[INFO] fetching crate felt 0.2.0...
[INFO] checking felt-0.2.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate felt 0.2.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate felt 0.2.0 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 crates.io crate felt 0.2.0
[INFO] finished tweaking crates.io crate felt 0.2.0
[INFO] tweaked toml for crates.io crate felt 0.2.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate felt 0.2.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded dirs-sys v0.3.6
[INFO] [stderr]   Downloaded redox_syscall v0.2.8
[INFO] [stderr]   Downloaded libc v0.2.80
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 8e773c24292acdba3bd06bb461dde65824e05ae66edaa35abb93d62fd8aa9c1b
[INFO] running `Command { std: "docker" "start" "-a" "8e773c24292acdba3bd06bb461dde65824e05ae66edaa35abb93d62fd8aa9c1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e773c24292acdba3bd06bb461dde65824e05ae66edaa35abb93d62fd8aa9c1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e773c24292acdba3bd06bb461dde65824e05ae66edaa35abb93d62fd8aa9c1b", kill_on_drop: false }`
[INFO] [stdout] 8e773c24292acdba3bd06bb461dde65824e05ae66edaa35abb93d62fd8aa9c1b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 232b5184cf35c06f9d81c25338f258aa1f19ece15039913367b81c4264175f2e
[INFO] running `Command { std: "docker" "start" "-a" "232b5184cf35c06f9d81c25338f258aa1f19ece15039913367b81c4264175f2e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking dirs v3.0.2
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking felt v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Vec` is imported redundantly
[INFO] [stdout]  --> src/feltlib.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     use std::vec::Vec;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Vec` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Vec` is imported redundantly
[INFO] [stdout]  --> src/feltlib.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     use std::vec::Vec;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Vec` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `toml` is imported redundantly
[INFO] [stdout]  --> src/feltlib.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use toml;
[INFO] [stdout]   |         ^^^^ the item `toml` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `toml` is imported redundantly
[INFO] [stdout]  --> src/feltlib.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use toml;
[INFO] [stdout]   |         ^^^^ the item `toml` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `use_node_modules` is never read
[INFO] [stdout]   --> src/felt.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | struct FeltCommand<'a> {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 83 |     use_node_modules: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `FeltCommand` 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 `toml` is never read
[INFO] [stdout]   --> src/feltlib.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub struct FeltRcCommandSection {
[INFO] [stdout]    |                -------------------- field in this struct
[INFO] [stdout] 30 |         pub commands: Vec<FeltRcCommand>,
[INFO] [stdout] 31 |         pub toml: Option<toml::value::Table>,
[INFO] [stdout]    |             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `FeltRcCommandSection` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `use_node_modules` is never read
[INFO] [stdout]   --> src/felt.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | struct FeltCommand<'a> {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 83 |     use_node_modules: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `FeltCommand` 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 `toml` is never read
[INFO] [stdout]   --> src/feltlib.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub struct FeltRcCommandSection {
[INFO] [stdout]    |                -------------------- field in this struct
[INFO] [stdout] 30 |         pub commands: Vec<FeltRcCommand>,
[INFO] [stdout] 31 |         pub toml: Option<toml::value::Table>,
[INFO] [stdout]    |             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `FeltRcCommandSection` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.85s
[INFO] running `Command { std: "docker" "inspect" "232b5184cf35c06f9d81c25338f258aa1f19ece15039913367b81c4264175f2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "232b5184cf35c06f9d81c25338f258aa1f19ece15039913367b81c4264175f2e", kill_on_drop: false }`
[INFO] [stdout] 232b5184cf35c06f9d81c25338f258aa1f19ece15039913367b81c4264175f2e