[EXPERIMENT] Outline some panics with constant messages

[hanna-kruppe]

Inspired by #163657

[hanna-kruppe]

@bors try @rust-timer queue

[rust-log-analyzer]

The job test-aarch64-gnu-llvm-22-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

---- [ui] tests/ui/proc-macro/quote/debug.rs stdout ----
Saved the actual stdout to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/proc-macro/quote/debug/debug.stdout`
diff of stdout:

34                                 (iter.next(), iter.next()) {
35                             lit.set_span(crate::Span::recover_proc_macro_span(2));
36                             lit
-                         } else {
-                             ::core::panicking::panic("internal error: entered unreachable code")
-                         }
+                         } else { ::core::panic::unreachable_noargs() }
40                     }), &mut ts);
41         crate::ToTokens::to_tokens(&crate::TokenTree::Punct(crate::Punct::new(';',
42                         crate::Spacing::Alone)), &mut ts);

53                                 (iter.next(), iter.next()) {
54                             lit.set_span(crate::Span::recover_proc_macro_span(5));
55                             lit
-                         } else {
-                             ::core::panicking::panic("internal error: entered unreachable code")
-                         }
+                         } else { ::core::panic::unreachable_noargs() }
59                     }), &mut ts);
60         crate::ToTokens::to_tokens(&crate::TokenTree::Punct(crate::Punct::new(';',
61                         crate::Spacing::Alone)), &mut ts);


The actual stdout differed from the expected stdout
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args proc-macro/quote/debug.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/proc-macro/quote/debug.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/proc-macro/quote/debug" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2015" "-Z" "unpretty=expanded"
--- stdout -------------------------------
#![feature(prelude_import)]
#![no_std]
//@ check-pass
//@ force-host
---
extern crate proc_macro;

fn main() {
    {
        let mut ts = crate::TokenStream::new();
        crate::ToTokens::to_tokens(&crate::TokenTree::Ident(crate::Ident::new("let",
                        crate::Span::recover_proc_macro_span(0))), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Ident(crate::Ident::new("hello",
                        crate::Span::recover_proc_macro_span(1))), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Punct(crate::Punct::new('=',
                        crate::Spacing::Alone)), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Literal({
                        let mut iter =
                            "\"world\"".parse::<crate::TokenStream>().unwrap().into_iter();
                        if let (Some(crate::TokenTree::Literal(mut lit)), None) =
                                (iter.next(), iter.next()) {
                            lit.set_span(crate::Span::recover_proc_macro_span(2));
                            lit
                        } else { ::core::panic::unreachable_noargs() }
                    }), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Punct(crate::Punct::new(';',
                        crate::Spacing::Alone)), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Ident(crate::Ident::new("let",
                        crate::Span::recover_proc_macro_span(3))), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Ident(crate::Ident::new_raw("raw_ident",
                        crate::Span::recover_proc_macro_span(4))), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Punct(crate::Punct::new('=',
                        crate::Spacing::Alone)), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Literal({
                        let mut iter =
                            "r#\"raw\"literal\"#".parse::<crate::TokenStream>().unwrap().into_iter();
                        if let (Some(crate::TokenTree::Literal(mut lit)), None) =
                                (iter.next(), iter.next()) {
                            lit.set_span(crate::Span::recover_proc_macro_span(5));
                            lit
                        } else { ::core::panic::unreachable_noargs() }
                    }), &mut ts);
        crate::ToTokens::to_tokens(&crate::TokenTree::Punct(crate::Punct::new(';',
                        crate::Spacing::Alone)), &mut ts);
        ts
    }
}
const _: () =
    {
        extern crate proc_macro;
        #[rustc_proc_macro_decls]
        #[used]
        #[allow(deprecated)]
        static _DECLS: &[proc_macro::bridge::client::Client] = &[];
    };
------------------------------------------
stderr: none

---- [ui] tests/ui/proc-macro/quote/debug.rs stdout end ----

[rust-bors]

☀️ Try build successful (CI)
Build commit: caa37fb (caa37fb206c657fa2ce3b0adc2fe67084eaee0a8)
Base parent: f48b3e6 (f48b3e61eeece268609bd920fcca1ded047db7ca)

[rust-timer]

Finished benchmarking commit (caa37fb): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.1%	[0.1%, 0.1%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.1%	[-0.1%, -0.1%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.0%	[-0.1%, 0.1%]	2

Max RSS (memory usage)

Results (secondary 1.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	4.1%	[2.1%, 6.1%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.1%	[-4.1%, -4.1%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 0.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	6.7%	[6.7%, 6.7%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.1%	[-2.4%, -1.9%]	2
All ❌✅ (primary)	-	-	0

Binary size

Results (primary -0.2%, secondary -0.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.2%	[-0.3%, -0.2%]	11
Improvements ✅ (secondary)	-0.4%	[-0.6%, -0.2%]	13
All ❌✅ (primary)	-0.2%	[-0.3%, -0.2%]	11

Bootstrap: 490.122s -> 490.205s (0.02%)
Artifact size: 408.65 MiB -> 408.94 MiB (0.07%)