[INFO] fetching crate graviton 0.6.0...
[INFO] checking graviton-0.6.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate graviton 0.6.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate graviton 0.6.0 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 crates.io crate graviton 0.6.0
[INFO] finished tweaking crates.io crate graviton 0.6.0
[INFO] tweaked toml for crates.io crate graviton 0.6.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate graviton 0.6.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rmp-serde v0.14.0
[INFO] [stderr]   Downloaded rmp v0.8.9
[INFO] [stderr]   Downloaded colored v1.9.2
[INFO] [stderr]   Downloaded graviton_frontend v0.6.0
[INFO] [stderr]   Downloaded scroll_derive v0.10.1
[INFO] [stderr]   Downloaded thiserror v1.0.9
[INFO] [stderr]   Downloaded graviton_backend v0.6.0
[INFO] [stderr]   Downloaded indexmap v1.3.1
[INFO] [stderr]   Downloaded goblin v0.1.3
[INFO] [stderr]   Downloaded string-interner v0.7.1
[INFO] [stderr]   Downloaded faerie v0.14.0
[INFO] [stderr]   Downloaded cranelift-faerie v0.56.0
[INFO] [stderr]   Downloaded smallvec v1.1.0
[INFO] [stderr]   Downloaded erased-serde v0.3.10
[INFO] [stderr]   Downloaded thiserror-impl v1.0.9
[INFO] [stderr]   Downloaded typetag-impl v0.1.4
[INFO] [stderr]   Downloaded typetag v0.1.4
[INFO] [stderr]   Downloaded graviton_core v0.6.0
[INFO] [stderr]   Downloaded graviton_ast v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 562969fd0002cb631a52fc6b90d54f7495c69b62ce53004c0eef5a0d879fbc2f
[INFO] running `Command { std: "docker" "start" "-a" "562969fd0002cb631a52fc6b90d54f7495c69b62ce53004c0eef5a0d879fbc2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "562969fd0002cb631a52fc6b90d54f7495c69b62ce53004c0eef5a0d879fbc2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "562969fd0002cb631a52fc6b90d54f7495c69b62ce53004c0eef5a0d879fbc2f", kill_on_drop: false }`
[INFO] [stdout] 562969fd0002cb631a52fc6b90d54f7495c69b62ce53004c0eef5a0d879fbc2f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 6840a418d9d332bf4de167f7771d9b6fe4e632c801a424210fb95b6cbe15dba7
[INFO] running `Command { std: "docker" "start" "-a" "6840a418d9d332bf4de167f7771d9b6fe4e632c801a424210fb95b6cbe15dba7", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling cranelift-entity v0.56.0
[INFO] [stderr]    Compiling target-lexicon v0.10.0
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.56.0
[INFO] [stderr]     Checking smallvec v1.1.0
[INFO] [stderr]    Compiling indexmap v1.3.1
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling anyhow v1.0.26
[INFO] [stderr]     Checking plain v0.2.3
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking colored v1.9.2
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking downcast-rs v1.1.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking cranelift-bforest v0.56.0
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.56.0
[INFO] [stderr]     Checking rmp v0.8.9
[INFO] [stderr]    Compiling raw-cpuid v7.0.3
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling thiserror-impl v1.0.9
[INFO] [stderr]    Compiling scroll_derive v0.10.1
[INFO] [stderr]    Compiling ghost v0.1.1
[INFO] [stderr]    Compiling inventory-impl v0.1.5
[INFO] [stderr]    Compiling ctor v0.1.12
[INFO] [stderr]    Compiling typetag-impl v0.1.4
[INFO] [stderr]     Checking scroll v0.10.1
[INFO] [stderr]     Checking thiserror v1.0.9
[INFO] [stderr]    Compiling cranelift-codegen v0.56.0
[INFO] [stderr]     Checking goblin v0.1.3
[INFO] [stderr]     Checking inventory v0.1.5
[INFO] [stderr]     Checking graviton_core v0.6.0
[INFO] [stderr]     Checking string-interner v0.7.1
[INFO] [stderr]     Checking erased-serde v0.3.10
[INFO] [stderr]     Checking rmp-serde v0.14.0
[INFO] [stderr]     Checking faerie v0.14.0
[INFO] [stderr]     Checking graviton_ast v0.6.0
[INFO] [stderr]     Checking typetag v0.1.4
[INFO] [stderr]     Checking cranelift-module v0.56.0
[INFO] [stderr]     Checking cranelift-frontend v0.56.0
[INFO] [stderr]     Checking cranelift-native v0.56.0
[INFO] [stderr]     Checking cranelift-faerie v0.56.0
[INFO] [stderr]     Checking cranelift v0.56.0
[INFO] [stderr]     Checking graviton_frontend v0.6.0
[INFO] [stderr]     Checking graviton_backend v0.6.0
[INFO] [stderr]     Checking graviton v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/repl.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `Write` is already imported here
[INFO] [stdout] 2 | use std::io::{BufRead, Write};
[INFO] [stdout]   |                        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/repl.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `Write` is already imported here
[INFO] [stdout] 2 | use std::io::{BufRead, Write};
[INFO] [stdout]   |                        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` 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 18.81s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: cranelift-codegen-meta v0.56.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "6840a418d9d332bf4de167f7771d9b6fe4e632c801a424210fb95b6cbe15dba7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6840a418d9d332bf4de167f7771d9b6fe4e632c801a424210fb95b6cbe15dba7", kill_on_drop: false }`
[INFO] [stdout] 6840a418d9d332bf4de167f7771d9b6fe4e632c801a424210fb95b6cbe15dba7