[INFO] fetching crate tweakster 0.0.3...
[INFO] testing tweakster-0.0.3 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate tweakster 0.0.3 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate tweakster 0.0.3
[INFO] finished tweaking crates.io crate tweakster 0.0.3
[INFO] tweaked toml for crates.io crate tweakster 0.0.3 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tweakster 0.0.3 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate tweakster 0.0.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3c4aef568cb0c0d83eaa57248fe54b6ad75865975fbed31da1d0c72aadedc0d5
[INFO] running `Command { std: "docker" "start" "-a" "3c4aef568cb0c0d83eaa57248fe54b6ad75865975fbed31da1d0c72aadedc0d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c4aef568cb0c0d83eaa57248fe54b6ad75865975fbed31da1d0c72aadedc0d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c4aef568cb0c0d83eaa57248fe54b6ad75865975fbed31da1d0c72aadedc0d5", kill_on_drop: false }`
[INFO] [stdout] 3c4aef568cb0c0d83eaa57248fe54b6ad75865975fbed31da1d0c72aadedc0d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1198bb9d3f00a8253613941248e67091878dc96de1cb0a15ad5fffa34bfd28f6
[INFO] running `Command { std: "docker" "start" "-a" "1198bb9d3f00a8253613941248e67091878dc96de1cb0a15ad5fffa34bfd28f6", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]    Compiling libc v0.2.123
[INFO] [stderr]    Compiling regex-syntax v0.6.27
[INFO] [stderr]    Compiling bindgen v0.59.2
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling shlex v1.1.0
[INFO] [stderr]    Compiling libloading v0.7.3
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling once_cell v1.13.0
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]    Compiling tracing-attributes v0.1.22
[INFO] [stderr]    Compiling scroll_derive v0.10.5
[INFO] [stderr]    Compiling errno v0.2.8
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling tracing-core v0.1.28
[INFO] [stderr]    Compiling merge_derive v0.1.0
[INFO] [stderr]    Compiling smart-default v0.6.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling clang-sys v1.3.3
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling scroll v0.10.2
[INFO] [stderr]    Compiling merge v0.1.0
[INFO] [stderr]    Compiling goblin v0.2.3
[INFO] [stderr]    Compiling nom v7.1.1
[INFO] [stderr]    Compiling tracing v0.1.35
[INFO] [stderr]    Compiling thiserror v1.0.31
[INFO] [stderr]    Compiling regex v1.6.0
[INFO] [stderr]    Compiling cexpr v0.6.0
[INFO] [stderr]    Compiling structopt v0.3.26
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling loopdev v0.4.0
[INFO] [stderr] error: failed to run custom build command for `loopdev v0.4.0`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/loopdev-cb8d623f68cb2d87/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' (856) panicked at /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.37/src/fallback.rs:701:9:
[INFO] [stderr]   "enum_(unnamed_at_/usr/include/linux/loop_h_16_1)" is not a valid Ident
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x5bf19e5e85da - std[128c3efe2914e152]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr]      1:     0x5bf19e5e85da - std[128c3efe2914e152]::backtrace_rs::backtrace::trace_unsynchronized::<std[128c3efe2914e152]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stderr]      2:     0x5bf19e5e85da - std[128c3efe2914e152]::sys::backtrace::_print_fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:74:9
[INFO] [stderr]      3:     0x5bf19e5e85da - <<std[128c3efe2914e152]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[6771d259883166e6]::fmt::Display>::fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:44:26
[INFO] [stderr]      4:     0x5bf19e5fdbca - <core[6771d259883166e6]::fmt::rt::Argument>::fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/fmt/rt.rs:152:76
[INFO] [stderr]      5:     0x5bf19e5fdbca - core[6771d259883166e6]::fmt::write
[INFO] [stderr]      6:     0x5bf19e5ed552 - std[128c3efe2914e152]::io::default_write_fmt::<std[128c3efe2914e152]::sys::stdio::unix::Stderr>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/io/mod.rs:621:11
[INFO] [stderr]      7:     0x5bf19e5ed552 - <std[128c3efe2914e152]::sys::stdio::unix::Stderr as std[128c3efe2914e152]::io::Write>::write_fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/io/mod.rs:1976:13
[INFO] [stderr]      8:     0x5bf19e5cbaff - <std[128c3efe2914e152]::sys::backtrace::BacktraceLock>::print
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:47:9
[INFO] [stderr]      9:     0x5bf19e5cbaff - std[128c3efe2914e152]::panicking::default_hook::{closure#0}
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:292:27
[INFO] [stderr]     10:     0x5bf19e5e3001 - std[128c3efe2914e152]::panicking::default_hook
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:319:9
[INFO] [stderr]     11:     0x5bf19e5e327b - std[128c3efe2914e152]::panicking::panic_with_hook
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:825:13
[INFO] [stderr]     12:     0x5bf19e5cbbb8 - std[128c3efe2914e152]::panicking::panic_handler::{closure#0}
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:698:13
[INFO] [stderr]     13:     0x5bf19e5c0d09 - std[128c3efe2914e152]::sys::backtrace::__rust_end_short_backtrace::<std[128c3efe2914e152]::panicking::panic_handler::{closure#0}, !>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/sys/backtrace.rs:182:18
