[INFO] fetching crate noargs 0.4.1...
[INFO] checking noargs-0.4.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate noargs 0.4.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate noargs 0.4.1
[INFO] finished tweaking crates.io crate noargs 0.4.1
[INFO] tweaked toml for crates.io crate noargs 0.4.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate noargs 0.4.1 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 crates.io crate noargs 0.4.1 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] f591ad222c58d707776271d1fcd192a8f4258a57ba5de854bd3fec12a56f01b4
[INFO] running `Command { std: "docker" "start" "-a" "f591ad222c58d707776271d1fcd192a8f4258a57ba5de854bd3fec12a56f01b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f591ad222c58d707776271d1fcd192a8f4258a57ba5de854bd3fec12a56f01b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f591ad222c58d707776271d1fcd192a8f4258a57ba5de854bd3fec12a56f01b4", kill_on_drop: false }`
[INFO] [stdout] f591ad222c58d707776271d1fcd192a8f4258a57ba5de854bd3fec12a56f01b4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 596b6dba83abdea7d956165cefd206b61fc46ad5048e937e9838d6e18d307c46
[INFO] running `Command { std: "docker" "start" "-a" "596b6dba83abdea7d956165cefd206b61fc46ad5048e937e9838d6e18d307c46", kill_on_drop: false }`
[INFO] [stderr]     Checking noargs v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function pointer comparisons do not produce meaningful results since their addresses are not guaranteed to be unique
[INFO] [stdout]    --> src/args.rs:174:5
[INFO] [stdout]     |
[INFO] [stdout] 121 | #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
[INFO] [stdout]     |                              --------- in this derive macro expansion
[INFO] [stdout] ...
[INFO] [stdout] 174 |     pub is_valid_flag_chars: fn(&str) -> bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the address of the same function can vary between different codegen units
[INFO] [stdout]     = note: furthermore, different functions could have the same address after being merged together
[INFO] [stdout]     = note: for more information visit <https://doc.rust-lang.org/nightly/core/ptr/fn.fn_addr_eq.html>
[INFO] [stdout]     = note: `#[warn(unpredictable_function_pointer_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function pointer comparisons do not produce meaningful results since their addresses are not guaranteed to be unique
[INFO] [stdout]    --> src/args.rs:174:5
[INFO] [stdout]     |
[INFO] [stdout] 121 | #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
[INFO] [stdout]     |                              --------- in this derive macro expansion
[INFO] [stdout] ...
[INFO] [stdout] 174 |     pub is_valid_flag_chars: fn(&str) -> bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the address of the same function can vary between different codegen units
[INFO] [stdout]     = note: furthermore, different functions could have the same address after being merged together
[INFO] [stdout]     = note: for more information visit <https://doc.rust-lang.org/nightly/core/ptr/fn.fn_addr_eq.html>
[INFO] [stdout]     = note: `#[warn(unpredictable_function_pointer_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]    --> src/opt.rs:428:39
[INFO] [stdout]     |
[INFO] [stdout] 428 |                 .present_and_then(|o| o.value().parse::<String>())
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `noargs` (lib test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "596b6dba83abdea7d956165cefd206b61fc46ad5048e937e9838d6e18d307c46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "596b6dba83abdea7d956165cefd206b61fc46ad5048e937e9838d6e18d307c46", kill_on_drop: false }`
[INFO] [stdout] 596b6dba83abdea7d956165cefd206b61fc46ad5048e937e9838d6e18d307c46