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Rollup of 7 pull requests #78178

Merged
merged 25 commits into from Oct 21, 2020
Merged

Rollup of 7 pull requests #78178

merged 25 commits into from Oct 21, 2020

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JohnTitor
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Successful merges:

Failed merges:

r? @ghost

m-ou-se and others added 25 commits October 8, 2020 23:51
Co-authored-by: Peter Todd <pete@petertodd.org>
Co-authored-by: David Tolnay <dtolnay@gmail.com>
For example, if you had this code:

    fn foo(x: i32, y: f32) -> f32 {
        x * y
    }

You would get this error:

    error[E0277]: cannot multiply `f32` to `i32`
     --> src/lib.rs:2:7
      |
    2 |     x * y
      |       ^ no implementation for `i32 * f32`
      |
      = help: the trait `Mul<f32>` is not implemented for `i32`

However, that's not usually how people describe multiplication. People
usually describe multiplication like how the division error words it:

    error[E0277]: cannot divide `i32` by `f32`
     --> src/lib.rs:2:7
      |
    2 |     x / y
      |       ^ no implementation for `i32 / f32`
      |
      = help: the trait `Div<f32>` is not implemented for `i32`

So that's what this change does. It changes this:

    error[E0277]: cannot multiply `f32` to `i32`
     --> src/lib.rs:2:7
      |
    2 |     x * y
      |       ^ no implementation for `i32 * f32`
      |
      = help: the trait `Mul<f32>` is not implemented for `i32`

To this:

    error[E0277]: cannot multiply `i32` by `f32`
     --> src/lib.rs:2:7
      |
    2 |     x * y
      |       ^ no implementation for `i32 * f32`
      |
      = help: the trait `Mul<f32>` is not implemented for `i32`
Previously the title would be

    lib.rs.html -- source

if `lib.rs` was the actual source filename. Now the title is

    lib.rs – source

(note the en dash).
Even in the PR that introduced this comment, it does not seem like these locals are actually ignored -- just their `source_info` is adjusted:
https://github.com/rust-lang/rust/pull/44700/files#diff-ae2f3c7e2f9744f7ef43e96072b10e98d4e3fe74a3a399a3ad8a810fbe56c520R139
…, r=dtolnay

Add Pin::static_ref, static_mut.

This adds `Pin::static_ref` and `Pin::static_mut`, which convert a static reference to a pinned static reference.

Static references are effectively already pinned, as what they refer to has to live forever and can never be moved.

---

Context: I want to update the `sys` and `sys_common` mutexes/rwlocks/condvars to use `Pin<&self>` in their functions, instead of only warning in the unsafety comments that they may not be moved. That should make them a little bit less dangerous to use. Putting such an object in a `static` (e.g. through `sys_common::StaticMutex`) fulfills the requirements about never moving it, but right now there's no safe way to get a `Pin<&T>` to a `static`. This solves that.
BTreeMap: split off most code of remove and split_off

Putting map.rs on a diet, in addition to rust-lang#77851.
r? @dtolnay
…or, r=estebank

Improve wording of "cannot multiply" type error

For example, if you had this code:

    fn foo(x: i32, y: f32) -> f32 {
        x * y
    }

You would get this error:

    error[E0277]: cannot multiply `f32` to `i32`
     --> src/lib.rs:2:7
      |
    2 |     x * y
      |       ^ no implementation for `i32 * f32`
      |
      = help: the trait `Mul<f32>` is not implemented for `i32`

However, that's not usually how people describe multiplication. People
usually describe multiplication like how the division error words it:

    error[E0277]: cannot divide `i32` by `f32`
     --> src/lib.rs:2:7
      |
    2 |     x / y
      |       ^ no implementation for `i32 / f32`
      |
      = help: the trait `Div<f32>` is not implemented for `i32`

So that's what this change does. It changes this:

    error[E0277]: cannot multiply `f32` to `i32`
     --> src/lib.rs:2:7
      |
    2 |     x * y
      |       ^ no implementation for `i32 * f32`
      |
      = help: the trait `Mul<f32>` is not implemented for `i32`

To this:

    error[E0277]: cannot multiply `i32` by `f32`
     --> src/lib.rs:2:7
      |
    2 |     x * y
      |       ^ no implementation for `i32 * f32`
      |
      = help: the trait `Mul<f32>` is not implemented for `i32`
…=jyn514

rustdoc: Show the correct source filename in page titles, without `.html`

Previously the title would be

    lib.rs.html -- source

if `lib.rs` was the actual source filename. Now the title is

    lib.rs - source
fix static_ptr_ty for foreign statics

Cc rust-lang#74840

This does not fix that issue but fixes a problem in `static_ptr_ty` that we noticed while discussing that issue. I also added and updated a few comments. The one about `internal` locals being ignored does not seem to have been true [even in the commit that introduced it](https://github.com/rust-lang/rust/pull/44700/files#diff-ae2f3c7e2f9744f7ef43e96072b10e98d4e3fe74a3a399a3ad8a810fbe56c520R139).

r? @oli-obk
@JohnTitor
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@bors r+ rollup=never p=5
@rustbot modify labels: rollup

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bors commented Oct 21, 2020

📌 Commit de24210 has been approved by JohnTitor

@rustbot rustbot added the rollup A PR which is a rollup label Oct 21, 2020
@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 Oct 21, 2020
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bors commented Oct 21, 2020

⌛ Testing commit de24210 with merge 1935645...

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bors commented Oct 21, 2020

☀️ Test successful - checks-actions, checks-azure
Approved by: JohnTitor
Pushing 1935645 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 21, 2020
@bors bors merged commit 1935645 into rust-lang:master Oct 21, 2020
@rustbot rustbot added this to the 1.49.0 milestone Oct 21, 2020
@JohnTitor JohnTitor deleted the rollup-dslazzj branch October 21, 2020 17:25
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9 participants