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make Debug impl for ascii::Char match that of char #115434

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merged 1 commit into from
Sep 17, 2023

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@soqb soqb commented Sep 1, 2023

Objective

use a more recognisable format for the Debug impl on ascii::Char than the derived one based off the enum variants. The alogorithm used is the following:

  • escape ascii::Char::{Null, CharacterTabulation, CarraigeReturn, LineFeed, ReverseSolidus, Apostrophe} to '\0', '\t', '\r', '\n', '\\' and '\'' respectively. these are the same escape codes as <char as Debug>::fmt uses.
  • if u8::is_ascii_control is false, print the character wrapped in single quotes.
  • otherwise, print in the format '\xAB' where A and B are the hex nibbles of the byte. (char uses unicode escapes and this seems like the corresponding ascii format).

Tracking issue: #110998

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rustbot commented Sep 1, 2023

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @joshtriplett (or someone else) soon.

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-waiting-on-review and S-waiting-on-author) stays updated, invoking these commands when appropriate:

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Sep 1, 2023
@dtolnay dtolnay added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. and removed T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Sep 16, 2023
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Thanks!

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dtolnay commented Sep 16, 2023

@bors r+

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bors commented Sep 16, 2023

📌 Commit 9c0e5eb has been approved by dtolnay

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 Sep 16, 2023
@dtolnay dtolnay assigned dtolnay and unassigned joshtriplett Sep 16, 2023
bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 17, 2023
Rollup of 6 pull requests

Successful merges:

 - rust-lang#114965 (Remove Drop impl of mpsc Receiver and (Sync)Sender)
 - rust-lang#115434 (make `Debug` impl for `ascii::Char` match that of `char`)
 - rust-lang#115477 (Stabilize the `Saturating` type)
 - rust-lang#115611 (add diagnostic for raw identifiers in format string)
 - rust-lang#115654 (improve PassMode docs)
 - rust-lang#115862 (Migrate `compiler/rustc_hir_typeck/src/callee.rs` to translatable diagnostics)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 584eb69 into rust-lang:master Sep 17, 2023
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@rustbot rustbot added this to the 1.74.0 milestone Sep 17, 2023
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Sep 17, 2023
Rollup merge of rust-lang#115434 - soqb:ascii-char-manual-debug, r=dtolnay

make `Debug` impl for `ascii::Char` match that of `char`

# Objective
use a more recognisable format for the `Debug` impl on `ascii::Char` than the derived one based off the enum variants. The alogorithm used is the following:
 - escape `ascii::Char::{Null, CharacterTabulation, CarraigeReturn, LineFeed, ReverseSolidus, Apostrophe}` to `'\0'`, `'\t'`, `'\r'`, `'\n'`, `'\\'` and `'\''` respectively. these are the same escape codes as `<char as Debug>::fmt` uses.
 - if `u8::is_ascii_control` is false, print the character wrapped in single quotes.
 - otherwise, print in the format `'\xAB'` where `A` and `B` are the hex nibbles of the byte. (`char` uses unicode escapes and this seems like the corresponding ascii format).

Tracking issue: rust-lang#110998
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5 participants