[INFO] cloning repository https://github.com/EmberHext/QR-Code-Generator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EmberHext/QR-Code-Generator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmberHext%2FQR-Code-Generator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmberHext%2FQR-Code-Generator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 964ad1c48e8035e7df4bd36194db52c7c39cc8ff
[INFO] checking EmberHext/QR-Code-Generator against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmberHext%2FQR-Code-Generator" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EmberHext/QR-Code-Generator 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/EmberHext/QR-Code-Generator
[INFO] finished tweaking git repo https://github.com/EmberHext/QR-Code-Generator
[INFO] tweaked toml for git repo https://github.com/EmberHext/QR-Code-Generator written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/EmberHext/QR-Code-Generator 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 regex v1.7.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 2920292c26127e1e10351d10964e729123c721734c43d0f424e705cb323ae086
[INFO] running `Command { std: "docker" "start" "-a" "2920292c26127e1e10351d10964e729123c721734c43d0f424e705cb323ae086", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2920292c26127e1e10351d10964e729123c721734c43d0f424e705cb323ae086", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2920292c26127e1e10351d10964e729123c721734c43d0f424e705cb323ae086", kill_on_drop: false }`
[INFO] [stdout] 2920292c26127e1e10351d10964e729123c721734c43d0f424e705cb323ae086
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f368b32e480cbff07d2d6050c96cf427aa444db8f983ad2d35444cfc9e44e858
[INFO] running `Command { std: "docker" "start" "-a" "f368b32e480cbff07d2d6050c96cf427aa444db8f983ad2d35444cfc9e44e858", kill_on_drop: false }`
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]     Checking regex v1.7.3
[INFO] [stderr]     Checking qr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variants `M`, `Q`, and `H` are never constructed
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum ErrorCorrectionLevel {
[INFO] [stdout]    |      -------------------- variants in this enum
[INFO] [stdout] 25 |     L,
[INFO] [stdout] 26 |     M,
[INFO] [stdout]    |     ^
[INFO] [stdout] 27 |     Q,
[INFO] [stdout]    |     ^
[INFO] [stdout] 28 |     H,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorCorrectionLevel` has a derived impl for the trait `Clone`, 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `M`, `Q`, and `H` are never constructed
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum ErrorCorrectionLevel {
[INFO] [stdout]    |      -------------------- variants in this enum
[INFO] [stdout] 25 |     L,
[INFO] [stdout] 26 |     M,
[INFO] [stdout]    |     ^
[INFO] [stdout] 27 |     Q,
[INFO] [stdout]    |     ^
[INFO] [stdout] 28 |     H,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorCorrectionLevel` has a derived impl for the trait `Clone`, 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.83s
[INFO] running `Command { std: "docker" "inspect" "f368b32e480cbff07d2d6050c96cf427aa444db8f983ad2d35444cfc9e44e858", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f368b32e480cbff07d2d6050c96cf427aa444db8f983ad2d35444cfc9e44e858", kill_on_drop: false }`
[INFO] [stdout] f368b32e480cbff07d2d6050c96cf427aa444db8f983ad2d35444cfc9e44e858
[INFO] checking EmberHext/QR-Code-Generator against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmberHext%2FQR-Code-Generator" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EmberHext/QR-Code-Generator 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/EmberHext/QR-Code-Generator
[INFO] finished tweaking git repo https://github.com/EmberHext/QR-Code-Generator
[INFO] tweaked toml for git repo https://github.com/EmberHext/QR-Code-Generator written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/EmberHext/QR-Code-Generator 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 18aefc50169f96037630420123a0b959462e8b184f194b62f532979cadb2ad7d
[INFO] running `Command { std: "docker" "start" "-a" "18aefc50169f96037630420123a0b959462e8b184f194b62f532979cadb2ad7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18aefc50169f96037630420123a0b959462e8b184f194b62f532979cadb2ad7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18aefc50169f96037630420123a0b959462e8b184f194b62f532979cadb2ad7d", kill_on_drop: false }`
[INFO] [stdout] 18aefc50169f96037630420123a0b959462e8b184f194b62f532979cadb2ad7d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f01f0ced8cbc160405a4ec063e2c7df952a5207b92148f7f363a9bc7ae2e4a72
[INFO] running `Command { std: "docker" "start" "-a" "f01f0ced8cbc160405a4ec063e2c7df952a5207b92148f7f363a9bc7ae2e4a72", kill_on_drop: false }`
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]     Checking regex v1.7.3
[INFO] [stderr]     Checking qr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variants `M`, `Q`, and `H` are never constructed
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum ErrorCorrectionLevel {
[INFO] [stdout]    |      -------------------- variants in this enum
[INFO] [stdout] 25 |     L,
[INFO] [stdout] 26 |     M,
[INFO] [stdout]    |     ^
[INFO] [stdout] 27 |     Q,
[INFO] [stdout]    |     ^
[INFO] [stdout] 28 |     H,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorCorrectionLevel` has a derived impl for the trait `Clone`, 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: variants `M`, `Q`, and `H` are never constructed
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum ErrorCorrectionLevel {
[INFO] [stdout]    |      -------------------- variants in this enum
[INFO] [stdout] 25 |     L,
[INFO] [stdout] 26 |     M,
[INFO] [stdout]    |     ^
[INFO] [stdout] 27 |     Q,
[INFO] [stdout]    |     ^
[INFO] [stdout] 28 |     H,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorCorrectionLevel` has a derived impl for the trait `Clone`, 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.71s
[INFO] running `Command { std: "docker" "inspect" "f01f0ced8cbc160405a4ec063e2c7df952a5207b92148f7f363a9bc7ae2e4a72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f01f0ced8cbc160405a4ec063e2c7df952a5207b92148f7f363a9bc7ae2e4a72", kill_on_drop: false }`
[INFO] [stdout] f01f0ced8cbc160405a4ec063e2c7df952a5207b92148f7f363a9bc7ae2e4a72