[INFO] cloning repository https://github.com/imvivekvermaa/rust-all
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/imvivekvermaa/rust-all" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fimvivekvermaa%2Frust-all", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fimvivekvermaa%2Frust-all'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a40ca58d7b66a3fd9c5e20e158bab647d8104084
[INFO] checking imvivekvermaa/rust-all against try#3857be5045fe74bd0f296f6f4c23db10f8857f73 for pr-156807
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fimvivekvermaa%2Frust-all" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/imvivekvermaa/rust-all
[INFO] finished tweaking git repo https://github.com/imvivekvermaa/rust-all
[INFO] tweaked toml for git repo https://github.com/imvivekvermaa/rust-all written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/imvivekvermaa/rust-all on toolchain 3857be5045fe74bd0f296f6f4c23db10f8857f73
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/imvivekvermaa/rust-all 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" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7bab6e5eb9c41bad9a271930fb205570ca3da561611c33e5e7e90cee98e36bed
[INFO] running `Command { std: "docker" "start" "-a" "7bab6e5eb9c41bad9a271930fb205570ca3da561611c33e5e7e90cee98e36bed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7bab6e5eb9c41bad9a271930fb205570ca3da561611c33e5e7e90cee98e36bed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7bab6e5eb9c41bad9a271930fb205570ca3da561611c33e5e7e90cee98e36bed", kill_on_drop: false }`
[INFO] [stdout] 7bab6e5eb9c41bad9a271930fb205570ca3da561611c33e5e7e90cee98e36bed
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+3857be5045fe74bd0f296f6f4c23db10f8857f73" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 015483be622dd89f96386afddde021ef3496381bbc3e1309fbc896e004047d2d
[INFO] running `Command { std: "docker" "start" "-a" "015483be622dd89f96386afddde021ef3496381bbc3e1309fbc896e004047d2d", kill_on_drop: false }`
[INFO] [stderr]     Checking new-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `array_example`
[INFO] [stdout]    --> src/main.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let array_example: [&str; 4] = ["apple", "nuts", "cat", "hooter"];
[INFO] [stdout]     |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_array_example`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array_example`
[INFO] [stdout]    --> src/main.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let array_example: [&str; 4] = ["apple", "nuts", "cat", "hooter"];
[INFO] [stdout]     |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_array_example`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `another_example`
[INFO] [stdout]    --> src/main.rs:138:9
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let another_example: [i32; 0] = []; //this is how we define empty array
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_example`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `another_example`
[INFO] [stdout]    --> src/main.rs:138:9
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let another_example: [i32; 0] = []; //this is how we define empty array
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_example`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `fav_color` is never read
[INFO] [stdout]   --> src/main.rs:77:31
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let mut fav_color: &str = "blue";
[INFO] [stdout]    |                               ^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 86 |     fav_color = "pink";
[INFO] [stdout]    |     ------------------ `fav_color` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `fav_color` is never read
[INFO] [stdout]   --> src/main.rs:77:31
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let mut fav_color: &str = "blue";
[INFO] [stdout]    |                               ^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 86 |     fav_color = "pink";
[INFO] [stdout]    |     ------------------ `fav_color` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]    --> src/main.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     let num: i32 = 4;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]    --> src/main.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     let num: i32 = 4;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/main.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 201 |     let result = if a == "hii" {
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/main.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 201 |     let result = if a == "hii" {
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `all_available_integers` is never used
[INFO] [stdout]   --> src/main.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn all_available_integers() {
[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 `all_available_integers` is never used
[INFO] [stdout]   --> src/main.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn all_available_integers() {
[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 `all_float_things` is never used
[INFO] [stdout]   --> src/main.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn all_float_things() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `all_float_things` is never used
[INFO] [stdout]   --> src/main.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn all_float_things() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `practice` is never used
[INFO] [stdout]   --> src/main.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn practice() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `practice` is never used
[INFO] [stdout]   --> src/main.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn practice() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_even` is never used
[INFO] [stdout]    --> src/main.rs:165:4
[INFO] [stdout]     |
[INFO] [stdout] 165 | fn is_even(nmbr: i32) -> bool {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_even` is never used
[INFO] [stdout]    --> src/main.rs:165:4
[INFO] [stdout]     |
[INFO] [stdout] 165 | fn is_even(nmbr: i32) -> bool {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `conditionals` is never used
[INFO] [stdout]    --> src/main.rs:173:4
[INFO] [stdout]     |
[INFO] [stdout] 173 | fn conditionals() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `conditionals` is never used
[INFO] [stdout]    --> src/main.rs:173:4
[INFO] [stdout]     |
[INFO] [stdout] 173 | fn conditionals() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loops` is never used
[INFO] [stdout]    --> src/main.rs:248:4
[INFO] [stdout]     |
[INFO] [stdout] 248 | fn loops() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_concepts` is never used
[INFO] [stdout]    --> src/main.rs:278:4
[INFO] [stdout]     |
[INFO] [stdout] 278 | fn ownership_concepts() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loops` is never used
[INFO] [stdout]    --> src/main.rs:248:4
[INFO] [stdout]     |
[INFO] [stdout] 248 | fn loops() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `strings_example` is never used
[INFO] [stdout]    --> src/main.rs:310:4
[INFO] [stdout]     |
[INFO] [stdout] 310 | fn strings_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_concepts` is never used
[INFO] [stdout]    --> src/main.rs:278:4
[INFO] [stdout]     |
[INFO] [stdout] 278 | fn ownership_concepts() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `strings_example` is never used
[INFO] [stdout]    --> src/main.rs:310:4
[INFO] [stdout]     |
[INFO] [stdout] 310 | fn strings_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `testing_references_and_borrowing` is never used
[INFO] [stdout]    --> src/main.rs:382:4
[INFO] [stdout]     |
[INFO] [stdout] 382 | fn testing_references_and_borrowing(sample: &mut String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `testing_references_and_borrowing` is never used
[INFO] [stdout]    --> src/main.rs:382:4
[INFO] [stdout]     |
[INFO] [stdout] 382 | fn testing_references_and_borrowing(sample: &mut String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiple_ref_restrictions` is never used
[INFO] [stdout]    --> src/main.rs:388:4
[INFO] [stdout]     |
[INFO] [stdout] 388 | fn multiple_ref_restrictions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiple_ref_restrictions` is never used
[INFO] [stdout]    --> src/main.rs:388:4
[INFO] [stdout]     |
[INFO] [stdout] 388 | fn multiple_ref_restrictions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dangling_ref` is never used
[INFO] [stdout]    --> src/main.rs:408:4
[INFO] [stdout]     |
[INFO] [stdout] 408 | fn dangling_ref() { // -> &String will throw error
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dangling_ref` is never used
[INFO] [stdout]    --> src/main.rs:408:4
[INFO] [stdout]     |
[INFO] [stdout] 408 | fn dangling_ref() { // -> &String will throw error
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_w_arrays_tuples` is never used
[INFO] [stdout]    --> src/main.rs:428:4
[INFO] [stdout]     |
[INFO] [stdout] 428 | fn ownership_w_arrays_tuples() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_w_arrays_tuples` is never used
[INFO] [stdout]    --> src/main.rs:428:4
[INFO] [stdout]     |
[INFO] [stdout] 428 | fn ownership_w_arrays_tuples() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "015483be622dd89f96386afddde021ef3496381bbc3e1309fbc896e004047d2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "015483be622dd89f96386afddde021ef3496381bbc3e1309fbc896e004047d2d", kill_on_drop: false }`
[INFO] [stdout] 015483be622dd89f96386afddde021ef3496381bbc3e1309fbc896e004047d2d