the `implementors` map which simplifies some code.
