[INFO] fetching crate tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1...
[INFO] testing tg-rcore-tutorial-games-ch4-tetris-user-0.1.0-preview.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1
[INFO] finished tweaking crates.io crate tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1
[INFO] tweaked toml for crates.io crate tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1 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 tg-rcore-tutorial-games-ch4-tetris-user 0.1.0-preview.1 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 3a75f1d3f782d3f48ecc41de6d25c90124750b271a142704b1c3037f3b94fcf4
[INFO] running `Command { std: "docker" "start" "-a" "3a75f1d3f782d3f48ecc41de6d25c90124750b271a142704b1c3037f3b94fcf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3a75f1d3f782d3f48ecc41de6d25c90124750b271a142704b1c3037f3b94fcf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a75f1d3f782d3f48ecc41de6d25c90124750b271a142704b1c3037f3b94fcf4", kill_on_drop: false }`
[INFO] [stdout] 3a75f1d3f782d3f48ecc41de6d25c90124750b271a142704b1c3037f3b94fcf4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 8e10096193e3d64354ad225830ae7000f385ad64be1fbc2a43ce756067f583f2
[INFO] running `Command { std: "docker" "start" "-a" "8e10096193e3d64354ad225830ae7000f385ad64be1fbc2a43ce756067f583f2", kill_on_drop: false }`
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling tg-rcore-tutorial-games-syscall v0.1.0-preview.1
[INFO] [stderr]    Compiling numeric-enum-macro v0.2.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling tg-rcore-tutorial-games-ch4-tetris-user v0.1.0-preview.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling log v0.4.29
[INFO] [stderr]    Compiling customizable-buddy v0.0.2
[INFO] [stderr]    Compiling tg-rcore-tutorial-signal-defs v0.4.8
[INFO] [stderr]    Compiling lock_api v0.4.14
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling tg-rcore-tutorial-console v0.4.8
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/opt/rustwide/target/debug/deps/rustcpLRgEN/symbols.o" "<2 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/{libgames_lib-823c1e7fea5c6681,libtg_rcore_tutorial_games_syscall-8605fafc5d535043,libtg_rcore_tutorial_signal_defs-2a682dbfe058713e,libnumeric_enum_macro-b8e6154a36bb70a0,libbitflags-196d265a374bc252,libtg_rcore_tutorial_console-06074361e9ce1caa,libspin-1985f514bef1f021,liblock_api-1f7acb22135b36e0,libscopeguard-fada665898fbe050,liblog-bed0e434ba27c31f,libcustomizable_buddy-a0bfe9a55870cc63}.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-L" "/opt/rustwide/target/debug/deps/rustcpLRgEN/raw-dylibs" "-Wl,-Bdynamic" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/ch4_tangram-892fcaa1d7da96de" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: some arguments are omitted. use `--verbose` to show all linker arguments
[INFO] [stdout]   = note: rust-lld: error: duplicate symbol: _start
[INFO] [stdout]           >>> defined at /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/Scrt1.o:(_start)
[INFO] [stdout]           >>> defined at lib.rs:19 (src/lib.rs:19)
[INFO] [stdout]           >>>            games_lib-823c1e7fea5c6681.games_lib.5ac48580a90d3fb2-cgu.0.rcgu.o:(.text.entry+0x0) in archive /opt/rustwide/target/debug/deps/libgames_lib-823c1e7fea5c6681.rlib
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tg-rcore-tutorial-games-ch4-tetris-user` (bin "ch4-tangram") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/opt/rustwide/target/debug/deps/rustc94do1i/symbols.o" "<2 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/{libgames_lib-823c1e7fea5c6681,libtg_rcore_tutorial_games_syscall-8605fafc5d535043,libtg_rcore_tutorial_signal_defs-2a682dbfe058713e,libnumeric_enum_macro-b8e6154a36bb70a0,libbitflags-196d265a374bc252,libtg_rcore_tutorial_console-06074361e9ce1caa,libspin-1985f514bef1f021,liblock_api-1f7acb22135b36e0,libscopeguard-fada665898fbe050,liblog-bed0e434ba27c31f,libcustomizable_buddy-a0bfe9a55870cc63}.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-L" "/opt/rustwide/target/debug/deps/rustc94do1i/raw-dylibs" "-Wl,-Bdynamic" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/ch4_tetris-94d2e884c1cf5ada" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: some arguments are omitted. use `--verbose` to show all linker arguments
[INFO] [stdout]   = note: rust-lld: error: duplicate symbol: _start
[INFO] [stdout]           >>> defined at /usr/lib/gcc/x86_64-linux-gnu/13/../../../x86_64-linux-gnu/Scrt1.o:(_start)
[INFO] [stdout]           >>> defined at lib.rs:19 (src/lib.rs:19)
[INFO] [stdout]           >>>            games_lib-823c1e7fea5c6681.games_lib.5ac48580a90d3fb2-cgu.0.rcgu.o:(.text.entry+0x0) in archive /opt/rustwide/target/debug/deps/libgames_lib-823c1e7fea5c6681.rlib
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tg-rcore-tutorial-games-ch4-tetris-user` (bin "ch4-tetris") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "8e10096193e3d64354ad225830ae7000f385ad64be1fbc2a43ce756067f583f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e10096193e3d64354ad225830ae7000f385ad64be1fbc2a43ce756067f583f2", kill_on_drop: false }`
[INFO] [stdout] 8e10096193e3d64354ad225830ae7000f385ad64be1fbc2a43ce756067f583f2
