Debug print char 0 as '\0' rather than '\u{0}' #95345

dtolnay · 2022-03-26T21:14:33Z

println!("{:?}", "foo\0");

Before: "foo\u{0}"
After: "foo\0"

println!("{:?}", '\0');

Before: '\u{0}'
After: '\0'

'\0' will be more recognizable to everyone than '\u{0}' because it's how we talk about character 0 in all of our docs and example code, such as https://doc.rust-lang.org/std/ffi/index.html, https://doc.rust-lang.org/std/ffi/struct.CStr.html, https://doc.rust-lang.org/std/ffi/struct.CString.html.

rust-highfive · 2022-03-26T21:14:36Z

r? @kennytm

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Dylan-DPC · 2022-03-26T23:04:37Z

@bors r+

bors · 2022-03-26T23:04:39Z

📌 Commit 72ee247 has been approved by Dylan-DPC

Debug print char 0 as '\0' rather than '\u{0}' ```rust println!("{:?}", "foo\0"); ``` - **Before:** `"foo\u{0}"` - **After:** `"foo\0"` ```rust println!("{:?}", '\0'); ``` - **Before:** `'\u{0}'` - **After:** `'\0'` `'\0'` will be more recognizable to everyone than `'\u{0}'` because it's how we talk about character 0 in all of our docs and example code, such as https://doc.rust-lang.org/std/ffi/index.html, https://doc.rust-lang.org/std/ffi/struct.CStr.html, https://doc.rust-lang.org/std/ffi/struct.CString.html.

Dylan-DPC · 2022-03-27T03:22:11Z

failed in rollup

@bors r-

dtolnay · 2022-03-27T05:02:53Z

That looks like ripgrep's test suite (which cargotest runs). As of BurntSushi/ripgrep#1722 ripgrep's test suite is no longer sensitive to this PR. I put up #95355 to import a newer version of ripgrep's test suite into cargotest.

Bump the ripgrep commit exercised by cargotest This update goes from BurntSushi/ripgrep@3de31f7 (Aug 1, 2019) to current master, BurntSushi/ripgrep@ced5b92 (March 21, 2022). I need this in order to pick up BurntSushi/ripgrep#1722, which picked up BurntSushi/bstr#58, which unblocks rust-lang#95345. Ripgrep uses the Debug representation of a `BStr` in some of its tests. In old versions of bstr, that used to just use the standard library's `escape_debug()` implementation, so the output ends up being sensitive to whether the standard library renders character 0 as `\u{0}` or as `\0`. The newer bstr always renders character 0 as `\0` and ripgrep's test suite has been correspondingly updated.

dtolnay · 2022-03-27T11:50:19Z

Rebased on Bump the ripgrep commit exercised by cargotest #95355

@bors r=Dylan-DPC

bors · 2022-03-27T11:50:21Z

📌 Commit 2ac9efb has been approved by Dylan-DPC

bors · 2022-03-27T11:50:28Z

⌛ Testing commit 2ac9efb with merge b03c0e5730b82e0d5e171695973b527dc5a8beca...

bors · 2022-03-27T12:25:55Z

💔 Test failed - checks-actions

rust-log-analyzer · 2022-03-27T12:29:48Z

The job x86_64-gnu-tools failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

To only update this specific test, also pass `--test-args concurrency/libc_pthread_cond.rs`

error: 1 errors occurred comparing output.
status: exit status: 101
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/miri" "tests/run-pass/concurrency/libc_pthread_cond.rs" "-L" "/tmp/compiletestjW70wG" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-C" "prefer-dynamic" "-o" "/tmp/compiletestjW70wG/concurrency/libc_pthread_cond.stage-id" "-A" "unused" "--edition" "2018" "-Astable-features" "--sysroot" "/home/user/.cache/miri/HOST" "-Zmiri-disable-isolation" "-Zmiri-check-number-validity" "-L" "/tmp/compiletestjW70wG/concurrency/libc_pthread_cond.stage-id.aux"
------------------------------------------

------------------------------------------
stderr:
---
To only update this specific test, also pass `--test-args concurrency/sync.rs`

error: 2 errors occurred comparing output.
status: exit status: 101
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/miri" "tests/run-pass/concurrency/sync.rs" "-L" "/tmp/compiletestjW70wG" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-C" "prefer-dynamic" "-o" "/tmp/compiletestjW70wG/concurrency/sync.stage-id" "-A" "unused" "--edition" "2018" "-Astable-features" "--sysroot" "/home/user/.cache/miri/HOST" "-Zmiri-disable-isolation" "-Zmiri-check-number-validity" "-L" "/tmp/compiletestjW70wG/concurrency/sync.stage-id.aux"
------------------------------------------

