[INFO] updating cached repository TrueDoughnut/ProjectEuler
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/TrueDoughnut/ProjectEuler
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/TrueDoughnut/ProjectEuler" "work/ex/clippy-test-run/sources/stable/gh/TrueDoughnut/ProjectEuler"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/TrueDoughnut/ProjectEuler'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/TrueDoughnut/ProjectEuler" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/TrueDoughnut/ProjectEuler"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/TrueDoughnut/ProjectEuler'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c8152c9f02c8a7494a10c82b0c067668de42c4dc
[INFO] sha for GitHub repo TrueDoughnut/ProjectEuler: c8152c9f02c8a7494a10c82b0c067668de42c4dc
[INFO] validating manifest of TrueDoughnut/ProjectEuler on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of TrueDoughnut/ProjectEuler on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing TrueDoughnut/ProjectEuler
[INFO] finished frobbing TrueDoughnut/ProjectEuler
[INFO] frobbed toml for TrueDoughnut/ProjectEuler written to work/ex/clippy-test-run/sources/stable/gh/TrueDoughnut/ProjectEuler/Cargo.toml
[INFO] started frobbing TrueDoughnut/ProjectEuler
[INFO] finished frobbing TrueDoughnut/ProjectEuler
[INFO] frobbed toml for TrueDoughnut/ProjectEuler written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/TrueDoughnut/ProjectEuler/Cargo.toml
[INFO] crate TrueDoughnut/ProjectEuler has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting TrueDoughnut/ProjectEuler against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/TrueDoughnut/ProjectEuler:/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=forbid" "-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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9185f6b78f56e4e884263b05d570b58f8ee4450bdf72b8f0e746b32954257d1a
[INFO] running `"docker" "start" "-a" "9185f6b78f56e4e884263b05d570b58f8ee4450bdf72b8f0e746b32954257d1a"`
[INFO] [stderr]    Compiling num-bigint v0.2.1
[INFO] [stderr]     Checking ProjectEuler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]  --> src/even_fibonacci/mod.rs:5:15
[INFO] [stderr]   |
[INFO] [stderr] 5 |     while x < 4000000 {
[INFO] [stderr]   |               ^^^^^^^ help: consider: `4_000_000`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::unreadable_literal)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/even_fibonacci/mod.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |         return 1;
[INFO] [stderr]    |         ^^^^^^^^^ help: remove `return` as shown: `1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/even_fibonacci/mod.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         return 2;
[INFO] [stderr]    |         ^^^^^^^^^ help: remove `return` as shown: `2`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/even_fibonacci/mod.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |         return fib(x-1) + fib(x-2);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `fib(x-1) + fib(x-2)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     return vec;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `vec`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     return x;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `x`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     return x;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `x`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:69:5
[INFO] [stderr]    |
[INFO] [stderr] 69 |     return n.to_str_radix(10).contains("0");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `n.to_str_radix(10).contains("0")`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/main.rs:171:30
[INFO] [stderr]     |
[INFO] [stderr] 171 |     let vec = first_n_primes(250000);
[INFO] [stderr]     |                              ^^^^^^ help: consider: `250_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/main.rs:174:21
[INFO] [stderr]     |
[INFO] [stderr] 174 |     while vec[i] <= 2000000 {
[INFO] [stderr]     |                     ^^^^^^^ help: consider: `2_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/main.rs:230:17
[INFO] [stderr]     |
[INFO] [stderr] 230 |     for i in 2..1000000 {
[INFO] [stderr]     |                 ^^^^^^^ help: consider: `1_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     return sum;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `sum`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:293:9
[INFO] [stderr]     |
[INFO] [stderr] 293 |         return n;
[INFO] [stderr]     |         ^^^^^^^^^ help: remove `return` as shown: `n`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:295:9
[INFO] [stderr]     |
[INFO] [stderr] 295 |         return n * factorial(n-1);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `n * factorial(n-1)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:310:5
[INFO] [stderr]     |
[INFO] [stderr] 310 |     return map;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `map`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:321:5
[INFO] [stderr]     |
[INFO] [stderr] 321 |     return -1;
[INFO] [stderr]     |     ^^^^^^^^^^ help: remove `return` as shown: `-1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     return vec;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `vec`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:363:5
[INFO] [stderr]     |
[INFO] [stderr] 363 |     return vec;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `vec`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:372:5
[INFO] [stderr]     |
[INFO] [stderr] 372 |     return true;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `true`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:384:5
[INFO] [stderr]     |
[INFO] [stderr] 384 |     return 2 * count;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `2 * count`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error[E0106]: missing lifetime specifier
[INFO] [stderr]   --> src/harder_problems/mod.rs:20:40
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn positive_integers(n: BigInt) -> Vec<&BigInt> {
[INFO] [stderr]    |                                        ^ help: consider giving it an explicit bounded or 'static lifetime: `&'static`
[INFO] [stderr]    |
[INFO] [stderr]    = help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0106`.