[INFO] [stderr]     14:     0x5bf19e5cc51d - __rustc[752cc74e29381ccc]::rust_begin_unwind
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:689:5
[INFO] [stderr]     15:     0x5bf19e5fe40c - core[6771d259883166e6]::panicking::panic_fmt
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/panicking.rs:80:14
[INFO] [stderr]     16:     0x5bf19e5916db - proc_macro2::fallback::validate_ident::hc16fece7597c0ef7
[INFO] [stderr]     17:     0x5bf19e591901 - proc_macro2::fallback::Ident::_new::h513d0753a456404f
[INFO] [stderr]     18:     0x5bf19e5918bf - proc_macro2::fallback::Ident::new::he4a4eedaeca20cfe
[INFO] [stderr]     19:     0x5bf19e59e998 - proc_macro2::imp::Ident::new::he71dd7796d85b9bb
[INFO] [stderr]     20:     0x5bf19e5970f8 - proc_macro2::Ident::new::h69f5e18a618f36b1
[INFO] [stderr]     21:     0x5bf19e344e4f - bindgen::ir::context::BindgenContext::rust_ident_raw::hd690c276f46a8826
[INFO] [stderr]     22:     0x5bf19e342bb0 - bindgen::ir::context::BindgenContext::rust_ident::h94b66f2b0aa3094e
[INFO] [stderr]     23:     0x5bf19e3ca3d6 - <bindgen::ir::enum_ty::Enum as bindgen::codegen::CodeGenerator>::codegen::h740534a5f8d65c8d
[INFO] [stderr]     24:     0x5bf19e3c705e - <bindgen::ir::ty::Type as bindgen::codegen::CodeGenerator>::codegen::haf0a66740699bbfe
[INFO] [stderr]     25:     0x5bf19e3a8ff8 - <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen::hd54e3c479bbc7808
[INFO] [stderr]     26:     0x5bf19e35e065 - <bindgen::ir::module::Module as bindgen::codegen::CodeGenerator>::codegen::{{closure}}::hd8168cf5336bc78a
[INFO] [stderr]     27:     0x5bf19e3a0e97 - <bindgen::ir::module::Module as bindgen::codegen::CodeGenerator>::codegen::h39febc59a29182cb
[INFO] [stderr]     28:     0x5bf19e3a8fdd - <bindgen::ir::item::Item as bindgen::codegen::CodeGenerator>::codegen::hd54e3c479bbc7808
[INFO] [stderr]     29:     0x5bf19e36bdcc - bindgen::codegen::codegen::{{closure}}::h48329c2b3ec6a386
[INFO] [stderr]     30:     0x5bf19e34f548 - bindgen::ir::context::BindgenContext::gen::h93a98cf3282a774e
[INFO] [stderr]     31:     0x5bf19e36b6ff - bindgen::codegen::codegen::hc9792efabe3fc731
[INFO] [stderr]     32:     0x5bf19e329df9 - bindgen::Bindings::generate::h8465b8e084530eb1
[INFO] [stderr]     33:     0x5bf19e326d5f - bindgen::Builder::generate::h8b15388379237f29
[INFO] [stderr]     34:     0x5bf19e2cc976 - build_script_build::main::he3760e6fdec7eae2
[INFO] [stderr]     35:     0x5bf19e2cd403 - core::ops::function::FnOnce::call_once::h6f58ce5366ef7f61
[INFO] [stderr]     36:     0x5bf19e2cd1b6 - std::sys::backtrace::__rust_begin_short_backtrace::h6b89ba8b28c4494c
[INFO] [stderr]     37:     0x5bf19e2cd199 - std::rt::lang_start::{{closure}}::hf95cc56d7e973d84
[INFO] [stderr]     38:     0x5bf19e5e2154 - <&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe as core[6771d259883166e6]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/ops/function.rs:287:21
[INFO] [stderr]     39:     0x5bf19e5e2154 - std[128c3efe2914e152]::panicking::catch_unwind::do_call::<&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe, i32>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:581:40
[INFO] [stderr]     40:     0x5bf19e5e2154 - std[128c3efe2914e152]::panicking::catch_unwind::<i32, &dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:544:19
[INFO] [stderr]     41:     0x5bf19e5e2154 - std[128c3efe2914e152]::panic::catch_unwind::<&dyn core[6771d259883166e6]::ops::function::Fn<(), Output = i32> + core[6771d259883166e6]::marker::Sync + core[6771d259883166e6]::panic::unwind_safe::RefUnwindSafe, i32>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panic.rs:359:14
[INFO] [stderr]     42:     0x5bf19e5e2154 - std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/rt.rs:175:24
[INFO] [stderr]     43:     0x5bf19e5e2154 - std[128c3efe2914e152]::panicking::catch_unwind::do_call::<std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:581:40
[INFO] [stderr]     44:     0x5bf19e5e2154 - std[128c3efe2914e152]::panicking::catch_unwind::<isize, std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panicking.rs:544:19
[INFO] [stderr]     45:     0x5bf19e5e2154 - std[128c3efe2914e152]::panic::catch_unwind::<std[128c3efe2914e152]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/panic.rs:359:14
[INFO] [stderr]     46:     0x5bf19e5e2154 - std[128c3efe2914e152]::rt::lang_start_internal
[INFO] [stderr]                                  at /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/std/src/rt.rs:171:5
[INFO] [stderr]     47:     0x5bf19e2cd181 - std::rt::lang_start::h369572c57fd1777b
[INFO] [stderr]     48:     0x5bf19e2ce1a5 - main
[INFO] [stderr]     49:     0x7cdcd98981ca - <unknown>
[INFO] [stderr]     50:     0x7cdcd989828b - __libc_start_main
[INFO] [stderr]     51:     0x5bf19e2cc805 - _start
[INFO] [stderr]     52:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "1198bb9d3f00a8253613941248e67091878dc96de1cb0a15ad5fffa34bfd28f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1198bb9d3f00a8253613941248e67091878dc96de1cb0a15ad5fffa34bfd28f6", kill_on_drop: false }`
[INFO] [stdout] 1198bb9d3f00a8253613941248e67091878dc96de1cb0a15ad5fffa34bfd28f6
