[INFO] cloning repository https://github.com/lights0123/n-flashcards
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flights0123%2Fn-flashcards'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 02f89be2aaad202bdb4641ae47b2d9bb75b19748
[INFO] checking lights0123/n-flashcards against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flights0123%2Fn-flashcards" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lights0123/n-flashcards on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-1/source/Cargo.toml
[INFO] crate git repo https://github.com/lights0123/n-flashcards already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 339e1e8b0c490137856219fe287fd7d244a1471b9bbdd4486f21c5e37a8ebe9b
[INFO] running `Command { std: "docker" "start" "-a" "339e1e8b0c490137856219fe287fd7d244a1471b9bbdd4486f21c5e37a8ebe9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "339e1e8b0c490137856219fe287fd7d244a1471b9bbdd4486f21c5e37a8ebe9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "339e1e8b0c490137856219fe287fd7d244a1471b9bbdd4486f21c5e37a8ebe9b", kill_on_drop: false }`
[INFO] [stdout] 339e1e8b0c490137856219fe287fd7d244a1471b9bbdd4486f21c5e37a8ebe9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f765899d7cf4229afa085b2552a6d6a5082d64a4c304f856b40356a27cfa21e
[INFO] running `Command { std: "docker" "start" "-a" "8f765899d7cf4229afa085b2552a6d6a5082d64a4c304f856b40356a27cfa21e", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking cty v0.1.5
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]     Checking cty v0.2.0
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling ndless-static-vars v1.0.0
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking unicode-segmentation v1.3.0
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stdout] error[E0412]: cannot find type `Vec` in this scope
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:34
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stdout]   |                                  ^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 5 | use alloc::vec::Vec;
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::v1::Vec;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `String` in this scope
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stdout]   |                                      ^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 5 | use alloc::string::String;
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::v1::String;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'alloc_prelude'
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use alloc::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #58935 <https://github.com/rust-lang/rust/issues/58935> for more information
[INFO] [stdout]   = help: add `#![feature(alloc_prelude)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Vec` in this scope
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:34
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stdout]   |                                  ^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 5 | use alloc::vec::Vec;
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::v1::Vec;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `String` in this scope
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub static mut ARGUMENTS: Option<Vec<String>> = None;
[INFO] [stdout]   |                                      ^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 5 | use alloc::string::String;
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::v1::String;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'alloc_prelude'
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ndless-static-vars-1.0.0/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use alloc::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #58935 <https://github.com/rust-lang/rust/issues/58935> for more information
[INFO] [stdout]   = help: add `#![feature(alloc_prelude)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "8f765899d7cf4229afa085b2552a6d6a5082d64a4c304f856b40356a27cfa21e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f765899d7cf4229afa085b2552a6d6a5082d64a4c304f856b40356a27cfa21e", kill_on_drop: false }`
[INFO] [stdout] 8f765899d7cf4229afa085b2552a6d6a5082d64a4c304f856b40356a27cfa21e