[INFO] cloning repository https://github.com/NicolasLagaillardie/variables
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NicolasLagaillardie/variables" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicolasLagaillardie%2Fvariables", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicolasLagaillardie%2Fvariables'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b591bdf823545309575235fe49912a37c8cd740b
[INFO] checking NicolasLagaillardie/variables against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicolasLagaillardie%2Fvariables" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NicolasLagaillardie/variables on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NicolasLagaillardie/variables
[INFO] finished tweaking git repo https://github.com/NicolasLagaillardie/variables
[INFO] tweaked toml for git repo https://github.com/NicolasLagaillardie/variables written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/NicolasLagaillardie/variables already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1044a7f4d7f1db70681939571147f61be2d15634ca6679644d918b652be037fe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1044a7f4d7f1db70681939571147f61be2d15634ca6679644d918b652be037fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1044a7f4d7f1db70681939571147f61be2d15634ca6679644d918b652be037fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1044a7f4d7f1db70681939571147f61be2d15634ca6679644d918b652be037fe", kill_on_drop: false }`
[INFO] [stdout] 1044a7f4d7f1db70681939571147f61be2d15634ca6679644d918b652be037fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f2c437d06a13a7dc2e6be37cf43d49d62d2074681d542040e11f1d70d2607306
[INFO] running `Command { std: "docker" "start" "-a" "f2c437d06a13a7dc2e6be37cf43d49d62d2074681d542040e11f1d70d2607306", kill_on_drop: false }`
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]     --> src/main.rs:1229:5
[INFO] [stdout]      |
[INFO] [stdout] 1229 | use std::process;
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]     --> src/main.rs:1229:5
[INFO] [stdout]      |
[INFO] [stdout] 1229 | use std::process;
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/main.rs:722:14
[INFO] [stdout]     |
[INFO] [stdout] 722 |         _ => count += 1,
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/main.rs:732:9
[INFO] [stdout]     |
[INFO] [stdout] 732 |         count += 1;
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/main.rs:722:14
[INFO] [stdout]     |
[INFO] [stdout] 722 |         _ => count += 1,
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/main.rs:732:9
[INFO] [stdout]     |
[INFO] [stdout] 732 |         count += 1;
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:801:9
[INFO] [stdout]     |
[INFO] [stdout] 801 |     let mut s = String::new();
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:801:9
[INFO] [stdout]     |
[INFO] [stdout] 801 |     let mut s = String::new();
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/main.rs:468:5
[INFO] [stdout]     |
[INFO] [stdout] 468 |     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/main.rs:470:5
[INFO] [stdout]     |
[INFO] [stdout] 470 |     sign_in_count: u64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]    --> src/main.rs:471:5
[INFO] [stdout]     |
[INFO] [stdout] 471 |     active: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]    --> src/main.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     kind: IpAddrKind,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]    --> src/main.rs:595:5
[INFO] [stdout]     |
[INFO] [stdout] 595 |     address: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]    --> src/main.rs:647:6
[INFO] [stdout]     |
[INFO] [stdout] 647 | enum Message {
[INFO] [stdout]     |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/main.rs:659:5
[INFO] [stdout]     |
[INFO] [stdout] 659 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]    --> src/main.rs:665:5
[INFO] [stdout]     |
[INFO] [stdout] 665 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]    --> src/main.rs:666:5
[INFO] [stdout]     |
[INFO] [stdout] 666 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]    --> src/main.rs:983:4
[INFO] [stdout]     |
[INFO] [stdout] 983 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_improved`
[INFO] [stdout]     --> src/main.rs:1001:4
[INFO] [stdout]      |
[INFO] [stdout] 1001 | fn read_username_from_file_improved() -> Result<String, io::Error> {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_dynamic`
[INFO] [stdout]     --> src/main.rs:1019:4
[INFO] [stdout]      |
[INFO] [stdout] 1019 | fn read_username_from_file_dynamic() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarizable`
[INFO] [stdout]     --> src/main.rs:1140:4
[INFO] [stdout]      |
[INFO] [stdout] 1140 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]     --> src/main.rs:1163:8
[INFO] [stdout]      |
[INFO] [stdout] 1163 | struct Pair<T>{
[INFO] [stdout]      |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]     --> src/main.rs:1169:8
[INFO] [stdout]      |
[INFO] [stdout] 1169 |     fn new(x: T, y:T) -> Self{
[INFO] [stdout]      |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]     --> src/main.rs:1178:8
[INFO] [stdout]      |
[INFO] [stdout] 1178 |     fn cmp_display(&self){
[INFO] [stdout]      |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]     --> src/main.rs:1196:5
[INFO] [stdout]      |
[INFO] [stdout] 1196 |     part: &'a str,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]     --> src/main.rs:1219:4
[INFO] [stdout]      |
[INFO] [stdout] 1219 | 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: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/main.rs:468:5
[INFO] [stdout]     |
[INFO] [stdout] 468 |     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/main.rs:470:5
[INFO] [stdout]     |
[INFO] [stdout] 470 |     sign_in_count: u64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]    --> src/main.rs:471:5
[INFO] [stdout]     |
[INFO] [stdout] 471 |     active: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]    --> src/main.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     kind: IpAddrKind,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]    --> src/main.rs:595:5
[INFO] [stdout]     |
[INFO] [stdout] 595 |     address: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]    --> src/main.rs:647:6
[INFO] [stdout]     |
[INFO] [stdout] 647 | enum Message {
[INFO] [stdout]     |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/main.rs:659:5
[INFO] [stdout]     |
[INFO] [stdout] 659 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]    --> src/main.rs:665:5
[INFO] [stdout]     |
[INFO] [stdout] 665 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]    --> src/main.rs:666:5
[INFO] [stdout]     |
[INFO] [stdout] 666 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]    --> src/main.rs:983:4
[INFO] [stdout]     |
[INFO] [stdout] 983 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_improved`
[INFO] [stdout]     --> src/main.rs:1001:4
[INFO] [stdout]      |
[INFO] [stdout] 1001 | fn read_username_from_file_improved() -> Result<String, io::Error> {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_dynamic`
[INFO] [stdout]     --> src/main.rs:1019:4
[INFO] [stdout]      |
[INFO] [stdout] 1019 | fn read_username_from_file_dynamic() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarizable`
[INFO] [stdout]     --> src/main.rs:1140:4
[INFO] [stdout]      |
[INFO] [stdout] 1140 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]     --> src/main.rs:1163:8
[INFO] [stdout]      |
[INFO] [stdout] 1163 | struct Pair<T>{
[INFO] [stdout]      |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]     --> src/main.rs:1169:8
[INFO] [stdout]      |
[INFO] [stdout] 1169 |     fn new(x: T, y:T) -> Self{
[INFO] [stdout]      |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]     --> src/main.rs:1178:8
[INFO] [stdout]      |
[INFO] [stdout] 1178 |     fn cmp_display(&self){
[INFO] [stdout]      |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]     --> src/main.rs:1196:5
[INFO] [stdout]      |
[INFO] [stdout] 1196 |     part: &'a str,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]     --> src/main.rs:1219:4
[INFO] [stdout]      |
[INFO] [stdout] 1219 | 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: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.04s
[INFO] running `Command { std: "docker" "inspect" "f2c437d06a13a7dc2e6be37cf43d49d62d2074681d542040e11f1d70d2607306", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2c437d06a13a7dc2e6be37cf43d49d62d2074681d542040e11f1d70d2607306", kill_on_drop: false }`
[INFO] [stdout] f2c437d06a13a7dc2e6be37cf43d49d62d2074681d542040e11f1d70d2607306