…for "does not live long enough" error

This has bothered me for a while. It's such a small nit, but...

…int` to `bound`

Fixes rust-lang#67710

Previously, we were not calling `super_place`, which resulted in us
failing to update any local references that occur in
ProjectionElem::Index. This caused the post-inlining MIR to contain a
reference to a local ID from the inlined callee, leading to an ICE
due to a type mismatch.

…er the compiler.

Co-authored-by: Centril <twingoow@gmail.com>

Co-authored-by: Centril <twingoow@gmail.com>

Co-authored-by: Centril <twingoow@gmail.com>

Eg. mem::replace()

…imit, r=Mark-Simulacrum

Allow for setting a ThinLTO import limit during bootstrap

The benchmarks in rust-lang#66625 have shown that a lower ThinLTO import limit can be a net win for bootstrap times. This PR:
- exposes the setting to `config.toml`,
- defaults to a lower limit if `incremental = true` in `config.toml`, and
- sets a lower limit for `x86_64-gnu-llvm-7` CI image in order to make the jobs complete more quickly (which remains to be tested).

This setting will affect how the compiler and it's tools are compiled. It will not affect the settings the compiler uses when compiling user code.

r? @pietroalbini
cc @rust-lang/infra

…long-enough, r=estebank

Suggest adding a lifetime constraint for opaque type

Fixes rust-lang#67577, where code like this:

```
struct List {
  data: Vec<String>,
}
impl List {
  fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> {
    self.data.iter().filter(|s| s.starts_with(prefix)).map(|s| s.as_ref())
  }
}
```

will show this error:
```
   Compiling playground v0.0.1 (/playground)
error[E0597]: `prefix` does not live long enough
 --> src/lib.rs:6:47
  |
5 |   fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> {
  |                   -- lifetime `'a` defined here     --------------------------- opaque type requires that `prefix` is borrowed for `'a`
...
```

but without suggesting the lovely `help: you can add a constraint..`.

r? @estebank

…imulacrum

allow rustfmt key in [build] section

Permit using `rustfmt` in `config.toml`. It will allow to not download `rustfmt` binary, which is not possible for at least some tiers-3 platforms.

Fixes: rust-lang#67624

r? @Mark-Simulacrum

Less-than is asymmetric, not antisymmetric

This has bothered me for a while. It's such a small nit, but...

…lett

Add missing links for insecure_time

…, r=Centril

Warn for bindings named same as variants when matching against a borrow

Fixes rust-lang#67776

…sleywiser

Ensure that we process projections during MIR inlining

Fixes rust-lang#67710

Previously, we were not calling `super_place`, which resulted in us
failing to update any local references that occur in
ProjectionElem::Index. This caused the post-inlining MIR to contain a
reference to a local ID from the inlined callee, leading to an ICE
due to a type mismatch.

Use drop instead of the toilet closure `|_| ()`

…r=Dylan-DPC

Clean up err codes

r? @Dylan-DPC

…steveklabnik

Minor: change take() docs grammar to match other docs

Eg. mem::replace()