[INFO] cloning repository https://github.com/ghotiphud/rust-intro
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ghotiphud/rust-intro" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghotiphud%2Frust-intro", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghotiphud%2Frust-intro'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c72640c3eb4a803d29bd3eb29798bcb85e9b4054
[INFO] testing ghotiphud/rust-intro against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghotiphud%2Frust-intro" "/workspace/builds/worker-95/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-95/source'...
[INFO] [stderr] done.
[INFO] [stderr] Updating files:  34% (46/133)
Updating files:  35% (47/133)
Updating files:  36% (48/133)
Updating files:  37% (50/133)
Updating files:  38% (51/133)
Updating files:  39% (52/133)
Updating files:  39% (53/133)
Updating files:  40% (54/133)
Updating files:  41% (55/133)
Updating files:  42% (56/133)
Updating files:  43% (58/133)
Updating files:  44% (59/133)
Updating files:  45% (60/133)
Updating files:  46% (62/133)
Updating files:  47% (63/133)
Updating files:  48% (64/133)
Updating files:  49% (66/133)
Updating files:  50% (67/133)
Updating files:  51% (68/133)
Updating files:  52% (70/133)
Updating files:  53% (71/133)
Updating files:  54% (72/133)
Updating files:  55% (74/133)
Updating files:  56% (75/133)
Updating files:  57% (76/133)
Updating files:  58% (78/133)
Updating files:  59% (79/133)
Updating files:  60% (80/133)
Updating files:  61% (82/133)
Updating files:  62% (83/133)
Updating files:  63% (84/133)
Updating files:  64% (86/133)
Updating files:  65% (87/133)
Updating files:  66% (88/133)
Updating files:  67% (90/133)
Updating files:  68% (91/133)
Updating files:  69% (92/133)
Updating files:  70% (94/133)
Updating files:  71% (95/133)
Updating files:  72% (96/133)
Updating files:  73% (98/133)
Updating files:  74% (99/133)
Updating files:  75% (100/133)
Updating files:  76% (102/133)
Updating files:  77% (103/133)
Updating files:  78% (104/133)
Updating files:  79% (106/133)
Updating files:  80% (107/133)
Updating files:  81% (108/133)
Updating files:  82% (110/133)
Updating files:  83% (111/133)
Updating files:  84% (112/133)
Updating files:  85% (114/133)
Updating files:  86% (115/133)
Updating files:  87% (116/133)
Updating files:  88% (118/133)
Updating files:  89% (119/133)
Updating files:  90% (120/133)
Updating files:  91% (122/133)
Updating files:  92% (123/133)
Updating files:  93% (124/133)
Updating files:  94% (126/133)
Updating files:  95% (127/133)
Updating files:  96% (128/133)
Updating files:  97% (130/133)
Updating files:  98% (131/133)
Updating files:  99% (132/133)
Updating files: 100% (133/133)
Updating files: 100% (133/133), done.
[INFO] validating manifest of git repo https://github.com/ghotiphud/rust-intro on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ghotiphud/rust-intro
[INFO] finished tweaking git repo https://github.com/ghotiphud/rust-intro
[INFO] tweaked toml for git repo https://github.com/ghotiphud/rust-intro written to /workspace/builds/worker-95/source/Cargo.toml
[INFO] crate git repo https://github.com/ghotiphud/rust-intro already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 40ef6d7e667e860073f581d520b79760e968777c87fcca562d0a969327b2b3c4
[INFO] running `Command { std: "docker" "start" "-a" "40ef6d7e667e860073f581d520b79760e968777c87fcca562d0a969327b2b3c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "40ef6d7e667e860073f581d520b79760e968777c87fcca562d0a969327b2b3c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40ef6d7e667e860073f581d520b79760e968777c87fcca562d0a969327b2b3c4", kill_on_drop: false }`
[INFO] [stdout] 40ef6d7e667e860073f581d520b79760e968777c87fcca562d0a969327b2b3c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 86bd3f983b0fb1727fdde19ec704575cc396ec5b1d3cb6a790662601d0dbc47c
[INFO] running `Command { std: "docker" "start" "-a" "86bd3f983b0fb1727fdde19ec704575cc396ec5b1d3cb6a790662601d0dbc47c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_intro v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/safety.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let y = &x[0]; //Borrow(Reference) the first element of x
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/safety.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut x = vec![10, 20]; //Create vec owned by x
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let y = &x[0]; //Borrow(Reference) the first element of x
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iterator`
[INFO] [stdout]  --> src/main.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn iterator() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum_pos`
[INFO] [stdout]   --> src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn sum_pos(v: &Vec<i32>) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/types.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut y = x as i64;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/types.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |         unsafe {
[INFO] [stdout]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `None`
[INFO] [stdout]   --> src/types.rs:54:16
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum Options { None, One, Two, Three }
[INFO] [stdout]    |                ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Two`
[INFO] [stdout]   --> src/types.rs:54:27
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum Options { None, One, Two, Three }
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Three`
[INFO] [stdout]   --> src/types.rs:54:32
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum Options { None, One, Two, Three }
[INFO] [stdout]    |                                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/types.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_intro` due to 2 previous errors; 5 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused return value of `collect` that must be used
[INFO] [stdout]    --> src/concurrent.rs:140:5
[INFO] [stdout]     |
[INFO] [stdout] 140 |     handles.into_iter().map(|h| h.join().unwrap()).collect::<Vec<_>>();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "86bd3f983b0fb1727fdde19ec704575cc396ec5b1d3cb6a790662601d0dbc47c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86bd3f983b0fb1727fdde19ec704575cc396ec5b1d3cb6a790662601d0dbc47c", kill_on_drop: false }`
[INFO] [stdout] 86bd3f983b0fb1727fdde19ec704575cc396ec5b1d3cb6a790662601d0dbc47c