[INFO] updating cached repository madeinfree/hello-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/madeinfree/hello-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/madeinfree/hello-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/madeinfree/hello-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/madeinfree/hello-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/madeinfree/hello-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/madeinfree/hello-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/madeinfree/hello-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 14cf9473fa1db4844cb0a6768ec4b46b45801ae7
[INFO] sha for GitHub repo madeinfree/hello-rust: 14cf9473fa1db4844cb0a6768ec4b46b45801ae7
[INFO] validating manifest of madeinfree/hello-rust on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of madeinfree/hello-rust on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing madeinfree/hello-rust
[INFO] finished frobbing madeinfree/hello-rust
[INFO] frobbed toml for madeinfree/hello-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/madeinfree/hello-rust/Cargo.toml
[INFO] started frobbing madeinfree/hello-rust
[INFO] finished frobbing madeinfree/hello-rust
[INFO] frobbed toml for madeinfree/hello-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/madeinfree/hello-rust/Cargo.toml
[INFO] crate madeinfree/hello-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing madeinfree/hello-rust against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/madeinfree/hello-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] af06199bed4f0d37a7aff1ef270c6e8cb6f662ae165baec5ec1ed01f4df36783
[INFO] running `"docker" "start" "-a" "af06199bed4f0d37a7aff1ef270c6e8cb6f662ae165baec5ec1ed01f4df36783"`
[INFO] [stderr]    Compiling rand v0.5.2
[INFO] [stderr]    Compiling hello v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:567:17
[INFO] [stderr]     |
[INFO] [stderr] 567 |   for number in (1..5) {
[INFO] [stderr]     |                 ^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/main.rs:254:3
[INFO] [stderr]     |
[INFO] [stderr] 254 |   println!("{}", "Run here?"); // Not run
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_code)] on by default
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]    --> src/main.rs:188:7
[INFO] [stderr]     |
[INFO] [stderr] 188 |   let f = match f {
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]    --> src/main.rs:301:7
[INFO] [stderr]     |
[INFO] [stderr] 301 |   let row = vec![
[INFO] [stderr]     |       ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]    --> src/main.rs:358:7
[INFO] [stderr]     |
[INFO] [stderr] 358 |   let six = plus_one(five);
[INFO] [stderr]     |       ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]    --> src/main.rs:359:7
[INFO] [stderr]     |
[INFO] [stderr] 359 |   let none = plus_one(None);
[INFO] [stderr]     |       ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]    --> src/main.rs:380:7
[INFO] [stderr]     |
[INFO] [stderr] 380 |   let home = IpAddr {
[INFO] [stderr]     |       ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]    --> src/main.rs:498:9
[INFO] [stderr]     |
[INFO] [stderr] 498 |     let r1 = &mut s;
[INFO] [stderr]     |         ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]    --> src/main.rs:500:7
[INFO] [stderr]     |
[INFO] [stderr] 500 |   let r2 = &mut s;
[INFO] [stderr]     |       ^^ help: consider prefixing with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/main.rs:53:3
[INFO] [stderr]    |
[INFO] [stderr] 53 |   fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_impl_trait_type`
[INFO] [stderr]   --> src/main.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | fn sample_impl_trait_type() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_generic_types`
[INFO] [stderr]    --> src/main.rs:151:1
[INFO] [stderr]     |
[INFO] [stderr] 151 | fn sample_generic_types() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_error_result`
[INFO] [stderr]    --> src/main.rs:177:1
