[INFO] cloning repository https://github.com/FUTingFei/programming_bitcoin_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/FUTingFei/programming_bitcoin_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFUTingFei%2Fprogramming_bitcoin_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFUTingFei%2Fprogramming_bitcoin_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bc82c9124a853f5ecc698d700dffc4a5be02a1e1
[INFO] checking FUTingFei/programming_bitcoin_rust against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFUTingFei%2Fprogramming_bitcoin_rust" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/FUTingFei/programming_bitcoin_rust on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/FUTingFei/programming_bitcoin_rust
[INFO] finished tweaking git repo https://github.com/FUTingFei/programming_bitcoin_rust
[INFO] tweaked toml for git repo https://github.com/FUTingFei/programming_bitcoin_rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/FUTingFei/programming_bitcoin_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b7064200bd3eac914269c104289a4c0a46c68708d642e510f5d1c71961e2a874
[INFO] running `Command { std: "docker" "start" "-a" "b7064200bd3eac914269c104289a4c0a46c68708d642e510f5d1c71961e2a874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7064200bd3eac914269c104289a4c0a46c68708d642e510f5d1c71961e2a874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7064200bd3eac914269c104289a4c0a46c68708d642e510f5d1c71961e2a874", kill_on_drop: false }`
[INFO] [stdout] b7064200bd3eac914269c104289a4c0a46c68708d642e510f5d1c71961e2a874
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2836fc14bb633fa2f4d97646119bb8c6bc6e605a4e974ab3151f7c73de2a8ecf
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2836fc14bb633fa2f4d97646119bb8c6bc6e605a4e974ab3151f7c73de2a8ecf", kill_on_drop: false }`
[INFO] [stderr]     Checking programming_bitcoin_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::chapter03_2`
[INFO] [stdout]  --> src/chapter03_4.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::chapter03_2;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::chapter03_2`
[INFO] [stdout]  --> src/chapter03_4.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::chapter03_2;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `core::num::<impl u64>::pow` is not yet stable as a const fn
[INFO] [stdout]  --> src/chapter03_4.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | const P:u64 = 2u64.pow(256)- 2u64.pow(32) - 977;
[INFO] [stdout]   |               ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: add `#![feature(const_int_pow)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `core::num::<impl u64>::pow` is not yet stable as a const fn
[INFO] [stdout]  --> src/chapter03_4.rs:4:30
[INFO] [stdout]   |
[INFO] [stdout] 4 | const P:u64 = 2u64.pow(256)- 2u64.pow(32) - 977;
[INFO] [stdout]   |                              ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: add `#![feature(const_int_pow)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `programming_bitcoin_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: `core::num::<impl u64>::pow` is not yet stable as a const fn
[INFO] [stdout]  --> src/chapter03_4.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | const P:u64 = 2u64.pow(256)- 2u64.pow(32) - 977;
[INFO] [stdout]   |               ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: add `#![feature(const_int_pow)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `core::num::<impl u64>::pow` is not yet stable as a const fn
[INFO] [stdout]  --> src/chapter03_4.rs:4:30
[INFO] [stdout]   |
[INFO] [stdout] 4 | const P:u64 = 2u64.pow(256)- 2u64.pow(32) - 977;
[INFO] [stdout]   |                              ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: add `#![feature(const_int_pow)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2836fc14bb633fa2f4d97646119bb8c6bc6e605a4e974ab3151f7c73de2a8ecf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2836fc14bb633fa2f4d97646119bb8c6bc6e605a4e974ab3151f7c73de2a8ecf", kill_on_drop: false }`
[INFO] [stdout] 2836fc14bb633fa2f4d97646119bb8c6bc6e605a4e974ab3151f7c73de2a8ecf