[INFO] fetching crate compiler_builtins 0.1.52...
[INFO] testing compiler_builtins-0.1.52 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] extracting crate compiler_builtins 0.1.52 into /workspace/builds/worker-91/source
[INFO] validating manifest of crates.io crate compiler_builtins 0.1.52 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate compiler_builtins 0.1.52
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate compiler_builtins 0.1.52
[INFO] tweaked toml for crates.io crate compiler_builtins 0.1.52 written to /workspace/builds/worker-91/source/Cargo.toml
[INFO] crate crates.io crate compiler_builtins 0.1.52 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c5a1bd6c3ee2ee7abf944562fcdec7a3c2b8311399f75293c15a11c54c7b7af0
[INFO] running `Command { std: "docker" "start" "-a" "c5a1bd6c3ee2ee7abf944562fcdec7a3c2b8311399f75293c15a11c54c7b7af0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5a1bd6c3ee2ee7abf944562fcdec7a3c2b8311399f75293c15a11c54c7b7af0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5a1bd6c3ee2ee7abf944562fcdec7a3c2b8311399f75293c15a11c54c7b7af0", kill_on_drop: false }`
[INFO] [stdout] c5a1bd6c3ee2ee7abf944562fcdec7a3c2b8311399f75293c15a11c54c7b7af0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ce090f9775f5b28d78e94ff2f686205ee97c67beb0442ef230b23713edce3b5c
[INFO] running `Command { std: "docker" "start" "-a" "ce090f9775f5b28d78e94ff2f686205ee97c67beb0442ef230b23713edce3b5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling compiler_builtins v0.1.52 (/opt/rustwide/workdir)
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]  --> src/float/pow.rs:8:19
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut pow = i32::abs_diff(b, 0);
[INFO] [stdout]   |                   ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]   = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]   = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]   = help: call with fully qualified syntax `Int::abs_diff(...)` to keep using the current method
[INFO] [stdout]   = help: add `#![feature(int_abs_diff)]` to the crate attributes to enable `num::<impl i32>::abs_diff`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `Command { std: "docker" "inspect" "ce090f9775f5b28d78e94ff2f686205ee97c67beb0442ef230b23713edce3b5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce090f9775f5b28d78e94ff2f686205ee97c67beb0442ef230b23713edce3b5c", kill_on_drop: false }`
[INFO] [stdout] ce090f9775f5b28d78e94ff2f686205ee97c67beb0442ef230b23713edce3b5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c79ee06fdcb2918c3e87f37647c7f34347af2b833bf76841cf94f86846e84acf
[INFO] running `Command { std: "docker" "start" "-a" "c79ee06fdcb2918c3e87f37647c7f34347af2b833bf76841cf94f86846e84acf", kill_on_drop: false }`
[INFO] [stderr]    Compiling compiler_builtins v0.1.52 (/opt/rustwide/workdir)
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]  --> src/float/pow.rs:8:19
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut pow = i32::abs_diff(b, 0);
[INFO] [stdout]   |                   ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]   = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]   = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]   = help: call with fully qualified syntax `Int::abs_diff(...)` to keep using the current method
[INFO] [stdout]   = help: add `#![feature(int_abs_diff)]` to the crate attributes to enable `num::<impl i32>::abs_diff`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `panic_handler`
[INFO] [stdout]   --> examples/intrinsics.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | extern crate panic_handler;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `compiler_builtins` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c79ee06fdcb2918c3e87f37647c7f34347af2b833bf76841cf94f86846e84acf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c79ee06fdcb2918c3e87f37647c7f34347af2b833bf76841cf94f86846e84acf", kill_on_drop: false }`
[INFO] [stdout] c79ee06fdcb2918c3e87f37647c7f34347af2b833bf76841cf94f86846e84acf