[INFO] [stderr]     |
[INFO] [stderr] 177 | fn sample_error_result() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_error_panic`
[INFO] [stderr]    --> src/main.rs:250:1
[INFO] [stderr]     |
[INFO] [stderr] 250 | fn sample_error_panic() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_hash_map`
[INFO] [stderr]    --> src/main.rs:257:1
[INFO] [stderr]     |
[INFO] [stderr] 257 | fn sample_hash_map() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_vector`
[INFO] [stderr]    --> src/main.rs:285:1
[INFO] [stderr]     |
[INFO] [stderr] 285 | fn sample_vector() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_if_let`
[INFO] [stderr]    --> src/main.rs:309:1
[INFO] [stderr]     |
[INFO] [stderr] 309 | fn sample_if_let() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_match`
[INFO] [stderr]    --> src/main.rs:324:1
[INFO] [stderr]     |
[INFO] [stderr] 324 | fn sample_match() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_enum`
[INFO] [stderr]    --> src/main.rs:370:1
[INFO] [stderr]     |
[INFO] [stderr] 370 | fn sample_enum() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_method_syntax`
[INFO] [stderr]    --> src/main.rs:386:1
[INFO] [stderr]     |
[INFO] [stderr] 386 | fn sample_method_syntax() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_use_struct`
[INFO] [stderr]    --> src/main.rs:407:1
[INFO] [stderr]     |
[INFO] [stderr] 407 | fn sample_use_struct() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_defining_struct`
[INFO] [stderr]    --> src/main.rs:430:1
[INFO] [stderr]     |
[INFO] [stderr] 430 | fn sample_defining_struct() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_string_slice`
[INFO] [stderr]    --> src/main.rs:453:1
[INFO] [stderr]     |
[INFO] [stderr] 453 | fn sample_string_slice() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_slice_type`
[INFO] [stderr]    --> src/main.rs:478:1
[INFO] [stderr]     |
[INFO] [stderr] 478 | fn sample_slice_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_ownership_multi_ref`
[INFO] [stderr]    --> src/main.rs:494:1
[INFO] [stderr]     |
[INFO] [stderr] 494 | fn sample_ownership_multi_ref() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_ownership_ref`
[INFO] [stderr]    --> src/main.rs:507:1
[INFO] [stderr]     |
[INFO] [stderr] 507 | fn sample_ownership_ref() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_ownership`
[INFO] [stderr]    --> src/main.rs:536:1
[INFO] [stderr]     |
[INFO] [stderr] 536 | fn sample_ownership() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_control_flow`
[INFO] [stderr]    --> src/main.rs:562:1
[INFO] [stderr]     |
[INFO] [stderr] 562 | fn sample_control_flow() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_function_call`
[INFO] [stderr]    --> src/main.rs:609:1
[INFO] [stderr]     |
[INFO] [stderr] 609 | fn sample_function_call() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_type`
[INFO] [stderr]    --> src/main.rs:635:1
[INFO] [stderr]     |
[INFO] [stderr] 635 | fn sample_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_len`
[INFO] [stderr]    --> src/main.rs:643:1
[INFO] [stderr]     |
[INFO] [stderr] 643 | fn sample_len() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_rang`
[INFO] [stderr]    --> src/main.rs:648:1
[INFO] [stderr]     |
[INFO] [stderr] 648 | fn sample_rang() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait method `summarizeD` should have a snake case name
[INFO] [stderr]    --> src/main.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |     fn summarizeD(&self) -> String;
[INFO] [stderr]     |        ^^^^^^^^^^ help: convert the identifier to snake case: `summarize_d`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:223:5
[INFO] [stderr]     |
[INFO] [stderr] 223 |     File::open("./src/hello.txt")?.read_to_string(&mut s2);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable `commonS` should have a snake case name
[INFO] [stderr]    --> src/main.rs:455:7
[INFO] [stderr]     |
[INFO] [stderr] 455 |   let commonS = "Hello Common World";
