[INFO] updating cached repository rotwatsb/code_kata
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rotwatsb/code_kata
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rotwatsb/code_kata" "work/ex/beta-1.38-1/sources/1.37.0/gh/rotwatsb/code_kata"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rotwatsb/code_kata'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rotwatsb/code_kata" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rotwatsb/code_kata"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rotwatsb/code_kata'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 232189e70ed0dbb1665ab38aacc282a839c80a63
[INFO] sha for GitHub repo rotwatsb/code_kata: 232189e70ed0dbb1665ab38aacc282a839c80a63
[INFO] validating manifest of rotwatsb/code_kata 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 rotwatsb/code_kata 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 rotwatsb/code_kata
[INFO] finished frobbing rotwatsb/code_kata
[INFO] frobbed toml for rotwatsb/code_kata written to work/ex/beta-1.38-1/sources/1.37.0/gh/rotwatsb/code_kata/Cargo.toml
[INFO] started frobbing rotwatsb/code_kata
[INFO] finished frobbing rotwatsb/code_kata
[INFO] frobbed toml for rotwatsb/code_kata written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rotwatsb/code_kata/Cargo.toml
[INFO] crate rotwatsb/code_kata 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] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/rotwatsb/code_kata/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rotwatsb/code_kata against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rotwatsb/code_kata:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 80a8022994ea101f3015592c8f4f671db8696cea45991e06b095b2242fd133da
[INFO] running `"docker" "start" "-a" "80a8022994ea101f3015592c8f4f671db8696cea45991e06b095b2242fd133da"`
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling code_kata v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(inclusive_range_syntax)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]   --> src/euler/longest_collatz_14.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 | /             (if n % 2 == 0 { 1 + cmp_collatz(n / 2, stored_vals) }
[INFO] [stderr] 30 | |              else { 1 + cmp_collatz(3 * n + 1, stored_vals) });
[INFO] [stderr]    | |______________________________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 29 |             if n % 2 == 0 { 1 + cmp_collatz(n / 2, stored_vals) }
[INFO] [stderr] 30 |              else { 1 + cmp_collatz(3 * n + 1, stored_vals) };
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/euler/triangular_12.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `utils`
[INFO] [stderr]  --> src/hackerrank/modfib.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use utils;
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/hackerrank/cut_the_tree.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]   --> src/hackerrank/knapsack.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 | /         (if sizes[n] > c {
[INFO] [stderr] 29 | |             if n == 0 { return 0; }
[INFO] [stderr] 30 | |             max_knapsack(c, n - 1, sizes, values, memoized)
[INFO] [stderr] 31 | |          }
[INFO] [stderr] ...  |
[INFO] [stderr] 35 | |                       max_knapsack(c, n - 1, sizes, values, memoized))
[INFO] [stderr] 36 | |          });
[INFO] [stderr]    | |___________^
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 28 |         if sizes[n] > c {
[INFO] [stderr] 29 |             if n == 0 { return 0; }
[INFO] [stderr] 30 |             max_knapsack(c, n - 1, sizes, values, memoized)
[INFO] [stderr] 31 |          }
[INFO] [stderr] 32 |          else {
[INFO] [stderr] 33 |              if n == 0 { return values[0]; }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/interviewbit/max_sum_path_in_binary_tree.rs:33:30
[INFO] [stderr]    |
[INFO] [stderr] 33 |     *max_sum = max(*max_sum, (sum_of_sums + vals[i]));
[INFO] [stderr]    |                              ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `code_kata`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "80a8022994ea101f3015592c8f4f671db8696cea45991e06b095b2242fd133da"`
[INFO] running `"docker" "rm" "-f" "80a8022994ea101f3015592c8f4f671db8696cea45991e06b095b2242fd133da"`
[INFO] [stdout] 80a8022994ea101f3015592c8f4f671db8696cea45991e06b095b2242fd133da