[INFO] cloning repository https://github.com/zesterer/funkicrab
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zesterer/funkicrab" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzesterer%2Ffunkicrab", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzesterer%2Ffunkicrab'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98528cc593478391a0ef0f91ff533592cf263914
[INFO] checking zesterer/funkicrab against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzesterer%2Ffunkicrab" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zesterer/funkicrab on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zesterer/funkicrab
[INFO] finished tweaking git repo https://github.com/zesterer/funkicrab
[INFO] tweaked toml for git repo https://github.com/zesterer/funkicrab written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/zesterer/funkicrab already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8bbb8098703c168808db463c90322f62cd37c0e3056ab18fba28651388d3f33b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8bbb8098703c168808db463c90322f62cd37c0e3056ab18fba28651388d3f33b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8bbb8098703c168808db463c90322f62cd37c0e3056ab18fba28651388d3f33b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bbb8098703c168808db463c90322f62cd37c0e3056ab18fba28651388d3f33b", kill_on_drop: false }`
[INFO] [stdout] 8bbb8098703c168808db463c90322f62cd37c0e3056ab18fba28651388d3f33b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=forbid" "-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b02baea63c74f3c98fdde0083b1a8d33daf37dead0822bc58c0f55330b100a21
[INFO] running `Command { std: "docker" "start" "-a" "b02baea63c74f3c98fdde0083b1a8d33daf37dead0822bc58c0f55330b100a21", kill_on_drop: false }`
[INFO] [stderr]     Checking bimap v0.1.5
[INFO] [stderr]     Checking funkicrab v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(label_break_value)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::Error`
[INFO] [stdout]  --> src/exec.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/hir.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iter::FromIterator`
[INFO] [stdout]  --> src/llir.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     iter::FromIterator,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/llir.rs:242:20
[INFO] [stdout]     |
[INFO] [stdout] 242 |                   if (if let CellAccessInfo::Exactly(cells) = &cell_reads {
[INFO] [stdout]     |  ____________________^
[INFO] [stdout] 243 | |                     cells.len() == 0
[INFO] [stdout] 244 | |                 } else {
[INFO] [stdout] 245 | |                     false
[INFO] [stdout] 246 | |                 }) {
[INFO] [stdout]     | |__________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 242 |                 if if let CellAccessInfo::Exactly(cells) = &cell_reads {
[INFO] [stdout] 243 |                     cells.len() == 0
[INFO] [stdout] 244 |                 } else {
[INFO] [stdout] 245 |                     false
[INFO] [stdout] 246 |                 } {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `CellAccessInfo`
[INFO] [stdout]  --> src/opt.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     CellAccessInfo,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(label_break_value)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::Error`
[INFO] [stdout]  --> src/exec.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/hir.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iter::FromIterator`
[INFO] [stdout]  --> src/llir.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     iter::FromIterator,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/llir.rs:242:20
[INFO] [stdout]     |
[INFO] [stdout] 242 |                   if (if let CellAccessInfo::Exactly(cells) = &cell_reads {
[INFO] [stdout]     |  ____________________^
[INFO] [stdout] 243 | |                     cells.len() == 0
[INFO] [stdout] 244 | |                 } else {
[INFO] [stdout] 245 | |                     false
[INFO] [stdout] 246 | |                 }) {
[INFO] [stdout]     | |__________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 242 |                 if if let CellAccessInfo::Exactly(cells) = &cell_reads {
[INFO] [stdout] 243 |                     cells.len() == 0
[INFO] [stdout] 244 |                 } else {
[INFO] [stdout] 245 |                     false
[INFO] [stdout] 246 |                 } {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `CellAccessInfo`
[INFO] [stdout]  --> src/opt.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     CellAccessInfo,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/opt.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | /     loop {
[INFO] [stdout] 66 | |         let new_prog = optimise_program(prog.clone());
[INFO] [stdout] 67 | |         if prog == new_prog {
[INFO] [stdout] 68 | |             return prog;
[INFO] [stdout] ...  |
[INFO] [stdout] 71 | |         }
[INFO] [stdout] 72 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 73 |       prog
[INFO] [stdout]    |       ^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 6 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 `funkicrab`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/opt.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | /     loop {
[INFO] [stdout] 66 | |         let new_prog = optimise_program(prog.clone());
[INFO] [stdout] 67 | |         if prog == new_prog {
[INFO] [stdout] 68 | |             return prog;
[INFO] [stdout] ...  |
[INFO] [stdout] 71 | |         }
[INFO] [stdout] 72 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 73 |       prog
[INFO] [stdout]    |       ^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b02baea63c74f3c98fdde0083b1a8d33daf37dead0822bc58c0f55330b100a21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b02baea63c74f3c98fdde0083b1a8d33daf37dead0822bc58c0f55330b100a21", kill_on_drop: false }`
[INFO] [stdout] b02baea63c74f3c98fdde0083b1a8d33daf37dead0822bc58c0f55330b100a21