[INFO] fetching crate wasm-reader 0.2.0...
[INFO] checking wasm-reader-0.2.0 against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015
[INFO] extracting crate wasm-reader 0.2.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate wasm-reader 0.2.0 on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate wasm-reader 0.2.0
[INFO] finished tweaking crates.io crate wasm-reader 0.2.0
[INFO] tweaked toml for crates.io crate wasm-reader 0.2.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-reader-traits v0.1.1
[INFO] [stderr]   Downloaded wasmparser v0.51.4
[INFO] [stderr]   Downloaded rand_hc v0.2.0
[INFO] [stderr]   Downloaded object v0.20.0
[INFO] [stderr]   Downloaded gimli v0.22.0
[INFO] [stderr]   Downloaded derive_utils v0.10.0
[INFO] [stderr]   Downloaded env_logger v0.7.1
[INFO] [stderr]   Downloaded glob v0.3.0
[INFO] [stderr]   Downloaded auto_enums_derive v0.7.7
[INFO] [stderr]   Downloaded adler v0.2.3
[INFO] [stderr]   Downloaded auto_enums_core v0.7.7
[INFO] [stderr]   Downloaded thread_local v1.0.1
[INFO] [stderr]   Downloaded backtrace v0.3.51
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.9
[INFO] [stderr]   Downloaded quickcheck v0.9.2
[INFO] [stderr]   Downloaded getrandom v0.1.15
[INFO] [stderr]   Downloaded derive_utils v0.9.1
[INFO] [stderr]   Downloaded quickcheck_macros v0.9.1
[INFO] [stderr]   Downloaded rand v0.7.3
[INFO] [stderr]   Downloaded synstructure v0.12.4
[INFO] [stderr]   Downloaded derive-parse v0.1.0
[INFO] [stderr]   Downloaded rand_core v0.5.1
[INFO] [stderr]   Downloaded failure_derive v0.1.8
[INFO] [stderr]   Downloaded rand_chacha v0.2.2
[INFO] [stderr]   Downloaded wasi v0.9.0+wasi-snapshot-preview1
[INFO] [stderr]   Downloaded regex v1.3.9
[INFO] [stderr]   Downloaded addr2line v0.13.0
[INFO] [stderr]   Downloaded miniz_oxide v0.4.2
[INFO] [stderr]   Downloaded derive_more v0.99.11
[INFO] [stderr]   Downloaded failure v0.1.8
[INFO] [stderr]   Downloaded aho-corasick v0.7.13
[INFO] [stderr]   Downloaded auto_enums v0.7.7
[INFO] [stderr]   Downloaded regex-syntax v0.6.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] aa839afd7373a3c260c8e273caa7a79cb6dde56180f884c6bbcf2ea497e83e74
[INFO] running `Command { std: "docker" "start" "-a" "aa839afd7373a3c260c8e273caa7a79cb6dde56180f884c6bbcf2ea497e83e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa839afd7373a3c260c8e273caa7a79cb6dde56180f884c6bbcf2ea497e83e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa839afd7373a3c260c8e273caa7a79cb6dde56180f884c6bbcf2ea497e83e74", kill_on_drop: false }`
[INFO] [stdout] aa839afd7373a3c260c8e273caa7a79cb6dde56180f884c6bbcf2ea497e83e74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e536c81b3b1c7aac69a126facdc0210128851f2b2283f158da8a0b698073cfa4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e536c81b3b1c7aac69a126facdc0210128851f2b2283f158da8a0b698073cfa4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.42
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling auto_enums_derive v0.7.7
[INFO] [stderr]     Checking frunk_core v0.3.1
[INFO] [stderr]     Checking wasmparser v0.51.4
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking backtrace v0.3.51
[INFO] [stderr]     Checking quickcheck v0.9.2
[INFO] [stderr]     Checking wasm-reader-traits v0.1.1
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling derive_utils v0.10.0
[INFO] [stderr]    Compiling derive_utils v0.9.1
[INFO] [stderr]    Compiling auto_enums_core v0.7.7
[INFO] [stderr]    Compiling derive-parse v0.1.0
[INFO] [stderr]    Compiling derive_more v0.99.11
[INFO] [stderr]    Compiling quickcheck_macros v0.9.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking auto_enums v0.7.7
[INFO] [stderr]     Checking wasm-reader v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:1:47
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type, type_alias_impl_trait, specialization)]
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:1:47
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type, type_alias_impl_trait, specialization)]
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]   --> src/vec.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn len(&self) -> u32 {
[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: associated function is never used: `len`
[INFO] [stdout]   --> src/vec.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn len(&self) -> u32 {
[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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.57s
[INFO] running `Command { std: "docker" "inspect" "e536c81b3b1c7aac69a126facdc0210128851f2b2283f158da8a0b698073cfa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e536c81b3b1c7aac69a126facdc0210128851f2b2283f158da8a0b698073cfa4", kill_on_drop: false }`
[INFO] [stdout] e536c81b3b1c7aac69a126facdc0210128851f2b2283f158da8a0b698073cfa4