[INFO] [stderr]     |       ^^^^^^^ help: convert the identifier to snake case: `common_s`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.84s
[INFO] running `"docker" "inspect" "af06199bed4f0d37a7aff1ef270c6e8cb6f662ae165baec5ec1ed01f4df36783"`
[INFO] running `"docker" "rm" "-f" "af06199bed4f0d37a7aff1ef270c6e8cb6f662ae165baec5ec1ed01f4df36783"`
[INFO] [stdout] af06199bed4f0d37a7aff1ef270c6e8cb6f662ae165baec5ec1ed01f4df36783
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/madeinfree/hello-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] d2036d472fefb78f8a4b914a48ebcb15a13a45a85ebaae3fa92c4c5652847a67
[INFO] running `"docker" "start" "-a" "d2036d472fefb78f8a4b914a48ebcb15a13a45a85ebaae3fa92c4c5652847a67"`
[INFO] [stderr]    Compiling hello v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:567:17
[INFO] [stderr]     |
[INFO] [stderr] 567 |   for number in (1..5) {
[INFO] [stderr]     |                 ^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/main.rs:254:3
[INFO] [stderr]     |
[INFO] [stderr] 254 |   println!("{}", "Run here?"); // Not run
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_code)] on by default
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]    --> src/main.rs:188:7
[INFO] [stderr]     |
[INFO] [stderr] 188 |   let f = match f {
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]    --> src/main.rs:301:7
[INFO] [stderr]     |
[INFO] [stderr] 301 |   let row = vec![
[INFO] [stderr]     |       ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]    --> src/main.rs:358:7
[INFO] [stderr]     |
[INFO] [stderr] 358 |   let six = plus_one(five);
[INFO] [stderr]     |       ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]    --> src/main.rs:359:7
[INFO] [stderr]     |
[INFO] [stderr] 359 |   let none = plus_one(None);
[INFO] [stderr]     |       ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]    --> src/main.rs:380:7
[INFO] [stderr]     |
[INFO] [stderr] 380 |   let home = IpAddr {
[INFO] [stderr]     |       ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]    --> src/main.rs:498:9
[INFO] [stderr]     |
[INFO] [stderr] 498 |     let r1 = &mut s;
[INFO] [stderr]     |         ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]    --> src/main.rs:500:7
[INFO] [stderr]     |
[INFO] [stderr] 500 |   let r2 = &mut s;
[INFO] [stderr]     |       ^^ help: consider prefixing with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/main.rs:53:3
[INFO] [stderr]    |
[INFO] [stderr] 53 |   fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_impl_trait_type`
[INFO] [stderr]   --> src/main.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | fn sample_impl_trait_type() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_generic_types`
[INFO] [stderr]    --> src/main.rs:151:1
[INFO] [stderr]     |
[INFO] [stderr] 151 | fn sample_generic_types() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_error_result`
[INFO] [stderr]    --> src/main.rs:177:1
[INFO] [stderr]     |
[INFO] [stderr] 177 | fn sample_error_result() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_error_panic`
[INFO] [stderr]    --> src/main.rs:250:1
[INFO] [stderr]     |
[INFO] [stderr] 250 | fn sample_error_panic() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_hash_map`
[INFO] [stderr]    --> src/main.rs:257:1
[INFO] [stderr]     |
[INFO] [stderr] 257 | fn sample_hash_map() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_vector`
[INFO] [stderr]    --> src/main.rs:285:1
[INFO] [stderr]     |
[INFO] [stderr] 285 | fn sample_vector() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_if_let`
[INFO] [stderr]    --> src/main.rs:309:1
[INFO] [stderr]     |
[INFO] [stderr] 309 | fn sample_if_let() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_match`
[INFO] [stderr]    --> src/main.rs:324:1
[INFO] [stderr]     |
[INFO] [stderr] 324 | fn sample_match() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_enum`
[INFO] [stderr]    --> src/main.rs:370:1
[INFO] [stderr]     |
