[INFO] cloning repository https://github.com/BenWiederhake/practical-floop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BenWiederhake/practical-floop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBenWiederhake%2Fpractical-floop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBenWiederhake%2Fpractical-floop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 953ecdbf4406fc4355e4d0c8ce4646053a0a4702
[INFO] checking BenWiederhake/practical-floop against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBenWiederhake%2Fpractical-floop" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BenWiederhake/practical-floop on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BenWiederhake/practical-floop
[INFO] finished tweaking git repo https://github.com/BenWiederhake/practical-floop
[INFO] tweaked toml for git repo https://github.com/BenWiederhake/practical-floop written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/BenWiederhake/practical-floop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 97e729638c61877af381ef17b6ac8c39cceff1c886167fa95454831a38e283ed
[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" "97e729638c61877af381ef17b6ac8c39cceff1c886167fa95454831a38e283ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "97e729638c61877af381ef17b6ac8c39cceff1c886167fa95454831a38e283ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97e729638c61877af381ef17b6ac8c39cceff1c886167fa95454831a38e283ed", kill_on_drop: false }`
[INFO] [stdout] 97e729638c61877af381ef17b6ac8c39cceff1c886167fa95454831a38e283ed
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "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] 02dc9932ffd590ec182970fc5dc255dc282c542db17439e4cd6f5d2b9b671f3d
[INFO] running `Command { std: "docker" "start" "-a" "02dc9932ffd590ec182970fc5dc255dc282c542db17439e4cd6f5d2b9b671f3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]     Checking practical-floop v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around pattern
[INFO] [stdout]    --> src/parse.rs:711:23
[INFO] [stdout]     |
[INFO] [stdout] 711 |                 Some(&(Token::End /*| Token::Else*/)) => {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around pattern
[INFO] [stdout]    --> src/parse.rs:711:23
[INFO] [stdout]     |
[INFO] [stdout] 711 |                 Some(&(Token::End /*| Token::Else*/)) => {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parse.rs:325:21
[INFO] [stdout]     |
[INFO] [stdout] 325 |               Join => vec![
[INFO] [stdout]     |  _____________________^
[INFO] [stdout] 326 | |                 unimplemented!(),
[INFO] [stdout]     | |                 ---------------- any code following this expression is unreachable
[INFO] [stdout] 327 | |             ],
[INFO] [stdout]     | |_____________^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/token.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         -------- matches any value
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout]    |         ^^^^^^^^^ unreachable pattern
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/token.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         -------- matches any value
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout] 16 |         Zero => unreachable!(),
[INFO] [stdout]    |         ^^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/token.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         -------- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 17 |         _ => format!("unknown (BUG) ({})", e), // unfixable
[INFO] [stdout]    |         ^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Overflow`
[INFO] [stdout]   --> src/token.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Overflow`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Underflow`
[INFO] [stdout]   --> src/token.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Underflow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/parse.rs:325:21
[INFO] [stdout]     |
[INFO] [stdout] 325 |               Join => vec![
[INFO] [stdout]     |  _____________________^
[INFO] [stdout] 326 | |                 unimplemented!(),
[INFO] [stdout]     | |                 ---------------- any code following this expression is unreachable
[INFO] [stdout] 327 | |             ],
[INFO] [stdout]     | |_____________^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/token.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         -------- matches any value
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout]    |         ^^^^^^^^^ unreachable pattern
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/token.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         -------- matches any value
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout] 16 |         Zero => unreachable!(),
[INFO] [stdout]    |         ^^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/token.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         -------- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 17 |         _ => format!("unknown (BUG) ({})", e), // unfixable
[INFO] [stdout]    |         ^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Overflow`
[INFO] [stdout]   --> src/token.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Overflow`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Underflow`
[INFO] [stdout]   --> src/token.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Underflow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Overflow` should have a snake case name
[INFO] [stdout]   --> src/token.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `overflow`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Underflow` should have a snake case name
[INFO] [stdout]   --> src/token.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout]    |         ^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `underflow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Overflow` should have a snake case name
[INFO] [stdout]   --> src/token.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Overflow => format!("cannot handle large naturals yet (BUG) ({})", e),
[INFO] [stdout]    |         ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `overflow`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Underflow` should have a snake case name
[INFO] [stdout]   --> src/token.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Underflow => format!("must be non-negative ({})", e),
[INFO] [stdout]    |         ^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `underflow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.67s
[INFO] running `Command { std: "docker" "inspect" "02dc9932ffd590ec182970fc5dc255dc282c542db17439e4cd6f5d2b9b671f3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02dc9932ffd590ec182970fc5dc255dc282c542db17439e4cd6f5d2b9b671f3d", kill_on_drop: false }`
[INFO] [stdout] 02dc9932ffd590ec182970fc5dc255dc282c542db17439e4cd6f5d2b9b671f3d