[INFO] [stderr] error: Could not compile `ProjectEuler`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]  --> src/even_fibonacci/mod.rs:5:15
[INFO] [stderr]   |
[INFO] [stderr] 5 |     while x < 4000000 {
[INFO] [stderr]   |               ^^^^^^^ help: consider: `4_000_000`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::unreadable_literal)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/even_fibonacci/mod.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |         return 1;
[INFO] [stderr]    |         ^^^^^^^^^ help: remove `return` as shown: `1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/even_fibonacci/mod.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         return 2;
[INFO] [stderr]    |         ^^^^^^^^^ help: remove `return` as shown: `2`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/even_fibonacci/mod.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |         return fib(x-1) + fib(x-2);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `fib(x-1) + fib(x-2)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     return vec;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `vec`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     return x;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `x`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     return x;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `x`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/harder_problems/mod.rs:69:5
[INFO] [stderr]    |
[INFO] [stderr] 69 |     return n.to_str_radix(10).contains("0");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `n.to_str_radix(10).contains("0")`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/main.rs:171:30
[INFO] [stderr]     |
[INFO] [stderr] 171 |     let vec = first_n_primes(250000);
[INFO] [stderr]     |                              ^^^^^^ help: consider: `250_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/main.rs:174:21
[INFO] [stderr]     |
[INFO] [stderr] 174 |     while vec[i] <= 2000000 {
[INFO] [stderr]     |                     ^^^^^^^ help: consider: `2_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/main.rs:230:17
[INFO] [stderr]     |
[INFO] [stderr] 230 |     for i in 2..1000000 {
[INFO] [stderr]     |                 ^^^^^^^ help: consider: `1_000_000`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     return sum;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `sum`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:293:9
[INFO] [stderr]     |
[INFO] [stderr] 293 |         return n;
[INFO] [stderr]     |         ^^^^^^^^^ help: remove `return` as shown: `n`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:295:9
[INFO] [stderr]     |
[INFO] [stderr] 295 |         return n * factorial(n-1);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `n * factorial(n-1)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:310:5
[INFO] [stderr]     |
[INFO] [stderr] 310 |     return map;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `map`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:321:5
[INFO] [stderr]     |
[INFO] [stderr] 321 |     return -1;
[INFO] [stderr]     |     ^^^^^^^^^^ help: remove `return` as shown: `-1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     return vec;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `vec`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:363:5
[INFO] [stderr]     |
[INFO] [stderr] 363 |     return vec;
[INFO] [stderr]     |     ^^^^^^^^^^^ help: remove `return` as shown: `vec`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:372:5
[INFO] [stderr]     |
[INFO] [stderr] 372 |     return true;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `true`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:384:5
[INFO] [stderr]     |
[INFO] [stderr] 384 |     return 2 * count;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `2 * count`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error[E0106]: missing lifetime specifier
[INFO] [stderr]   --> src/harder_problems/mod.rs:20:40
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn positive_integers(n: BigInt) -> Vec<&BigInt> {
[INFO] [stderr]    |                                        ^ help: consider giving it an explicit bounded or 'static lifetime: `&'static`
[INFO] [stderr]    |
[INFO] [stderr]    = help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0106`.
[INFO] [stderr] error: Could not compile `ProjectEuler`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9185f6b78f56e4e884263b05d570b58f8ee4450bdf72b8f0e746b32954257d1a"`
[INFO] running `"docker" "rm" "-f" "9185f6b78f56e4e884263b05d570b58f8ee4450bdf72b8f0e746b32954257d1a"`
[INFO] [stdout] 9185f6b78f56e4e884263b05d570b58f8ee4450bdf72b8f0e746b32954257d1a