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Rollup of 10 pull requests #82262

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@rustbot modify labels: rollup

Create a similar rollup

matthewjasper and others added 30 commits February 13, 2021 19:29
Also make sure that type arguments of associated types are printed in
some error messages.
…-obk

name async generators something more human friendly in type error diagnostic

fixes rust-lang#81457

Some details:

1. I opted to load the generator kind from the hir in TyCategory. I also use 1 impl in the hir for the descr
2. I named both the source of the future, in addition to the general type (`future`), not sure what is preferred
3. I am not sure what is required to make sure "generator" is not referred to anywhere. A brief `rg "\"generator\"" showed me that most diagnostics correctly distinguish from generators and async generator, but the `descr` of `DefKind` is pretty general (not sure how thats used)
4. should the descr impl of AsyncGeneratorKind use its display impl instead of copying the string?
… r=Mark-Simulacrum

[libtest] Run the test synchronously when hitting thread limit

libtest currently panics if it hits the thread limit. This often results in spurious test failures (<code>thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 11, kind: WouldBlock, message: "Resource temporarily unavailable" }'</code> ... `error: test failed, to rerun pass '--lib'`). This PR makes it continue to run the test synchronously if it runs out of threads.

Closes rust-lang#78165.

`@rustbot` label: A-libtest T-libs
…h726

Ensure valid TraitRefs are created for GATs

This fixes `ProjectionTy::trait_ref` to use the correct substs. Places that need all of the substs have been updated to not use `trait_ref`.

r? ```@jackh726```
const_generics: Dont evaluate array length const when handling yet another error

Same ICE as rust-lang#82009 except triggered by a different error.
cc `@lcnr`
r? `@varkor`
…n, r=petrochenkov

In some limited cases, suggest `where` bounds for non-type params

Partially address rust-lang#81971.
…=varkor

Replace if-let and while-let with `if let` and `while let`

This pull request replaces if-let and while-let with `if let` and `while let`.

closes rust-lang#82205
Make sure pdbs are copied along with exe and dlls when bootstrapping

This makes it easier to find the pdbs when wanting to debug the compiler on Windows.
avoid converting types into themselves (clippy::useless_conversion)
…549, r=GuillaumeGomez

Add long explanation for E0549

Helps with rust-lang#61137
…rkor

Optimize counting digits in line numbers during error reporting

Replaces `.to_string().len()` with simple loop and integer division, which avoids an unnecessary allocation.

Although I couldn't figure out how to directly profile `rustc`'s error reporting, I ran a microbenchmark on my machine (2.9 GHz Dual-Core Intel Core i5) on the two strategies for `0..100_000`, and the results seem promising:
```
test to_string_len ... bench:  12,124,792 ns/iter (+/- 700,652)
test while_loop    ... bench:      30,333 ns/iter (+/- 562)
```
The x86_64 disassembly reduces integer division to a multiplication + shift, so I don't think there's any problems with using integer division.

For more (micro)optimization, it would be nice if we could avoid the initial check to see if the line number is nonzero, but I don't think `self.get_max_line_num(span, children)` _guarantees_ a nonzero line number.
@rustbot rustbot added the rollup A PR which is a rollup label Feb 18, 2021
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@bors r+ rollup=never p=5

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bors commented Feb 18, 2021

📌 Commit d744e0b has been approved by Dylan-DPC

@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Feb 18, 2021
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The job mingw-check failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)
configure: rust.channel         := nightly
configure: rust.debug-assertions := True
configure: llvm.assertions      := True
configure: dist.missing-tools   := True
configure: build.configure-args := ['--enable-sccache', '--disable-manage-submodu ...
configure: writing `config.toml` in current directory
configure: 
configure: run `python /checkout/x.py --help`
configure: 
---
Checking which error codes lack tests...
Found 436 error codes
Found 0 error codes with no tests
Done!
tidy error: /checkout/compiler/rustc_hir/src/hir.rs: too many lines (3006) (add `// ignore-tidy-filelength` to the file to suppress this error)
some tidy checks failed

command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "/checkout/obj/build"
expected success, got: exit code: 1

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@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Feb 18, 2021
@Dylan-DPC-zz Dylan-DPC-zz deleted the rollup-ozqifd3 branch February 18, 2021 15:57
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