[INFO] fetching crate onlinecode 0.1.1...
[INFO] testing onlinecode-0.1.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate onlinecode 0.1.1 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate onlinecode 0.1.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate onlinecode 0.1.1
[INFO] finished tweaking crates.io crate onlinecode 0.1.1
[INFO] tweaked toml for crates.io crate onlinecode 0.1.1 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate crates.io crate onlinecode 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d46724ca6e2890ce28edb78874462185fbca78625a33d38b9b5989371b2916ba
[INFO] running `Command { std: "docker" "start" "-a" "d46724ca6e2890ce28edb78874462185fbca78625a33d38b9b5989371b2916ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d46724ca6e2890ce28edb78874462185fbca78625a33d38b9b5989371b2916ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d46724ca6e2890ce28edb78874462185fbca78625a33d38b9b5989371b2916ba", kill_on_drop: false }`
[INFO] [stdout] d46724ca6e2890ce28edb78874462185fbca78625a33d38b9b5989371b2916ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 453f4483a5f2c6edb9d71e71b7d9ed2c66774ec3abd8bfa8a20fa528a76e8196
[INFO] running `Command { std: "docker" "start" "-a" "453f4483a5f2c6edb9d71e71b7d9ed2c66774ec3abd8bfa8a20fa528a76e8196", kill_on_drop: false }`
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling onlinecode v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand::rngs::StdRng`
[INFO] [stdout]  --> src/probdist.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use rand::rngs::StdRng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/probdist.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::*`
[INFO] [stdout]   --> src/rng.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | use crate::*;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Sha1`
[INFO] [stdout]   --> src/rng.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 | use sha1::{Sha1, Digest};
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::rngs::StdRng`
[INFO] [stdout]   --> src/floyd.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | use rand::rngs::StdRng;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]   --> src/bipartite.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | use std::ops::Deref;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/equations.rs:8:32
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::collections::{HashSet,HashMap};
[INFO] [stdout]   |                                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/equations.rs:416:36
[INFO] [stdout]     |
[INFO] [stdout] 416 | ...                   if (*eq_id >= self.ablocks) {
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread_rng`
[INFO] [stdout]  --> src/compat.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng,thread_rng};
[INFO] [stdout]   |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rng`
[INFO] [stdout]  --> src/compat.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::rng;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/compat.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg`
[INFO] [stdout]    --> src/bipartite.rs:166:18
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn with_size(msg : u32, aux : u32, chk : u32, edges : u32) {
[INFO] [stdout]     |                  ^^^ help: if this is intentional, prefix it with an underscore: `_msg`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `aux`
[INFO] [stdout]    --> src/bipartite.rs:166:29
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn with_size(msg : u32, aux : u32, chk : u32, edges : u32) {
[INFO] [stdout]     |                             ^^^ help: if this is intentional, prefix it with an underscore: `_aux`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chk`
[INFO] [stdout]    --> src/bipartite.rs:166:40
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn with_size(msg : u32, aux : u32, chk : u32, edges : u32) {
[INFO] [stdout]     |                                        ^^^ help: if this is intentional, prefix it with an underscore: `_chk`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `edges`
[INFO] [stdout]    --> src/bipartite.rs:166:51
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn with_size(msg : u32, aux : u32, chk : u32, edges : u32) {
[INFO] [stdout]     |                                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_edges`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hash`
[INFO] [stdout]    --> src/equations.rs:298:40
[INFO] [stdout]     |
[INFO] [stdout] 298 |             EquationType::Unsolved(ref hash,_) => {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_hash`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `found_solved` is assigned to, but never used
[INFO] [stdout]    --> src/equations.rs:353:21
[INFO] [stdout]     |
[INFO] [stdout] 353 |             let mut found_solved = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_found_solved` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rhs`
[INFO] [stdout]    --> src/equations.rs:363:44
[INFO] [stdout]     |
[INFO] [stdout] 363 |                     EquationType::Solved(v,rhs) => {
[INFO] [stdout]     |                                            ^^^ help: if this is intentional, prefix it with an underscore: `_rhs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/equations.rs:205:13
[INFO] [stdout]     |
[INFO] [stdout] 205 |         let mut equations = Vec::with_capacity(coblocks + headroom);
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/equations.rs:233:17
[INFO] [stdout]     |
[INFO] [stdout] 233 |             let mut rhs = Vec::<VarID>::new();
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `right_degree`
[INFO] [stdout]   --> src/bipartite.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn right_degree(&self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `with_size`
[INFO] [stdout]    --> src/bipartite.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn with_size(msg : u32, aux : u32, chk : u32, edges : u32) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_edge`
[INFO] [stdout]    --> src/bipartite.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn new_edge() {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 23 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/bin/codec.rs:19:1
[INFO] [stdout]    |
[INFO] [stdout] 19 | #![feature(destructuring_assignment)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Arg`
[INFO] [stdout]   --> src/bin/codec.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | use clap::{Arg, App};
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Sha1`
[INFO] [stdout]   --> src/bin/codec.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | use sha1::{Sha1, Digest};
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `onlinecode` due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "453f4483a5f2c6edb9d71e71b7d9ed2c66774ec3abd8bfa8a20fa528a76e8196", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "453f4483a5f2c6edb9d71e71b7d9ed2c66774ec3abd8bfa8a20fa528a76e8196", kill_on_drop: false }`
[INFO] [stdout] 453f4483a5f2c6edb9d71e71b7d9ed2c66774ec3abd8bfa8a20fa528a76e8196