New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Try to write the panic message with a single write_all
call
#122565
Open
Zoxc
wants to merge
2
commits into
rust-lang:master
Choose a base branch
from
Zoxc:atomic-panic-msg
base: master
Could not load branches
Branch not found: {{ refName }}
Could not load tags
Nothing to show
Are you sure you want to change the base?
Some commits from the old base branch may be removed from the timeline,
and old review comments may become outdated.
+150
−19
Open
Changes from 1 commit
Commits
Show all changes
2 commits
Select commit
Hold shift + click to select a range
File filter
Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change | ||||||
---|---|---|---|---|---|---|---|---|
|
@@ -260,7 +260,21 @@ fn default_hook(info: &PanicInfo<'_>) { | |||||||
let name = thread.as_ref().and_then(|t| t.name()).unwrap_or("<unnamed>"); | ||||||||
|
||||||||
let write = |err: &mut dyn crate::io::Write| { | ||||||||
let _ = writeln!(err, "thread '{name}' panicked at {location}:\n{msg}"); | ||||||||
// Try to write the panic message to a buffer first to prevent other concurrent outputs | ||||||||
// interleaving with it. | ||||||||
let mut buffer = [0u8; 512]; | ||||||||
let mut cursor = crate::io::Cursor::new(&mut buffer[..]); | ||||||||
|
||||||||
let write_msg = |dst: &mut dyn crate::io::Write| { | ||||||||
writeln!(dst, "\nthread '{name}' panicked at {location}:\n{msg}") | ||||||||
}; | ||||||||
|
||||||||
let _ = if write_msg(&mut cursor).is_ok() { | ||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I think it'd be less confusing to move the |
||||||||
let pos = cursor.position() as usize; | ||||||||
err.write_all(&buffer[0..pos]) | ||||||||
} else { | ||||||||
write_msg(err) | ||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more.
Suggested change
|
||||||||
}; | ||||||||
|
||||||||
static FIRST_PANIC: AtomicBool = AtomicBool::new(true); | ||||||||
|
||||||||
|
1 change: 1 addition & 0 deletions
1
src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind1.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
2 changes: 2 additions & 0 deletions
2
src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.both.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
2 changes: 2 additions & 0 deletions
2
src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.definition.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
1 change: 1 addition & 0 deletions
1
src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.extern_block.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
1 change: 1 addition & 0 deletions
1
src/tools/miri/tests/fail/function_calls/return_pointer_on_unwind.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
1 change: 1 addition & 0 deletions
1
src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
1 change: 1 addition & 0 deletions
1
src/tools/miri/tests/fail/panic/tls_macro_const_drop_panic.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/div-by-zero-2.rs:LL:CC: | ||
attempt to divide by zero | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
3 changes: 3 additions & 0 deletions
3
src/tools/miri/tests/panic/function_calls/exported_symbol_good_unwind.stderr
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,7 +1,10 @@ | ||
|
||
thread 'main' panicked at $DIR/exported_symbol_good_unwind.rs:LL:CC: | ||
explicit panic | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace | ||
|
||
thread 'main' panicked at $DIR/exported_symbol_good_unwind.rs:LL:CC: | ||
explicit panic | ||
|
||
thread 'main' panicked at $DIR/exported_symbol_good_unwind.rs:LL:CC: | ||
explicit panic |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/oob_subslice.rs:LL:CC: | ||
range end index 5 out of range for slice of length 4 | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/overflowing-lsh-neg.rs:LL:CC: | ||
attempt to shift left with overflow | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/overflowing-rsh-1.rs:LL:CC: | ||
attempt to shift right with overflow | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/overflowing-rsh-2.rs:LL:CC: | ||
attempt to shift right with overflow | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/panic1.rs:LL:CC: | ||
panicking from libstd | ||
stack backtrace: | ||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/panic2.rs:LL:CC: | ||
42-panicking from libstd | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/panic3.rs:LL:CC: | ||
panicking from libcore | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/panic4.rs:LL:CC: | ||
42-panicking from libcore | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/transmute_fat2.rs:LL:CC: | ||
index out of bounds: the len is 0 but the index is 0 | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/unsupported_foreign_function.rs:LL:CC: | ||
unsupported Miri functionality: can't call foreign function `foo` on $OS | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/unsupported_syscall.rs:LL:CC: | ||
unsupported Miri functionality: can't execute syscall with ID 0 | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,6 +1,8 @@ | ||
|
||
thread 'main' panicked at $DIR/nested_panic_caught.rs:LL:CC: | ||
once | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace | ||