------------------------------------------
stderr:
---
To only update this specific test, also pass `--test-args vec.rs`

error: 1 errors occurred comparing output.
status: exit status: 101
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/miri" "tests/run-pass/vec.rs" "-L" "/tmp/compiletestjW70wG" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-C" "prefer-dynamic" "-o" "/tmp/compiletestjW70wG/vec.stage-id" "-A" "unused" "--edition" "2018" "-Astable-features" "--sysroot" "/home/user/.cache/miri/HOST" "-Zmiri-tag-raw-pointers" "-Zmiri-check-number-validity" "-L" "/tmp/compiletestjW70wG/vec.stage-id.aux"
------------------------------------------

------------------------------------------
stderr:
---
.......... (60/61)
          (61/61)


/checkout/src/test/rustdoc-gui/escape-key.goml escape-key... FAILED
[ERROR] (line 6) TimeoutError: waiting for selector "#search h1" failed: timeout 30000ms exceeded: for command `wait-for: "#search h1" // The search element is empty before the first search `
Build completed unsuccessfully in 0:00:43

dtolnay · 2022-03-27T16:34:33Z

@bors retry

bors · 2022-03-27T16:36:12Z

⌛ Testing commit 2ac9efb with merge d7aca22...

bors · 2022-03-27T18:55:53Z

☀️ Test successful - checks-actions
Approved by: Dylan-DPC
Pushing d7aca22 to master...

rust-timer · 2022-03-28T06:26:51Z

Finished benchmarking commit (d7aca22): comparison url.

Summary: This benchmark run did not return any relevant results. 6 results were found to be statistically significant but too small to be relevant.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

This follows this PR in rustc: <rust-lang/rust#95345> Which breakage was discussed here: <rust-lang/rust#95732> Because this landed in 1.61.0, the MSRV has to be updated accordingly.

This follows this PR in rustc: <rust-lang/rust#95345> Which breakage was discussed here: <rust-lang/rust#95732> Still relying on \0 would require bumping the MSRV to 1.61.0

To 1.72 rustup update stable rustc --version # rustc 1.72.0 (5680fa18f 2023-08-23) cargo fix --allow-dirty # tells me to set resolver vim Cargo.toml # set the resolver cargo build cargo test # see snapshot failure UPDATE_SNAPSHOTS=1 cargo test # update snapshot cargo test # confirm snapshot failure is gone Context for the resolver warning: warning: some crates are on edition 2021 which defaults to `resolver = "2"`, but virtual workspaces default to `resolver = "1"` note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest Context for the snapshot failure: ... I sure wish I could find the changelog entry or an issue or a commit explaining why `std::fmt` (via `format!("{:#?}", ...)`) started outputting "\0" as "\0" instead of "\u{0}", but I can't find it... - https://releases.rs/ - https://doc.rust-lang.org/std/fmt/ - https://github.com/search?q=repo%3Arust-lang%2Frust+str%3A%3Afmt&type=issues ... no wait for it, wait for it! Here it is: - rust-lang/rust@2ac9efb - https://github.com/rust-lang/rust/releases/tag/1.61.0 (first appeared in this version, but not mentioned in changelog) - rust-lang/rust#95345

rust-highfive assigned kennytm Mar 26, 2022

rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Mar 26, 2022

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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 26, 2022

Dylan-DPC mentioned this pull request Mar 26, 2022

Rollup of 5 pull requests #95347

Closed

Dylan-DPC mentioned this pull request Mar 26, 2022

Rollup of 4 pull requests #95349

Closed

bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Mar 27, 2022

dtolnay mentioned this pull request Mar 27, 2022

Bump the ripgrep commit exercised by cargotest #95355

Merged

dtolnay added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 27, 2022

Debug print char 0 as '\0' rather than '\u{0}'

2ac9efb

dtolnay force-pushed the escape0 branch from 72ee247 to 2ac9efb Compare March 27, 2022 11:49

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-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Mar 27, 2022

bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Mar 27, 2022

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 27, 2022

bors added the merged-by-bors This PR was explicitly merged by bors. label Mar 27, 2022

bors merged commit d7aca22 into rust-lang:master Mar 27, 2022

rustbot added this to the 1.61.0 milestone Mar 27, 2022

dtolnay deleted the escape0 branch March 27, 2022 19:05

This was referenced Mar 28, 2022

Print char 0 in error messages as '\0' rather than '\u{0}' dtolnay/semver#270

Merged

Use a character other than \0 for testing unicode escapes dtolnay/quote#216

Merged

carols10cents mentioned this pull request Apr 6, 2022

Change in behavior of debug format of strings containing \0 #95732

Closed

krtab mentioned this pull request Oct 12, 2022

Fix formatting of \0 in tests RazrFalcon/xmlparser#20

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Debug print char 0 as '\0' rather than '\u{0}' #95345

Debug print char 0 as '\0' rather than '\u{0}' #95345

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Debug print char 0 as '\0' rather than '\u{0}' #95345

Debug print char 0 as '\0' rather than '\u{0}' #95345

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