[INFO] fetching crate j4rs 0.17.1...
[INFO] checking j4rs-0.17.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate j4rs 0.17.1 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate j4rs 0.17.1 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 j4rs 0.17.1
[INFO] finished tweaking crates.io crate j4rs 0.17.1
[INFO] tweaked toml for crates.io crate j4rs 0.17.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 183 packages
[INFO] [stderr]       Adding anes v0.1.6 (latest: v0.2.0)
[INFO] [stderr]       Adding async-channel v1.9.0 (latest: v2.2.0)
[INFO] [stderr]       Adding async-io v1.13.0 (latest: v2.3.2)
[INFO] [stderr]       Adding async-lock v2.8.0 (latest: v3.3.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding event-listener v2.5.3 (latest: v5.3.0)
[INFO] [stderr]       Adding event-listener v4.0.3 (latest: v5.3.0)
[INFO] [stderr]       Adding event-listener-strategy v0.4.0 (latest: v0.5.1)
[INFO] [stderr]       Adding fastrand v1.9.0 (latest: v2.0.2)
[INFO] [stderr]       Adding futures-lite v1.13.0 (latest: v2.3.0)
[INFO] [stderr]       Adding generic-array v0.14.7 (latest: v1.0.0)
[INFO] [stderr]       Adding gloo-timers v0.2.6 (latest: v0.3.0)
[INFO] [stderr]       Adding io-lifetimes v1.0.11 (latest: v2.0.3)
[INFO] [stderr]       Adding itertools v0.10.5 (latest: v0.12.1)
[INFO] [stderr]       Adding jni-sys v0.3.0 (latest: v0.4.0)
[INFO] [stderr]       Adding linux-raw-sys v0.3.8 (latest: v0.6.4)
[INFO] [stderr]       Adding linux-raw-sys v0.4.13 (latest: v0.6.4)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding polling v2.8.0 (latest: v3.6.0)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding rustix v0.37.27 (latest: v0.38.32)
[INFO] [stderr]       Adding socket2 v0.4.10 (latest: v0.5.6)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[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 java-locator v0.1.5
[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] 9d9dede30af807182cb27ce87a7b8445a74bf2353668de9d2b9c3c56586e01d8
[INFO] running `Command { std: "docker" "start" "-a" "9d9dede30af807182cb27ce87a7b8445a74bf2353668de9d2b9c3c56586e01d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d9dede30af807182cb27ce87a7b8445a74bf2353668de9d2b9c3c56586e01d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d9dede30af807182cb27ce87a7b8445a74bf2353668de9d2b9c3c56586e01d8", kill_on_drop: false }`
[INFO] [stdout] 9d9dede30af807182cb27ce87a7b8445a74bf2353668de9d2b9c3c56586e01d8
[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] 91d42949d944179c452e0367d5b5b628a3fb8be04552a1f38af3a64e1780e706
[INFO] running `Command { std: "docker" "start" "-a" "91d42949d944179c452e0367d5b5b628a3fb8be04552a1f38af3a64e1780e706", kill_on_drop: false }`
[INFO] [stderr]     Checking parking v2.2.0
[INFO] [stderr]     Checking futures-io v0.3.30
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]     Checking concurrent-queue v2.4.0
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking fastrand v2.0.2
[INFO] [stderr]    Compiling rustix v0.38.32
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking value-bag v1.8.1
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]     Checking event-listener v4.0.3
[INFO] [stderr]     Checking futures-lite v2.3.0
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking event-listener v5.3.0
[INFO] [stderr]     Checking linux-raw-sys v0.4.13
[INFO] [stderr]     Checking event-listener-strategy v0.4.0
[INFO] [stderr]    Compiling option-ext v0.2.0
[INFO] [stderr]     Checking async-lock v3.3.0
[INFO] [stderr]    Compiling dirs-sys v0.4.1
[INFO] [stderr]     Checking event-listener-strategy v0.5.1
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling polling v2.8.0
[INFO] [stderr]    Compiling glob v0.3.1
[INFO] [stderr]     Checking async-task v4.7.0
[INFO] [stderr]    Compiling cpufeatures v0.2.12
[INFO] [stderr]    Compiling rustix v0.37.27
[INFO] [stderr]     Checking atomic-waker v1.1.2
[INFO] [stderr]    Compiling java-locator v0.1.5
[INFO] [stderr]     Checking piper v0.2.1
[INFO] [stderr]     Checking async-channel v2.2.0
[INFO] [stderr]    Compiling dirs v5.0.1
[INFO] [stderr]    Compiling async-io v1.13.0
[INFO] [stderr]     Checking anstyle v1.0.6
[INFO] [stderr]     Checking clap_lex v0.7.0
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]    Compiling fs_extra v1.3.0
[INFO] [stderr]     Checking waker-fn v1.1.1
[INFO] [stderr]     Checking clap_builder v4.5.2
[INFO] [stderr]     Checking futures-lite v1.13.0
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking blocking v1.5.1
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling sha2 v0.10.8
[INFO] [stderr]     Checking async-executor v1.9.1
[INFO] [stderr]     Checking async-lock v2.8.0
[INFO] [stderr]     Checking socket2 v0.4.10
[INFO] [stderr]    Compiling j4rs v0.17.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling async-attributes v1.1.2
[INFO] [stdout] warning: the item `java_locator` is imported redundantly
[INFO] [stdout]   --> build.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use java_locator;
[INFO] [stdout]    |     ^^^^^^^^^^^^ the item `java_locator` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking clap v4.5.4
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking libloading v0.8.3
[INFO] [stderr]     Checking dunce v1.0.4
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking ciborium v0.2.2
[INFO] [stderr]     Checking cesu8 v1.1.0
[INFO] [stderr]     Checking jni-sys v0.3.0
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.5.1
