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Rename IndexVec::lastlast_index #109718

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Mar 29, 2023
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As I've been trying to replace a Vec with an IndexVec, having last exist on both but returning very different types makes the transition a bit awkward -- the errors are later, where you get things like "there's no ty method on mir::Field" rather than a more localized error like "hey, there's no last on IndexVec".

So I propose renaming last to last_index to help distinguish Vec::last, which returns an element, and IndexVec::last_index, which returns an index.

(Similarly, Iterator::last also returns an element, not an index.)

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rustbot commented Mar 29, 2023

r? @petrochenkov

(rustbot has picked a reviewer for you, use r? to override)

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative labels Mar 29, 2023
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rustbot commented Mar 29, 2023

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

As I've been trying to replace a `Vec` with an `IndexVec`, having `last` exist on both but returning very different types makes the transition a bit awkward -- the errors are later, where you get things like "there's no `ty` method on `mir::Field`" rather than a more localized error like "hey, there's no `last` on `IndexVec`".

So I propose renaming `last` to `last_index` to help distinguish `Vec::last`, which returns an element, and `IndexVec::last_index`, which returns an index.

(Similarly, `Iterator::last` also returns an element, not an index.)
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rustbot commented Mar 29, 2023

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

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r? Nilstrieb
r=me, the renaming makes a lot of sense

@rustbot rustbot assigned Noratrieb and unassigned petrochenkov Mar 29, 2023
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CI came in clean, so
@bors r=Nilstrieb

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bors commented Mar 29, 2023

📌 Commit 843c5e3 has been approved by Nilstrieb

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 29, 2023
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@bors r+ rollup

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bors commented Mar 29, 2023

💡 This pull request was already approved, no need to approve it again.

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bors commented Mar 29, 2023

📌 Commit 843c5e3 has been approved by Nilstrieb

It is now in the queue for this repository.

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oh, GitHub didn't refresh for me :D

bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 29, 2023
Rollup of 7 pull requests

Successful merges:

 - rust-lang#108335 (rustdoc + rustdoc-json support for `feature(non_lifetime_binders)`)
 - rust-lang#109534 (rustdoc: Unsupport importing `doc(primitive)` and `doc(keyword)` modules)
 - rust-lang#109659 (llvm-wrapper: adapt for LLVM API change)
 - rust-lang#109664 (Use span of placeholders in format_args!() expansion.)
 - rust-lang#109683 (Check for overflow in `assemble_candidates_after_normalizing_self_ty`)
 - rust-lang#109713 (Fix mismatched punctuation in Debug impl of AttrId)
 - rust-lang#109718 (Rename `IndexVec::last` → `last_index`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 1415756 into rust-lang:master Mar 29, 2023
@rustbot rustbot added this to the 1.70.0 milestone Mar 29, 2023
@scottmcm scottmcm deleted the indexvec-last branch March 29, 2023 16:08
@lcnr lcnr removed the WG-trait-system-refactor The Rustc Trait System Refactor Initiative label Apr 10, 2023
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6 participants