[INFO] cloning repository https://github.com/ikkyuuq/flex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ikkyuuq/flex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fikkyuuq%2Fflex", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fikkyuuq%2Fflex'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b2181ba4f559e63ceba49b7bfecc46082246e189
[INFO] checking ikkyuuq/flex against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fikkyuuq%2Fflex" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ikkyuuq/flex
[INFO] finished tweaking git repo https://github.com/ikkyuuq/flex
[INFO] tweaked toml for git repo https://github.com/ikkyuuq/flex written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ikkyuuq/flex on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ikkyuuq/flex 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bb107b307752d8fff03f9361987da6798b62ad17e495dfc8ddc826df4f13e376
[INFO] running `Command { std: "docker" "start" "-a" "bb107b307752d8fff03f9361987da6798b62ad17e495dfc8ddc826df4f13e376", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb107b307752d8fff03f9361987da6798b62ad17e495dfc8ddc826df4f13e376", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb107b307752d8fff03f9361987da6798b62ad17e495dfc8ddc826df4f13e376", kill_on_drop: false }`
[INFO] [stdout] bb107b307752d8fff03f9361987da6798b62ad17e495dfc8ddc826df4f13e376
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab8ab0576e53a1464e020e2e7f47bdd5f7c828d5b797750c8c8ba80a5c77ad66
[INFO] running `Command { std: "docker" "start" "-a" "ab8ab0576e53a1464e020e2e7f47bdd5f7c828d5b797750c8c8ba80a5c77ad66", kill_on_drop: false }`
[INFO] [stderr]     Checking flex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::env::args`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::env::args;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env::args`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::env::args;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `MissingCommand` is never constructed
[INFO] [stdout]   --> src/main.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub enum AppError {
[INFO] [stdout]    |              -------- variant in this enum
[INFO] [stdout] 70 |         MissingCommand,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `AppError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `add_command` is never used
[INFO] [stdout]    --> src/main.rs:112:16
[INFO] [stdout]     |
[INFO] [stdout]  94 |     impl App {
[INFO] [stdout]     |     -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 112 |         pub fn add_command(mut self, cmd: Command) -> Self {
[INFO] [stdout]     |                ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `InvalidConfiguration` is never constructed
[INFO] [stdout]    --> src/main.rs:235:13
[INFO] [stdout]     |
[INFO] [stdout] 231 |         pub enum CommandError {
[INFO] [stdout]     |                  ------------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 235 |             InvalidConfiguration(String),
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `CommandError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `flex` is never used
[INFO] [stdout]    --> src/main.rs:614:20
[INFO] [stdout]     |
[INFO] [stdout] 606 |         impl Arg {
[INFO] [stdout]     |         -------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 614 |             pub fn flex(flag: Arg) -> Self {
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `flex` is never used
[INFO] [stdout]    --> src/main.rs:658:20
[INFO] [stdout]     |
[INFO] [stdout] 650 |         impl Flag {
[INFO] [stdout]     |         --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 658 |             pub fn flex(flag: Flag) -> Self {
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `MissingCommand` is never constructed
[INFO] [stdout]   --> src/main.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub enum AppError {
[INFO] [stdout]    |              -------- variant in this enum
[INFO] [stdout] 70 |         MissingCommand,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `AppError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `add_command` is never used
[INFO] [stdout]    --> src/main.rs:112:16
[INFO] [stdout]     |
[INFO] [stdout]  94 |     impl App {
[INFO] [stdout]     |     -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 112 |         pub fn add_command(mut self, cmd: Command) -> Self {
[INFO] [stdout]     |                ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `InvalidConfiguration` is never constructed
[INFO] [stdout]    --> src/main.rs:235:13
[INFO] [stdout]     |
[INFO] [stdout] 231 |         pub enum CommandError {
[INFO] [stdout]     |                  ------------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 235 |             InvalidConfiguration(String),
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `CommandError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `flex` is never used
[INFO] [stdout]    --> src/main.rs:614:20
[INFO] [stdout]     |
[INFO] [stdout] 606 |         impl Arg {
[INFO] [stdout]     |         -------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 614 |             pub fn flex(flag: Arg) -> Self {
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `flex` is never used
[INFO] [stdout]    --> src/main.rs:658:20
[INFO] [stdout]     |
[INFO] [stdout] 650 |         impl Flag {
[INFO] [stdout]     |         --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 658 |             pub fn flex(flag: Flag) -> Self {
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "ab8ab0576e53a1464e020e2e7f47bdd5f7c828d5b797750c8c8ba80a5c77ad66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab8ab0576e53a1464e020e2e7f47bdd5f7c828d5b797750c8c8ba80a5c77ad66", kill_on_drop: false }`
[INFO] [stdout] ab8ab0576e53a1464e020e2e7f47bdd5f7c828d5b797750c8c8ba80a5c77ad66