Most notably, this commit changes the `pub use crate::*;` in that file
to `use crate::*;`. This requires a lot of `use` items in other crates
to be adjusted, because everything defined within `rustc_span::*` was
also available via `rustc_span::source_map::*`, which is bizarre.

The commit also removes `SourceMap::span_to_relative_line_string`, which
is unused.

…dnet

Fix `dbg_macro` semi span calculation

`span_including_semi` was using a `BytePos` to index into a file's source which happened to work because the root file of the test started at `BytePos` 0, it didn't work for other files

changelog: none

`rustc_span` cleanups

Just some things I found while looking over this crate.

r? `@oli-obk`

[`unused_enumerate_index`]: don't ICE on empty tuples

Fixes rust-lang#11755

changelog: [`unused_enumerate_index`]: don't ICE on empty tuples

I'm going to nominate for beta backport because the code that is needed to trigger this seems likely to occur in real code
`@rustbot` label +beta-nominated

…onf`

update references of old `msrvs` and `conf` paths

In rust-lang#11685, `clippy_lints::utils::conf` and `clippy_utils::msrvs` were moved to a separate `clippy_config` crate.
I noticed that not all references to those paths were updated, so this small PR intends to fix those.

changelog: none

Make SpanlessEq more consistent

1) Remove wildcard as requested in rust-lang/rust-clippy#10267.
2) Implement `hir_utils::eq_expr` for `ExprKind::Closure`, `ExprKind::ConstBlock`, `ExprKind::InlineAsm` and `ExprKind::Yield`.
3) Reorder branches of `hir_utils::eq_expr` to be in alphabetical order.

---
changelog: none

Fixes: rust-lang#11714
changelog: [`arc_with_non_send_sync`]: Suggest RC over unsafe impl

Co-authored-by: Alejandra González <blyxyas@gmail.com>

[arc_with_non_send_sync] Improve suggested resolution

Fixes: rust-lang#11714

Improved the lint message for [`arc_with_non_send_sync`] to suggest using `RC` unless user needs an Arc, then suggests wrapping in a mutex, and then suggests implementing `Sync` and `Send`.

---

changelog: [`arc_with_non_send_sync`]: Suggest RC over unsafe impl of Send and Sync

fixes: rust-lang#11775

current state: indiscriminately emits the lint for mod files in tests.

The following

tests/
  common/
    mod.rs
  test.rs

is a common pattern for code shared across the tests and is suggested in
the rust book. The change adds an additional check to verify that the
mod file is not in tests.

changelog: Fix [`mod_module_files`]: false positive for mod files in
tests folder

[`mod_module_files`] Don't emit lint for mod.rs in tests

fixes: rust-lang#11775

current state: indiscriminately emits the lint for mod files in tests.

The following

```
tests/
  common/
    mod.rs
  test.rs
```

is a common pattern for code shared across the tests and is suggested in the rust book. The change adds an additional check to verify that the mod file is not in tests.

changelog: Fix [`mod_module_files`]: false positive for mod files in tests folder