[INFO] cloning repository https://github.com/lights0123/n-flashcards
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lights0123/n-flashcards" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flights0123%2Fn-flashcards"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flights0123%2Fn-flashcards'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 02f89be2aaad202bdb4641ae47b2d9bb75b19748
[INFO] checking lights0123/n-flashcards against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flights0123%2Fn-flashcards" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lights0123/n-flashcards on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/lights0123/n-flashcards
[INFO] finished tweaking git repo https://github.com/lights0123/n-flashcards
[INFO] tweaked toml for git repo https://github.com/lights0123/n-flashcards written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/lights0123/n-flashcards already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f52383bd628cd07d5a16c8e31f219464e491948d7b0f091c66139b178df5c361
[INFO] running `"docker" "start" "-a" "f52383bd628cd07d5a16c8e31f219464e491948d7b0f091c66139b178df5c361"`
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking cty v0.1.5
[INFO] [stderr]     Checking cty v0.2.0
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling ndless-static-vars v1.0.0
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr] error[E0412]: cannot find type `Vec` in this scope
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:34
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stderr]   |                                  ^^^ not found in this scope
[INFO] [stderr]   |
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::prelude::v1::Vec;
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::vec::Vec;
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `String` in this scope
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:38
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stderr]   |                                      ^^^^^^ not found in this scope
[INFO] [stderr]   |
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::prelude::v1::String;
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::string::String;
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr]    Compiling ndless-static-vars v2.0.1
[INFO] [stderr] error[E0658]: use of unstable library feature 'alloc_prelude'
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: see issue #58935 <https://github.com/rust-lang/rust/issues/58935> for more information
[INFO] [stderr]   = help: add `#![feature(alloc_prelude)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0412, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0412`.
[INFO] [stderr] error: could not compile `ndless-static-vars`.
[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] [stderr] error[E0412]: cannot find type `Vec` in this scope
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:34
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stderr]   |                                  ^^^ not found in this scope
[INFO] [stderr]   |
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::prelude::v1::Vec;
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::vec::Vec;
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `String` in this scope
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:38
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stderr]   |                                      ^^^^^^ not found in this scope
[INFO] [stderr]   |
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::prelude::v1::String;
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::string::String;
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'alloc_prelude'
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use alloc::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: see issue #58935 <https://github.com/rust-lang/rust/issues/58935> for more information
[INFO] [stderr]   = help: add `#![feature(alloc_prelude)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0412, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0412`.
[INFO] [stderr] error: could not compile `ndless-static-vars`.
[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] [stderr] error: build failed
[INFO] running `"docker" "inspect" "f52383bd628cd07d5a16c8e31f219464e491948d7b0f091c66139b178df5c361"`
[INFO] running `"docker" "rm" "-f" "f52383bd628cd07d5a16c8e31f219464e491948d7b0f091c66139b178df5c361"`
[INFO] [stdout] f52383bd628cd07d5a16c8e31f219464e491948d7b0f091c66139b178df5c361