[INFO] cloning repository https://github.com/LiHRaM/simpilrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LiHRaM/simpilrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiHRaM%2Fsimpilrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiHRaM%2Fsimpilrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 95624dfc021fd95056b28a4d05cb8675404ed593
[INFO] checking LiHRaM/simpilrs against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiHRaM%2Fsimpilrs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LiHRaM/simpilrs on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LiHRaM/simpilrs
[INFO] finished tweaking git repo https://github.com/LiHRaM/simpilrs
[INFO] tweaked toml for git repo https://github.com/LiHRaM/simpilrs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/LiHRaM/simpilrs 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tracing-serde v0.1.1
[INFO] [stderr]   Downloaded tracing-core v0.1.15
[INFO] [stderr]   Downloaded argh_shared v0.1.1
[INFO] [stderr]   Downloaded argh_derive v0.1.1
[INFO] [stderr]   Downloaded argh v0.1.3
[INFO] [stderr]   Downloaded tracing v0.1.19
[INFO] [stderr]   Downloaded sharded-slab v0.0.9
[INFO] [stderr]   Downloaded chrono v0.4.15
[INFO] [stderr]   Downloaded tracing-subscriber v0.2.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4ba062b851746a385260a7fb1f56ad0087eeb68e5799c8ff3602e56f2569c85b
[INFO] running `Command { std: "docker" "start" "-a" "4ba062b851746a385260a7fb1f56ad0087eeb68e5799c8ff3602e56f2569c85b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ba062b851746a385260a7fb1f56ad0087eeb68e5799c8ff3602e56f2569c85b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ba062b851746a385260a7fb1f56ad0087eeb68e5799c8ff3602e56f2569c85b", kill_on_drop: false }`
[INFO] [stdout] 4ba062b851746a385260a7fb1f56ad0087eeb68e5799c8ff3602e56f2569c85b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a01943e02f0753809cba0d42c9dac28cdf9ecff42a510f2c9d90df67e9fdd8a8
[INFO] running `Command { std: "docker" "start" "-a" "a01943e02f0753809cba0d42c9dac28cdf9ecff42a510f2c9d90df67e9fdd8a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]    Compiling argh_shared v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking tracing-core v0.1.15
[INFO] [stderr]     Checking sharded-slab v0.0.9
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking tracing-log v0.1.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking tracing-serde v0.1.1
[INFO] [stderr]     Checking tracing-subscriber v0.2.11
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling argh_derive v0.1.1
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]     Checking argh v0.1.3
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]     Checking simpilrs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/parser.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     iter::{Iterator, Peekable},
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/parser.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     iter::{Iterator, Peekable},
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Scanner` is imported redundantly
[INFO] [stdout]    --> src/parser.rs:301:9
[INFO] [stdout]     |
[INFO] [stdout] 300 |     use super::*;
[INFO] [stdout]     |         -------- the item `Scanner` is already imported here
[INFO] [stdout] 301 |     use crate::scanner::Scanner;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Program` is never constructed
[INFO] [stdout]  --> src/syntax.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Program {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Program` is never constructed
[INFO] [stdout]  --> src/syntax.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Program {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.27s
[INFO] running `Command { std: "docker" "inspect" "a01943e02f0753809cba0d42c9dac28cdf9ecff42a510f2c9d90df67e9fdd8a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a01943e02f0753809cba0d42c9dac28cdf9ecff42a510f2c9d90df67e9fdd8a8", kill_on_drop: false }`
[INFO] [stdout] a01943e02f0753809cba0d42c9dac28cdf9ecff42a510f2c9d90df67e9fdd8a8
[INFO] checking LiHRaM/simpilrs against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiHRaM%2Fsimpilrs" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LiHRaM/simpilrs on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LiHRaM/simpilrs
[INFO] finished tweaking git repo https://github.com/LiHRaM/simpilrs
[INFO] tweaked toml for git repo https://github.com/LiHRaM/simpilrs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/LiHRaM/simpilrs 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 35f2ad93c9eb89ca8d63fac05cd5787ca4d26e2b55a0fa1a196dd5b8d148d608
[INFO] running `Command { std: "docker" "start" "-a" "35f2ad93c9eb89ca8d63fac05cd5787ca4d26e2b55a0fa1a196dd5b8d148d608", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35f2ad93c9eb89ca8d63fac05cd5787ca4d26e2b55a0fa1a196dd5b8d148d608", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35f2ad93c9eb89ca8d63fac05cd5787ca4d26e2b55a0fa1a196dd5b8d148d608", kill_on_drop: false }`
[INFO] [stdout] 35f2ad93c9eb89ca8d63fac05cd5787ca4d26e2b55a0fa1a196dd5b8d148d608
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c8ed6407382885bfcc83e27507076d1bfec0d244391b76c9aa78b9913e26240
[INFO] running `Command { std: "docker" "start" "-a" "2c8ed6407382885bfcc83e27507076d1bfec0d244391b76c9aa78b9913e26240", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling argh_shared v0.1.1
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking tracing-core v0.1.15
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking sharded-slab v0.0.9
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking tracing-log v0.1.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking tracing-serde v0.1.1
[INFO] [stderr]     Checking tracing-subscriber v0.2.11
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]    Compiling argh_derive v0.1.1
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking argh v0.1.3
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]     Checking simpilrs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/parser.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     iter::{Iterator, Peekable},
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/parser.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     iter::{Iterator, Peekable},
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Scanner` is imported redundantly
[INFO] [stdout]    --> src/parser.rs:301:9
[INFO] [stdout]     |
[INFO] [stdout] 300 |     use super::*;
[INFO] [stdout]     |         -------- the item `Scanner` is already imported here
[INFO] [stdout] 301 |     use crate::scanner::Scanner;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Program` is never constructed
[INFO] [stdout]  --> src/syntax.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Program {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Program` is never constructed
[INFO] [stdout]  --> src/syntax.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Program {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.24s
[INFO] running `Command { std: "docker" "inspect" "2c8ed6407382885bfcc83e27507076d1bfec0d244391b76c9aa78b9913e26240", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c8ed6407382885bfcc83e27507076d1bfec0d244391b76c9aa78b9913e26240", kill_on_drop: false }`
[INFO] [stdout] 2c8ed6407382885bfcc83e27507076d1bfec0d244391b76c9aa78b9913e26240