[INFO] fetching crate floaout 0.2.2...
[INFO] checking floaout-0.2.2 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate floaout 0.2.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate floaout 0.2.2 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 floaout 0.2.2
[INFO] finished tweaking crates.io crate floaout 0.2.2
[INFO] tweaked toml for crates.io crate floaout 0.2.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--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]      Locking 8 packages
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[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 mycrc v0.3.1
[INFO] [stderr]   Downloaded mpl-macro v0.1.2
[INFO] [stderr]   Downloaded mpl v0.2.0
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 740eea3a1cd60759d45d1e06e40076bf3b30cf8a18a4fe7c9b56a6cbb63e1ca6
[INFO] running `Command { std: "docker" "start" "-a" "740eea3a1cd60759d45d1e06e40076bf3b30cf8a18a4fe7c9b56a6cbb63e1ca6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "740eea3a1cd60759d45d1e06e40076bf3b30cf8a18a4fe7c9b56a6cbb63e1ca6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "740eea3a1cd60759d45d1e06e40076bf3b30cf8a18a4fe7c9b56a6cbb63e1ca6", kill_on_drop: false }`
[INFO] [stdout] 740eea3a1cd60759d45d1e06e40076bf3b30cf8a18a4fe7c9b56a6cbb63e1ca6
[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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9fa2c38d7b2cfca651fcecb8fe036413fd14395da7d4bbc2f3276a66917fe56
[INFO] running `Command { std: "docker" "start" "-a" "f9fa2c38d7b2cfca651fcecb8fe036413fd14395da7d4bbc2f3276a66917fe56", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling mpl v0.2.0
[INFO] [stderr]     Checking mycrc v0.3.1
[INFO] [stderr]    Compiling mpl-macro v0.1.2
[INFO] [stderr]     Checking floaout v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BubSampleKind` is imported redundantly
[INFO] [stdout]    --> src/bub/io/frame_reader.rs:270:22
[INFO] [stdout]     |
[INFO] [stdout] 269 |     use super::*;
[INFO] [stdout]     |         -------- the item `BubSampleKind` is already imported here
[INFO] [stdout] 270 |     use crate::bub::{BubSampleKind, BubState::*};
[INFO] [stdout]     |                      ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Result` is imported redundantly
[INFO] [stdout]    --> src/wav/metadata.rs:241:9
[INFO] [stdout]     |
[INFO] [stdout] 240 |     use super::*;
[INFO] [stdout]     |         -------- the item `Result` is already imported here
[INFO] [stdout] 241 |     use std::io::Result;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.31s
[INFO] running `Command { std: "docker" "inspect" "f9fa2c38d7b2cfca651fcecb8fe036413fd14395da7d4bbc2f3276a66917fe56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9fa2c38d7b2cfca651fcecb8fe036413fd14395da7d4bbc2f3276a66917fe56", kill_on_drop: false }`
[INFO] [stdout] f9fa2c38d7b2cfca651fcecb8fe036413fd14395da7d4bbc2f3276a66917fe56
[INFO] checking floaout-0.2.2 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate floaout 0.2.2 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate floaout 0.2.2 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate floaout 0.2.2
[INFO] finished tweaking crates.io crate floaout 0.2.2
[INFO] tweaked toml for crates.io crate floaout 0.2.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed279d33acd89dda1dd32191b6455f4fa116f98786feac7d45c2101025ef7fe7
[INFO] running `Command { std: "docker" "start" "-a" "ed279d33acd89dda1dd32191b6455f4fa116f98786feac7d45c2101025ef7fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed279d33acd89dda1dd32191b6455f4fa116f98786feac7d45c2101025ef7fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed279d33acd89dda1dd32191b6455f4fa116f98786feac7d45c2101025ef7fe7", kill_on_drop: false }`
[INFO] [stdout] ed279d33acd89dda1dd32191b6455f4fa116f98786feac7d45c2101025ef7fe7
[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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a1dcc46e42c872f077a015541e42f41c7c01398ed7dcafef9126f15adc29280d
[INFO] running `Command { std: "docker" "start" "-a" "a1dcc46e42c872f077a015541e42f41c7c01398ed7dcafef9126f15adc29280d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling mpl v0.2.0
[INFO] [stderr]     Checking mycrc v0.3.1
[INFO] [stderr]    Compiling mpl-macro v0.1.2
[INFO] [stderr]     Checking floaout v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BubSampleKind` is imported redundantly
[INFO] [stdout]    --> src/bub/io/frame_reader.rs:270:22
[INFO] [stdout]     |
[INFO] [stdout] 269 |     use super::*;
[INFO] [stdout]     |         -------- the item `BubSampleKind` is already imported here
[INFO] [stdout] 270 |     use crate::bub::{BubSampleKind, BubState::*};
[INFO] [stdout]     |                      ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Result` is imported redundantly
[INFO] [stdout]    --> src/wav/metadata.rs:241:9
[INFO] [stdout]     |
[INFO] [stdout] 240 |     use super::*;
[INFO] [stdout]     |         -------- the item `Result` is already imported here
[INFO] [stdout] 241 |     use std::io::Result;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/wav/io/reader.rs:81:17
[INFO] [stdout]    |
[INFO] [stdout] 81 |                 panic!();
[INFO] [stdout]    |                 ^^^^^^^^ cannot infer type
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `floaout` (lib test) due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a1dcc46e42c872f077a015541e42f41c7c01398ed7dcafef9126f15adc29280d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1dcc46e42c872f077a015541e42f41c7c01398ed7dcafef9126f15adc29280d", kill_on_drop: false }`
[INFO] [stdout] a1dcc46e42c872f077a015541e42f41c7c01398ed7dcafef9126f15adc29280d