|
||
thread 'main' panicked at $DIR/nested_panic_caught.rs:LL:CC: | ||
twice | ||
stack backtrace: |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,5 +1,7 @@ | ||
|
||
thread '<unnamed>' panicked at $DIR/thread_panic.rs:LL:CC: | ||
Hello! | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace | ||
|
||
thread 'childthread' panicked at $DIR/thread_panic.rs:LL:CC: | ||
Hello, world! |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1 +1 @@ | ||
<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="1" tests="4" skipped="1" ><testcase classname="unknown" name="a" time="$TIME"/><testcase classname="unknown" name="b" time="$TIME"><failure type="assert"/><system-out><![CDATA[print from failing test]]>
<![CDATA[thread 'b' panicked at f.rs:10:5:]]>
<![CDATA[assertion failed: false]]>
<![CDATA[note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace]]>
<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="c" time="$TIME"/><system-out/><system-err/></testsuite></testsuites> | ||
<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="1" tests="4" skipped="1" ><testcase classname="unknown" name="a" time="$TIME"/><testcase classname="unknown" name="b" time="$TIME"><failure type="assert"/><system-out><![CDATA[print from failing test]]>

<![CDATA[thread 'b' panicked at f.rs:10:5:]]>
<![CDATA[assertion failed: false]]>
<![CDATA[note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace]]>
<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="c" time="$TIME"/><system-out/><system-err/></testsuite></testsuites> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1 +1 @@ | ||
<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="1" tests="4" skipped="1" ><testcase classname="unknown" name="a" time="$TIME"><system-out><![CDATA[print from successful test]]>
<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="b" time="$TIME"><failure type="assert"/><system-out><![CDATA[print from failing test]]>
<![CDATA[thread 'b' panicked at f.rs:10:5:]]>
<![CDATA[assertion failed: false]]>
<![CDATA[note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace]]>
<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="c" time="$TIME"><system-out><![CDATA[thread 'c' panicked at f.rs:16:5:]]>
<![CDATA[assertion failed: false]]>
<![CDATA[]]></system-out></testcase><system-out/><system-err/></testsuite></testsuites> | ||
<?xml version="1.0" encoding="UTF-8"?><testsuites><testsuite name="test" package="test" id="0" errors="0" failures="1" tests="4" skipped="1" ><testcase classname="unknown" name="a" time="$TIME"><system-out><![CDATA[print from successful test]]>
<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="b" time="$TIME"><failure type="assert"/><system-out><![CDATA[print from failing test]]>

<![CDATA[thread 'b' panicked at f.rs:10:5:]]>
<![CDATA[assertion failed: false]]>
<![CDATA[note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace]]>
<![CDATA[]]></system-out></testcase><testcase classname="unknown" name="c" time="$TIME"><system-out><![CDATA[]]>
<![CDATA[thread 'c' panicked at f.rs:16:5:]]>
<![CDATA[assertion failed: false]]>
<![CDATA[]]></system-out></testcase><system-out/><system-err/></testsuite></testsuites> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
error: the compiler unexpectedly panicked. this is a bug. | ||
|
||
query stack during panic: | ||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at library/alloc/src/raw_vec.rs:LL:CC: | ||
capacity overflow | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/const-eval-select-backtrace-std.rs:6:8: | ||
byte index 1 is out of bounds of `` | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
thread 'main' panicked at $DIR/const-eval-select-backtrace.rs:15:5: | ||
Aaah! | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,5 +1,7 @@ | ||
|
||
thread 'main' panicked at $DIR/issue-87707.rs:14:24: | ||
Here Once instance is poisoned. | ||
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace | ||
|
||
thread 'main' panicked at $DIR/issue-87707.rs:16:7: | ||
Once instance has previously been poisoned |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,4 @@ | ||
|
||
257 > 255 | ||
error: the compiler unexpectedly panicked. this is a bug. | ||
|
||
|
Oops, something went wrong.
Oops, something went wrong.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
I'd suggest to separate the functional change (more newlines) from the implementation change. Makes it easier to discuss and decide on these separately.
A leading newline is not very common in Rust output, so if it stays it definitely needs a comment explaining the purpose.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Panic output isn't stable. There's some work to add thread IDs to the panic message for example.
Yeah the extra newline is unusual, but this is an unsynchronized write to a shared output so we don't have many options to clean up the formatting in cases where a panic is emitted in the middle of something else that's printing.
proc_macro_generated_packed.stderr
is a good example of this. It start printing the panic message in the middle of reporting another error.Do you think it's disruptive enough that it warrants separate discussion?