[INFO] updating cached repository https://github.com/abrcdf1023/rust_hello_world
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2462d7c3b501059af6235410bcf74c89ec86c8c4
[INFO] checking abrcdf1023/rust_hello_world against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world" "work/builds/worker-3/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/abrcdf1023/rust_hello_world on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/abrcdf1023/rust_hello_world
[INFO] finished tweaking git repo https://github.com/abrcdf1023/rust_hello_world
[INFO] tweaked toml for git repo https://github.com/abrcdf1023/rust_hello_world written to work/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/abrcdf1023/rust_hello_world already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] b0d07835d3850bab912de47255eeaa9a6905915c174e80f351bba9092f492673
[INFO] running `"docker" "start" "-a" "b0d07835d3850bab912de47255eeaa9a6905915c174e80f351bba9092f492673"`
[INFO] [stderr]     Checking rust_hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/datatype.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/datatype.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]    --> src/datatype.rs:102:14
[INFO] [stderr]     |
[INFO] [stderr] 102 |   let (x, y, z) = tup;
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:112:7
[INFO] [stderr]     |
[INFO] [stderr] 112 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:113:7
[INFO] [stderr]     |
[INFO] [stderr] 113 |   let a = [3; 5]; // equals let a = [3, 3, 3, 3, 3];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]    --> src/datatype.rs:102:14
[INFO] [stderr]     |
[INFO] [stderr] 102 |   let (x, y, z) = tup;
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:112:7
[INFO] [stderr]     |
[INFO] [stderr] 112 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:113:7
[INFO] [stderr]     |
[INFO] [stderr] 113 |   let a = [3; 5]; // equals let a = [3, 3, 3, 3, 3];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/datatype.rs:32:7
[INFO] [stderr]    |
[INFO] [stderr] 32 |   let mut y = 30;
[INFO] [stderr]    |       ----^
[INFO] [stderr]    |       |
[INFO] [stderr]    |       help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/datatype.rs:32:7
[INFO] [stderr]    |
[INFO] [stderr] 32 |   let mut y = 30;
[INFO] [stderr]    |       ----^
[INFO] [stderr]    |       |
[INFO] [stderr]    |       help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn guess_number() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables`
[INFO] [stderr]  --> src/datatype.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn variables() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables_shadowing`
[INFO] [stderr]   --> src/datatype.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub fn variables_shadowing() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types`
[INFO] [stderr]   --> src/datatype.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn data_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_integer`
[INFO] [stderr]   --> src/datatype.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn data_types_integer() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_float`
[INFO] [stderr]   --> src/datatype.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | pub fn data_types_float() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `numeric_operations`
[INFO] [stderr]   --> src/datatype.rs:61:1
[INFO] [stderr]    |
[INFO] [stderr] 61 | pub fn numeric_operations() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_boolean`
[INFO] [stderr]   --> src/datatype.rs:80:1
[INFO] [stderr]    |
[INFO] [stderr] 80 | pub fn data_types_boolean() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_char`
[INFO] [stderr]   --> src/datatype.rs:88:1
[INFO] [stderr]    |
[INFO] [stderr] 88 | pub fn data_types_char() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_types`
[INFO] [stderr]   --> src/datatype.rs:98:1
[INFO] [stderr]    |
[INFO] [stderr] 98 | pub fn compound_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn_with_parameters`
[INFO] [stderr]  --> src/my_functions.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]  --> src/my_functions.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_fn`
[INFO] [stderr]   --> src/my_functions.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn private_fn(x: i32, y: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn guess_number() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables`
[INFO] [stderr]  --> src/datatype.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn variables() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables_shadowing`
[INFO] [stderr]   --> src/datatype.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub fn variables_shadowing() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types`
[INFO] [stderr]   --> src/datatype.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn data_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_integer`
[INFO] [stderr]   --> src/datatype.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn data_types_integer() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_float`
[INFO] [stderr]   --> src/datatype.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | pub fn data_types_float() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `numeric_operations`
[INFO] [stderr]   --> src/datatype.rs:61:1
[INFO] [stderr]    |
[INFO] [stderr] 61 | pub fn numeric_operations() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_boolean`
[INFO] [stderr]   --> src/datatype.rs:80:1
[INFO] [stderr]    |
[INFO] [stderr] 80 | pub fn data_types_boolean() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_char`
[INFO] [stderr]   --> src/datatype.rs:88:1
[INFO] [stderr]    |
[INFO] [stderr] 88 | pub fn data_types_char() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_types`
[INFO] [stderr]   --> src/datatype.rs:98:1
[INFO] [stderr]    |
[INFO] [stderr] 98 | pub fn compound_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn_with_parameters`
[INFO] [stderr]  --> src/my_functions.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]  --> src/my_functions.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_fn`
[INFO] [stderr]   --> src/my_functions.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn private_fn(x: i32, y: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.11s
[INFO] running `"docker" "inspect" "b0d07835d3850bab912de47255eeaa9a6905915c174e80f351bba9092f492673"`
[INFO] running `"docker" "rm" "-f" "b0d07835d3850bab912de47255eeaa9a6905915c174e80f351bba9092f492673"`
[INFO] [stdout] b0d07835d3850bab912de47255eeaa9a6905915c174e80f351bba9092f492673