[INFO] cloning repository https://github.com/kpaxian/rust-lessons
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kpaxian/rust-lessons" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkpaxian%2Frust-lessons", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkpaxian%2Frust-lessons'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 17c58f1d96fd41059f522e9534f27530b31651cd
[INFO] testing kpaxian/rust-lessons against try#16fbf98f22730e073c09e7b03f0eafb87a295545 for pr-145628
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkpaxian%2Frust-lessons" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kpaxian/rust-lessons
[INFO] finished tweaking git repo https://github.com/kpaxian/rust-lessons
[INFO] tweaked toml for git repo https://github.com/kpaxian/rust-lessons written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kpaxian/rust-lessons on toolchain 16fbf98f22730e073c09e7b03f0eafb87a295545
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kpaxian/rust-lessons already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] testing kpaxian/rust-lessons against try#16fbf98f22730e073c09e7b03f0eafb87a295545 for pr-145628
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkpaxian%2Frust-lessons" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kpaxian/rust-lessons
[INFO] finished tweaking git repo https://github.com/kpaxian/rust-lessons
[INFO] tweaked toml for git repo https://github.com/kpaxian/rust-lessons written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kpaxian/rust-lessons on toolchain 16fbf98f22730e073c09e7b03f0eafb87a295545
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kpaxian/rust-lessons already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1c47fa042308beba5fd8c25cda758a382ebf759efad2babe304bbe536c17a627
[INFO] running `Command { std: "docker" "start" "-a" "1c47fa042308beba5fd8c25cda758a382ebf759efad2babe304bbe536c17a627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1c47fa042308beba5fd8c25cda758a382ebf759efad2babe304bbe536c17a627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c47fa042308beba5fd8c25cda758a382ebf759efad2babe304bbe536c17a627", kill_on_drop: false }`
[INFO] [stdout] 1c47fa042308beba5fd8c25cda758a382ebf759efad2babe304bbe536c17a627
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea0a4f7321eb07456af05e2aaa4d7b6e939ecd50dea86f45625576741f21d20f
[INFO] running `Command { std: "docker" "start" "-a" "ea0a4f7321eb07456af05e2aaa4d7b6e939ecd50dea86f45625576741f21d20f", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-lessons v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `greeting_file`
[INFO] [stdout]   --> src/lesson/errs/mod.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let greeting_file = match greeting_file_result {
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_greeting_file`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `init` is never used
[INFO] [stdout]  --> src/lesson/hmaps/mod.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn init() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `init` is never used
[INFO] [stdout]  --> src/lesson/errs/mod.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn init() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/lesson/errs/mod.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn read_username_from_file() -> Result<String, std::io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `file_open_handler` is never used
[INFO] [stdout]   --> src/lesson/errs/mod.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn file_open_handler() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/lesson/errs/mod.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn foo() {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lesson/errs/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     read_username_from_file();
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let _ = read_username_from_file();
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "ea0a4f7321eb07456af05e2aaa4d7b6e939ecd50dea86f45625576741f21d20f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea0a4f7321eb07456af05e2aaa4d7b6e939ecd50dea86f45625576741f21d20f", kill_on_drop: false }`
[INFO] [stdout] ea0a4f7321eb07456af05e2aaa4d7b6e939ecd50dea86f45625576741f21d20f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 654599f0f55078ce21fa8d9282905f4d02bdb36a18fbd0bbad653f30e98b4b8e
[INFO] running `Command { std: "docker" "start" "-a" "654599f0f55078ce21fa8d9282905f4d02bdb36a18fbd0bbad653f30e98b4b8e", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-lessons v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `greeting_file`
[INFO] [stdout]   --> src/lesson/errs/mod.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let greeting_file = match greeting_file_result {
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_greeting_file`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `init` is never used
[INFO] [stdout]  --> src/lesson/hmaps/mod.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn init() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `init` is never used
[INFO] [stdout]  --> src/lesson/errs/mod.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn init() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/lesson/errs/mod.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn read_username_from_file() -> Result<String, std::io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `file_open_handler` is never used
[INFO] [stdout]   --> src/lesson/errs/mod.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn file_open_handler() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/lesson/errs/mod.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn foo() {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lesson/errs/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     read_username_from_file();
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let _ = read_username_from_file();
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "654599f0f55078ce21fa8d9282905f4d02bdb36a18fbd0bbad653f30e98b4b8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "654599f0f55078ce21fa8d9282905f4d02bdb36a18fbd0bbad653f30e98b4b8e", kill_on_drop: false }`
[INFO] [stdout] 654599f0f55078ce21fa8d9282905f4d02bdb36a18fbd0bbad653f30e98b4b8e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 41f1089ec184a5cb18ceb9a089d1814fd2c546dc58178c94b891babda9ea813a
[INFO] running `Command { std: "docker" "start" "-a" "41f1089ec184a5cb18ceb9a089d1814fd2c546dc58178c94b891babda9ea813a", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `greeting_file`
[INFO] [stdout] 
[INFO] [stderr]   --> src/lesson/errs/mod.rs:34:9
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 34 |     let greeting_file = match greeting_file_result {
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_greeting_file`
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `init` is never used
[INFO] [stderr]  --> src/lesson/hmaps/mod.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn init() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `init` is never used
[INFO] [stderr]  --> src/lesson/errs/mod.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn init() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `read_username_from_file` is never used
[INFO] [stderr]   --> src/lesson/errs/mod.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn read_username_from_file() -> Result<String, std::io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `file_open_handler` is never used
[INFO] [stderr]   --> src/lesson/errs/mod.rs:32:4
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn file_open_handler() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `foo` is never used
[INFO] [stderr]   --> src/lesson/errs/mod.rs:49:4
[INFO] [stderr]    |
[INFO] [stderr] 49 | fn foo() {
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/lesson/errs/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     read_username_from_file();
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let _ = read_username_from_file();
[INFO] [stderr]   |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lessons` (bin "rust-lessons" test) generated 7 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_lessons-0535c1e28baded2e)
[INFO] running `Command { std: "docker" "inspect" "41f1089ec184a5cb18ceb9a089d1814fd2c546dc58178c94b891babda9ea813a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41f1089ec184a5cb18ceb9a089d1814fd2c546dc58178c94b891babda9ea813a", kill_on_drop: false }`
[INFO] [stdout] 41f1089ec184a5cb18ceb9a089d1814fd2c546dc58178c94b891babda9ea813a