[INFO] cloning repository https://github.com/abbychau/a_core
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/abbychau/a_core" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabbychau%2Fa_core", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabbychau%2Fa_core'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cf22720717cc9dbf9abc4e681d2827619c68646e
[INFO] testing abbychau/a_core against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabbychau%2Fa_core" "/workspace/builds/worker-65/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-65/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/abbychau/a_core on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-65/source/.cargo/config
[INFO] started tweaking git repo https://github.com/abbychau/a_core
[INFO] finished tweaking git repo https://github.com/abbychau/a_core
[INFO] tweaked toml for git repo https://github.com/abbychau/a_core written to /workspace/builds/worker-65/source/Cargo.toml
[INFO] crate git repo https://github.com/abbychau/a_core already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e26f37bc117604b601389a951d03d21d4e62de57d1222299ea8d59f177364142
[INFO] running `Command { std: "docker" "start" "-a" "e26f37bc117604b601389a951d03d21d4e62de57d1222299ea8d59f177364142", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e26f37bc117604b601389a951d03d21d4e62de57d1222299ea8d59f177364142", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e26f37bc117604b601389a951d03d21d4e62de57d1222299ea8d59f177364142", kill_on_drop: false }`
[INFO] [stdout] e26f37bc117604b601389a951d03d21d4e62de57d1222299ea8d59f177364142
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1fd5b13d382cf37639f92e9ede091b52377554d3d119d4e3a59ce5b72b84a95a
[INFO] running `Command { std: "docker" "start" "-a" "1fd5b13d382cf37639f92e9ede091b52377554d3d119d4e3a59ce5b72b84a95a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling bootloader v0.9.2
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling a_core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/vga_buffer.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |         Err(e)=>{writer.write_string("ello! ");}
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-m64" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.9.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2021-08-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libvolatile-fdbbabb16e88e76d.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-08-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-beea7d9617fe25c5.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-08-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-8ef7dd43fc671f88.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-08-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-a9a3b2ad67977f47.rlib" "-Wl,-Bdynamic" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2021-08-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: /opt/rustwide/target/debug/deps/a_core-0d63cd7a2b480fd5.a_core.359cbdee-cgu.13.rcgu.o: in function `_start':
[INFO] [stdout]           /opt/rustwide/workdir/src/main.rs:13: multiple definition of `_start'; /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o:(.text+0x0): first defined here
[INFO] [stdout]           /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
[INFO] [stdout]           (.text+0x16): undefined reference to `__libc_csu_fini'
[INFO] [stdout]           /usr/bin/ld: (.text+0x1d): undefined reference to `__libc_csu_init'
[INFO] [stdout]           /usr/bin/ld: (.text+0x24): undefined reference to `main'
[INFO] [stdout]           /usr/bin/ld: (.text+0x2a): undefined reference to `__libc_start_main'
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout]   = help: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
[INFO] [stdout]   = note: use the `-l` flag to specify native libraries to link
[INFO] [stdout]   = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `a_core` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "1fd5b13d382cf37639f92e9ede091b52377554d3d119d4e3a59ce5b72b84a95a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fd5b13d382cf37639f92e9ede091b52377554d3d119d4e3a59ce5b72b84a95a", kill_on_drop: false }`
[INFO] [stdout] 1fd5b13d382cf37639f92e9ede091b52377554d3d119d4e3a59ce5b72b84a95a
