Add `Noted` marker struct that implements `EmissionGuarantee` so that
`emit_note` and `create_note` can be implemented for struct diagnostics.

Signed-off-by: David Wood <david.wood@huawei.com>

Implement `IntoDiagnosticArg` for `&'a T` when `T` implements
`IntoDiagnosticArg` and `Clone`. Makes it easier to write diagnostic
structs that borrow something which implements `IntoDiagnosticArg`.

Signed-off-by: David Wood <david.wood@huawei.com>

Forward the `Display` implementation for `CrateType` to
`IntoDiagnosticArg` so that it can be used in diagnostic structs.

Signed-off-by: David Wood <david.wood@huawei.com>

Forward the `Display` implementation for `CrateType` to
`IntoDiagnosticArg` so that it can be used in diagnostic structs.

Signed-off-by: David Wood <david.wood@huawei.com>

Apply the diagnostic migration lint to more functions on `Session`.

Signed-off-by: David Wood <david.wood@huawei.com>

Migrate the `rustc_incremental` crate's diagnostics to translatable
diagnostic structs.

Signed-off-by: David Wood <david.wood@huawei.com>

This CL modifies the handing of env vars during the bootstrap process in
two ways:
1. Replaces '-' characters with '_' characters in target names to
   increase compatibility with different shells
2. Passes Stage0 snapshot compiler related env vars to early invocations
   of Cargo

… r=compiler-errors

incremental: migrate diagnostics

- Apply the diagnostic migration lints to more functions on `Session`, namely: `span_warn`, `span_warn_with_code`, `warn` `note_without_error`, `span_note_without_error`, `struct_note_without_error`.
- Add impls of `IntoDiagnosticArg` for `std::io::Error`, `std::path::Path` and `std::path::PathBuf`.
- Migrate the `rustc_incremental` crate's diagnostics to translatable diagnostic structs.

r? `@compiler-errors`
cc rust-lang#100717

…nkov

change AccessLevels representation

Part of RFC (rust-lang#48054). This patch implements effective visibility table with basic methods and change AccessLevels table representation according to it.

r? `@petrochenkov`

Improve handing of env vars during bootstrap process

This CL modifies the handing of env vars during the bootstrap process in two ways:
1. Replaces '-' characters with '_' characters in target names to increase compatibility with different shells
2. Passes Stage0 snapshot compiler related env vars to early invocations of Cargo

…trochenkov

cache `collect_trait_impl_trait_tys`

Micro-optimization for RPITITs

…s, r=fee1-dead

Constify impl Fn* &(mut) Fn*

Tracking Issue: [101803](rust-lang#101803)

Feature gate: `#![feature(const_fn_trait_ref_impls)]`

This feature allows using references to Fn* Items as Fn* Items themself in a const context.

…aumeGomez

Replace `check_missing_items.py` with `jsondoclint`

[zulip discussion](https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/check_missing_items.2Epy.20Replacement.2E)

check_missing_items.py was a python script that checked rustdoc json output to make sure all the Id's referenced existed in the JSON index. This PR replaces that with a rust binary (`jsondoclint`) that does the same thing.

### Motivation

1. Easier to change when `rustdoc-json-types` changes, as `jsondoclint` uses the types directly.
2. Better Errors:
    - Multiple Errors can be emited for a single crate
    - Errors can say where in JSON they occored
        ```
        2:2889:408 not in index or paths, but refered to at '.index."2:2888:104".inner.items[0]'
        2:2890:410 not in index or paths, but refered to at '.index."2:2888:104".inner.items[1]'
        ```
3. Catches more bugs.
    - Because matches are exaustive, all posible variants considered for enums
    - All Id's checked
    - Has already found rust-lang#101770, rust-lang#101199 and rust-lang#100973
    - Id type is also checked, so the Id's in a structs fields can only be field items.
4. Allows the possibility of running from `rustdoc::json`, which we should do in a crator run at some point.

cc `@CraftSpider`

r? `@GuillaumeGomez`