[INFO] [stderr] 370 | fn sample_enum() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_method_syntax`
[INFO] [stderr]    --> src/main.rs:386:1
[INFO] [stderr]     |
[INFO] [stderr] 386 | fn sample_method_syntax() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_use_struct`
[INFO] [stderr]    --> src/main.rs:407:1
[INFO] [stderr]     |
[INFO] [stderr] 407 | fn sample_use_struct() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_defining_struct`
[INFO] [stderr]    --> src/main.rs:430:1
[INFO] [stderr]     |
[INFO] [stderr] 430 | fn sample_defining_struct() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_string_slice`
[INFO] [stderr]    --> src/main.rs:453:1
[INFO] [stderr]     |
[INFO] [stderr] 453 | fn sample_string_slice() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_slice_type`
[INFO] [stderr]    --> src/main.rs:478:1
[INFO] [stderr]     |
[INFO] [stderr] 478 | fn sample_slice_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_ownership_multi_ref`
[INFO] [stderr]    --> src/main.rs:494:1
[INFO] [stderr]     |
[INFO] [stderr] 494 | fn sample_ownership_multi_ref() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_ownership_ref`
[INFO] [stderr]    --> src/main.rs:507:1
[INFO] [stderr]     |
[INFO] [stderr] 507 | fn sample_ownership_ref() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_ownership`
[INFO] [stderr]    --> src/main.rs:536:1
[INFO] [stderr]     |
[INFO] [stderr] 536 | fn sample_ownership() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_control_flow`
[INFO] [stderr]    --> src/main.rs:562:1
[INFO] [stderr]     |
[INFO] [stderr] 562 | fn sample_control_flow() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_function_call`
[INFO] [stderr]    --> src/main.rs:609:1
[INFO] [stderr]     |
[INFO] [stderr] 609 | fn sample_function_call() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_type`
[INFO] [stderr]    --> src/main.rs:635:1
[INFO] [stderr]     |
[INFO] [stderr] 635 | fn sample_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_len`
[INFO] [stderr]    --> src/main.rs:643:1
[INFO] [stderr]     |
[INFO] [stderr] 643 | fn sample_len() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sample_rang`
[INFO] [stderr]    --> src/main.rs:648:1
[INFO] [stderr]     |
[INFO] [stderr] 648 | fn sample_rang() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait method `summarizeD` should have a snake case name
[INFO] [stderr]    --> src/main.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |     fn summarizeD(&self) -> String;
[INFO] [stderr]     |        ^^^^^^^^^^ help: convert the identifier to snake case: `summarize_d`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:223:5
[INFO] [stderr]     |
[INFO] [stderr] 223 |     File::open("./src/hello.txt")?.read_to_string(&mut s2);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable `commonS` should have a snake case name
[INFO] [stderr]    --> src/main.rs:455:7
[INFO] [stderr]     |
[INFO] [stderr] 455 |   let commonS = "Hello Common World";
[INFO] [stderr]     |       ^^^^^^^ help: convert the identifier to snake case: `common_s`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `"docker" "inspect" "d2036d472fefb78f8a4b914a48ebcb15a13a45a85ebaae3fa92c4c5652847a67"`
[INFO] running `"docker" "rm" "-f" "d2036d472fefb78f8a4b914a48ebcb15a13a45a85ebaae3fa92c4c5652847a67"`
[INFO] [stdout] d2036d472fefb78f8a4b914a48ebcb15a13a45a85ebaae3fa92c4c5652847a67
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/madeinfree/hello-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 25c4b159e23128d8ad5f08bfa829221c35500fb4291e776fb6e976c92a800090
[INFO] running `"docker" "start" "-a" "25c4b159e23128d8ad5f08bfa829221c35500fb4291e776fb6e976c92a800090"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hello-351e55ec4ffc4a24
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "25c4b159e23128d8ad5f08bfa829221c35500fb4291e776fb6e976c92a800090"`
[INFO] running `"docker" "rm" "-f" "25c4b159e23128d8ad5f08bfa829221c35500fb4291e776fb6e976c92a800090"`
[INFO] [stdout] 25c4b159e23128d8ad5f08bfa829221c35500fb4291e776fb6e976c92a800090