[INFO] cloning repository https://github.com/kamojun/rnc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kamojun/rnc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkamojun%2Frnc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkamojun%2Frnc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8801db162ad26cb88f8758058078bdfaade813f6
[INFO] checking kamojun/rnc against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkamojun%2Frnc" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kamojun/rnc on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kamojun/rnc
[INFO] finished tweaking git repo https://github.com/kamojun/rnc
[INFO] tweaked toml for git repo https://github.com/kamojun/rnc written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kamojun/rnc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71e347090eccd521c63ea40452d1f14f2a587e6f503e5f1045f21111e924f1c8
[INFO] running `Command { std: "docker" "start" "-a" "71e347090eccd521c63ea40452d1f14f2a587e6f503e5f1045f21111e924f1c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71e347090eccd521c63ea40452d1f14f2a587e6f503e5f1045f21111e924f1c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71e347090eccd521c63ea40452d1f14f2a587e6f503e5f1045f21111e924f1c8", kill_on_drop: false }`
[INFO] [stdout] 71e347090eccd521c63ea40452d1f14f2a587e6f503e5f1045f21111e924f1c8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5421d6dbdeff05c902c5636a338c5dde6882046bd524a3022d528b466ac1d0fe
[INFO] running `Command { std: "docker" "start" "-a" "5421d6dbdeff05c902c5636a338c5dde6882046bd524a3022d528b466ac1d0fe", kill_on_drop: false }`
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking rnc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tokenize.rs:423:13
[INFO] [stdout]     |
[INFO] [stdout] 423 |         for mut tk in list.iter_mut() {
[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: field `msg` is never read
[INFO] [stdout]  --> src/ctype.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct TypeError {
[INFO] [stdout]   |            --------- field in this struct
[INFO] [stdout] 7 |     pub msg: String,
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TypeError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `is_extern` is never read
[INFO] [stdout]   --> src/parse/node.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub struct Var {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 11 |     pub is_extern: bool,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `ty` is never read
[INFO] [stdout]    --> src/parse/node.rs:142:9
[INFO] [stdout]     |
[INFO] [stdout] 141 | pub struct Function {
[INFO] [stdout]     |            -------- field in this struct
[INFO] [stdout] 142 |     pub ty: TypeRef,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tokenize.rs:423:13
[INFO] [stdout]     |
[INFO] [stdout] 423 |         for mut tk in list.iter_mut() {
[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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `msg` is never read
[INFO] [stdout]  --> src/ctype.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct TypeError {
[INFO] [stdout]   |            --------- field in this struct
[INFO] [stdout] 7 |     pub msg: String,
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TypeError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `is_extern` is never read
[INFO] [stdout]   --> src/parse/node.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub struct Var {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 11 |     pub is_extern: bool,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `ty` is never read
[INFO] [stdout]    --> src/parse/node.rs:142:9
[INFO] [stdout]     |
[INFO] [stdout] 141 | pub struct Function {
[INFO] [stdout]     |            -------- field in this struct
[INFO] [stdout] 142 |     pub ty: TypeRef,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "5421d6dbdeff05c902c5636a338c5dde6882046bd524a3022d528b466ac1d0fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5421d6dbdeff05c902c5636a338c5dde6882046bd524a3022d528b466ac1d0fe", kill_on_drop: false }`
[INFO] [stdout] 5421d6dbdeff05c902c5636a338c5dde6882046bd524a3022d528b466ac1d0fe