[INFO] cloning repository https://github.com/ihcsim/rust-101
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ihcsim/rust-101" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fihcsim%2Frust-101", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fihcsim%2Frust-101'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
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[INFO] checking ihcsim/rust-101 against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fihcsim%2Frust-101" "/workspace/builds/worker-42/source", kill_on_drop: false }`
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[INFO] validating manifest of git repo https://github.com/ihcsim/rust-101 on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ihcsim/rust-101
[INFO] finished tweaking git repo https://github.com/ihcsim/rust-101
[INFO] tweaked toml for git repo https://github.com/ihcsim/rust-101 written to /workspace/builds/worker-42/source/Cargo.toml
[INFO] crate git repo https://github.com/ihcsim/rust-101 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "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-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b3a00716defbd1ef67e307598ebbd4f5abfa49906e3e6cbeea768ef0ed2b660b
[INFO] running `Command { std: "docker" "start" "-a" "b3a00716defbd1ef67e307598ebbd4f5abfa49906e3e6cbeea768ef0ed2b660b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b3a00716defbd1ef67e307598ebbd4f5abfa49906e3e6cbeea768ef0ed2b660b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3a00716defbd1ef67e307598ebbd4f5abfa49906e3e6cbeea768ef0ed2b660b", kill_on_drop: false }`
[INFO] [stdout] b3a00716defbd1ef67e307598ebbd4f5abfa49906e3e6cbeea768ef0ed2b660b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d527ac4be29a11b788bd7ca78999684f0464075111b4343f3fed2df5a6509a83
[INFO] running `Command { std: "docker" "start" "-a" "d527ac4be29a11b788bd7ca78999684f0464075111b4343f3fed2df5a6509a83", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking rust-101 v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/bin/test-1.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/employees.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/ipaddr.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/strings.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/functions.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/highest_generic.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/carol.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/hello_cargo.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/variables.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/closure.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/conversion.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/structures.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/calc_all.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/rectangle.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/traits.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/lifetime.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/enumerations.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/fibonacci.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/binary_tree.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/branches.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/highest.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/errors.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/hashmap.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/matches.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/pig_latin.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/guessing_game.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/vector.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/bin/ipaddr.rs (2 fixes)
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/ipaddr.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/ipaddr.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/structures.rs (1 fix)
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/bin/structures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/bin/structures.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/bin/structures.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/traits.rs (5 fixes)
[INFO] [stdout] warning: enum is never used: `BinaryTree`
[INFO] [stdout]  --> src/bin/binary_tree.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum BinaryTree {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tree_weight_v1`
[INFO] [stdout]   --> src/bin/binary_tree.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn tree_weight_v1(t: &BinaryTree) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sample_tree`
[INFO] [stdout]   --> src/bin/binary_tree.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn sample_tree() -> BinaryTree {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_to_ordinal`
[INFO] [stdout]   --> src/bin/binary_tree.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn num_to_ordinal(x: u32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_to_ordinal_expr`
[INFO] [stdout]   --> src/bin/binary_tree.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn num_to_ordinal_expr(x: u32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/enumerations.rs (2 fixes)
[INFO] [stderr]        Fixed src/bin/lifetime.rs (1 fix)
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/enumerations.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enumerations.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/bin/lifetime.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     part: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/enumerations.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enumerations.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/ipaddr.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/ipaddr.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/bin/lifetime.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     part: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/matches.rs (2 fixes)
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/bin/matches.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/bin/matches.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/bin/matches.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/matches.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/errors.rs (5 fixes)
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/bin/errors.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/bin/errors.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/bin/closure.rs (1 fix)
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/bin/matches.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/bin/matches.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/bin/matches.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/matches.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/bin/structures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/bin/structures.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/bin/structures.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.44s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking rust-101 v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/enumerations.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enumerations.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `BinaryTree`
[INFO] [stdout]  --> src/bin/binary_tree.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum BinaryTree {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tree_weight_v1`
[INFO] [stdout]   --> src/bin/binary_tree.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn tree_weight_v1(t: &BinaryTree) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sample_tree`
[INFO] [stdout]   --> src/bin/binary_tree.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn sample_tree() -> BinaryTree {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_to_ordinal`
[INFO] [stdout]   --> src/bin/binary_tree.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn num_to_ordinal(x: u32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_to_ordinal_expr`
[INFO] [stdout]   --> src/bin/binary_tree.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn num_to_ordinal_expr(x: u32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Cacher`
[INFO] [stdout]   --> src/bin/closure.rs:77:21
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut c = Cacher::new(|a| a);
[INFO] [stdout]    |                     ^^^^^^ not found in this scope
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]    |
[INFO] [stdout] 76 |     use crate::Cacher;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/ipaddr.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/ipaddr.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/bin/errors.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-101` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/bin/structures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/bin/structures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/bin/structures.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/bin/structures.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/bin/structures.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/bin/structures.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/bin/lifetime.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     part: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/bin/lifetime.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     part: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/bin/matches.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/bin/matches.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/bin/matches.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/matches.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/bin/matches.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/bin/matches.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/bin/matches.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/matches.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/ipaddr.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/ipaddr.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/bin/errors.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/enumerations.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enumerations.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stderr] error: failed to check after updating to 2021
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo check --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "d527ac4be29a11b788bd7ca78999684f0464075111b4343f3fed2df5a6509a83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d527ac4be29a11b788bd7ca78999684f0464075111b4343f3fed2df5a6509a83", kill_on_drop: false }`
[INFO] [stdout] d527ac4be29a11b788bd7ca78999684f0464075111b4343f3fed2df5a6509a83