[INFO] updating cached repository https://github.com/inakleinbottle/teach
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/inakleinbottle/teach
[INFO] [stderr]    ff1eb1e..22cef67  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 22cef67a64adb2442dd73f94f3bde3a530d402f5
[INFO] checking inakleinbottle/teach against try#e689e5eaefe96e6dc3ed5bb629c521b7d207aff7 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Finakleinbottle%2Fteach" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/inakleinbottle/teach on toolchain e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/inakleinbottle/teach
[INFO] finished tweaking git repo https://github.com/inakleinbottle/teach
[INFO] tweaked toml for git repo https://github.com/inakleinbottle/teach written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/inakleinbottle/teach already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "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" "/mnt/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8a3324c8dde804850b565427fb04fec77bce574bd11e97788142a763403dfe64
[INFO] running `"docker" "start" "-a" "8a3324c8dde804850b565427fb04fec77bce574bd11e97788142a763403dfe64"`
[INFO] [stderr]    Compiling winapi v0.3.8
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking ascii v0.9.3
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking latex v0.3.1
[INFO] [stderr]     Checking outparse v0.1.0 (https://github.com/inakleinbottle/texoutparse-rs.git#a1b51032)
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]     Checking winconsole v0.10.0
[INFO] [stderr]     Checking colored v1.8.0
[INFO] [stderr]     Checking simple_logger v1.3.0
[INFO] [stderr]     Checking confy v0.3.1
[INFO] [stderr]     Checking toml_edit v0.1.5
[INFO] [stderr]     Checking teach v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::io::prelude::*`
[INFO] [stderr]  --> src/course.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `debug`, `error`, `trace`
[INFO] [stderr]   --> src/course.rs:10:11
[INFO] [stderr]    |
[INFO] [stderr] 10 | use log::{debug, error, info, trace, warn};
[INFO] [stderr]    |           ^^^^^  ^^^^^        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PathBuf`
[INFO] [stderr]  --> src/preview.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::path::{Path, PathBuf};
[INFO] [stderr]   |                       ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `error`, `warn`
[INFO] [stderr]   --> src/preview.rs:11:11
[INFO] [stderr]    |
[INFO] [stderr] 11 | use log::{warn, error, info, trace};
[INFO] [stderr]    |           ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude::*`
[INFO] [stderr]  --> src/course.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `debug`, `error`, `trace`
[INFO] [stderr]   --> src/course.rs:10:11
[INFO] [stderr]    |
[INFO] [stderr] 10 | use log::{debug, error, info, trace, warn};
[INFO] [stderr]    |           ^^^^^  ^^^^^        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `PathBuf`
[INFO] [stderr]  --> src/preview.rs:4:23
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::path::{Path, PathBuf};
[INFO] [stderr]   |                       ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `error`, `warn`
[INFO] [stderr]   --> src/preview.rs:11:11
[INFO] [stderr]    |
[INFO] [stderr] 11 | use log::{warn, error, info, trace};
[INFO] [stderr]    |           ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/makefile.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/makefile.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/makefile.rs:191:9
[INFO] [stderr]     |
[INFO] [stderr] 191 |     let mut comp: Vec<&str> = components.iter().map(AsRef::as_ref).collect();
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `TEXINPUTS` should have a snake case name
[INFO] [stderr]    --> src/makefile.rs:144:13
[INFO] [stderr]     |
[INFO] [stderr] 144 |     let mut TEXINPUTS = String::from("export TEXINPUTS=../");
[INFO] [stderr]     |             ^^^^^^^^^ help: convert the identifier to snake case: `texinputs`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/makefile.rs:191:9
[INFO] [stderr]     |
[INFO] [stderr] 191 |     let mut comp: Vec<&str> = components.iter().map(AsRef::as_ref).collect();
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `TEXINPUTS` should have a snake case name
[INFO] [stderr]    --> src/makefile.rs:144:13
[INFO] [stderr]     |
[INFO] [stderr] 144 |     let mut TEXINPUTS = String::from("export TEXINPUTS=../");
[INFO] [stderr]     |             ^^^^^^^^^ help: convert the identifier to snake case: `texinputs`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Path`
[INFO] [stderr]  --> src/main.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::path::{Path, PathBuf};
[INFO] [stderr]   |                 ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Path`
[INFO] [stderr]  --> src/main.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::path::{Path, PathBuf};
[INFO] [stderr]   |                 ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 01s
[INFO] running `"docker" "inspect" "8a3324c8dde804850b565427fb04fec77bce574bd11e97788142a763403dfe64"`
[INFO] running `"docker" "rm" "-f" "8a3324c8dde804850b565427fb04fec77bce574bd11e97788142a763403dfe64"`
[INFO] [stdout] 8a3324c8dde804850b565427fb04fec77bce574bd11e97788142a763403dfe64