The modified code to handle parsing raw strings didn't properly account for the case where there was no "#" on either end and erroneously reported this strings as complete. This lead to a panic trying to read off the end of the file.

This commit adds a STILL_FURTHER_SPECIALIZABLE flag to `TypeFlags`
which replaces `needs_infer` and `needs_subst` in `Instance::resolve`
and `assemble_candidates_from_impls.`

Signed-off-by: David Wood <david@davidtw.co>

Implement Hash for Infallible

https://www.reddit.com/r/rust/comments/fmllgx/never_crate_stable_alternative_to/ lists not implementing `Hash` as a reason for the `never` crate. I see no reason not to implement `Hash` for `Infallible`, so might as well do it.

No changes necessary for `!`, because `!` already implements `Hash` (see rust-lang#51404).

… r=estebank

parse: recover on `const fn()` / `async fn()`

Recover on `const fn()` and `async fn()` function pointers, suggesting to remove the qualifier.
For example:
```
error: an `fn` pointer type cannot be `async`
  --> $DIR/recover-const-async-fn-ptr.rs:6:11
   |
LL | type T3 = async fn();
   |           -----^^^^^
   |           |
   |           `async` because of this
   |           help: remove the `async` qualifier
```

r? @estebank

Renamed `PerDefTables` to `Tables`

Originally suggested by @eddyb

Update cargo

8 commits in 8a0d4d9c9abc74fd670353094387d62028b40ae9..6e07d2dfb7fc87b1c9489de41da4dafa239daf03
2020-03-24 17:57:04 +0000 to 2020-03-31 03:22:39 +0000
- Fix man page typo for "Owner Options". (rust-lang/cargo#8057)
- enable progress bar on all UNIX platforms (rust-lang/cargo#8054)
- Squelch some rustdoc warnings. (rust-lang/cargo#8052)
- Remove clippy tests. (rust-lang/cargo#8053)
- Fix -Zfeatures=itarget with certain host dependencies (rust-lang/cargo#8048)
- Checking for binary that is built as an implicit dependency of an integration test. (rust-lang/cargo#8020)
- Use stabilized version of rustdoc's --crate-version (rust-lang/cargo#8039)
- Remove the `git-checkout` subcommand. (rust-lang/cargo#8040)

…ulacrum

Remove some reexports in `rustc_middle`

This will help get these imports out of the way of detecting the true dependencies in and out to `rustc_middle`, thereby helping future work towards rust-lang#65031.

…-specializable, r=eddyb

add `STILL_FURTHER_SPECIALIZABLE` flag

Contributes to rust-lang#70285.

This PR adds a `STILL_FURTHER_SPECIALIZABLE` flag to `TypeFlags`
which replaces `needs_infer` and `needs_subst` in `Instance::resolve`
and `assemble_candidates_from_impls`.

r? @eddyb

Add missing markdown rust annotation

…=petrochenkov

Handle unterminated raw strings with no #s properly

The modified code to handle parsing raw strings didn't properly account for the case where there was no "#" on either end and erroneously reported this strings as complete. This lead to a panic trying to read off the end of the file.

Fixes rust-lang#70677

r? @petrochenkov

cc @Centril