Cannot tell apart panic!() and assert!(false, "") in macro_backtrace()

[Aurel300]

The two expressions:

panic!(); // A
assert!(false, "msg"); // B

Used to result in distinct macro_backtrace(). After updating to nightly-2021-02-14 (and I guess since #80851), the backtrace for both is identical, both listing the calls ["std::panic::panic_2015", "std::panic"].

IIUC, the latter should contain an additional core::assert or std::assert item in the backtrace.

Meta

rustc --version --verbose:

rustc 1.52.0-nightly (5fa22fe6f 2021-02-14)
binary: rustc
commit-hash: 5fa22fe6f821ac3801d05f624b123dda25fde32c
commit-date: 2021-02-14
host: x86_64-unknown-linux-gnu
release: 1.52.0-nightly
LLVM version: 11.0.1

[jyn514]

@Aurel300 what do you mean by macro_backtrace? I can't find it in the docs for the standard library.

[jyn514]

Do you mean https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/span_encoding/struct.Span.html#method.macro_backtrace?

[Aurel300]

@jyn514 Yep, sorry, I should have linked to it. Yes, it is the Span::macro_backtrace you linked.

[jyn514]

cc @m-ou-se