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | use std::convert::TryFrom;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Drop` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use std::ops::Drop;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Drop` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `jni_sys` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     self,
[INFO] [stdout]    |     ^^^^ the item `jni_sys` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/api/invocation_arg.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::convert::TryFrom;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/api/invocation_arg.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/api/instance.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::convert::TryFrom;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libloading` is imported redundantly
[INFO] [stdout]   --> src/api_tweaks/generic.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use libloading;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `libloading` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `fs_extra` is imported redundantly
[INFO] [stdout]   --> src/errors.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use fs_extra;
[INFO] [stdout]    |     ^^^^^^^^ the item `fs_extra` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/errors.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]   --> src/utils.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::{self, env, fs, str};
[INFO] [stdout]    |           ^^^^ the item `std` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/utils.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | use libc::{self, c_char};
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | extern crate libc;
[INFO] [stdout]    | ------------------ the item `libc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `jni_sys` is imported redundantly
[INFO] [stdout]   --> src/cache.rs:19:15
[INFO] [stdout]    |
[INFO] [stdout] 19 | use jni_sys::{self, jboolean, jbyte, jclass, jdouble, jfloat, jint, jlong, jmethodID, JNIEnv, jobject, jobjectArray, jshort, jsize, jstri...
[INFO] [stdout]    |               ^^^^ the item `jni_sys` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/jfx.rs:15:20
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::convert::{TryFrom, TryInto};
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryInto` is imported redundantly
[INFO] [stdout]   --> src/jfx.rs:15:29
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::convert::{TryFrom, TryInto};
[INFO] [stdout]    |                             ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryInto` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking polling v3.6.0
[INFO] [stderr]     Checking async-io v2.3.2
[INFO] [stderr]     Checking async-global-executor v2.4.1
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking async-std v1.12.0
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> benches/j4rs_benchmark.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `TryFrom` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `j4rs` is imported redundantly
[INFO] [stdout]  --> benches/j4rs_benchmark.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | use j4rs::{self, Instance, InvocationArg, Jvm};
[INFO] [stdout]   |            ^^^^ the item `j4rs` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_instance_creation` is never used
[INFO] [stdout]   --> benches/j4rs_benchmark.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn do_instance_creation(jvm: &Jvm) -> Instance {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_invocation_w_no_args` is never used
[INFO] [stdout]   --> benches/j4rs_benchmark.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn do_invocation_w_no_args(jvm: &Jvm, instance: &Instance) -> Instance {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_invocation_w_string_args` is never used
[INFO] [stdout]   --> benches/j4rs_benchmark.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn do_invocation_w_string_args(jvm: &Jvm, instance: &Instance) -> Instance {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_invocation_w_integer_args` is never used
[INFO] [stdout]   --> benches/j4rs_benchmark.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn do_invocation_w_integer_args(jvm: &Jvm, instance: &Instance) -> Instance {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_invocation_w_string_args_and_to_rust` is never used
[INFO] [stdout]   --> benches/j4rs_benchmark.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn do_invocation_w_string_args_and_to_rust(jvm: &Jvm, instance: &Instance) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `j4rs_benchmark` is never used
[INFO] [stdout]   --> benches/j4rs_benchmark.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn j4rs_benchmark(c: &mut Criterion) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | use std::convert::TryFrom;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Drop` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use std::ops::Drop;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Drop` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `jni_sys` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     self,
[INFO] [stdout]    |     ^^^^ the item `jni_sys` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/api/mod.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/api/invocation_arg.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::convert::TryFrom;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/api/invocation_arg.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/api/instance.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::convert::TryFrom;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio` is imported redundantly
[INFO] [stdout]    --> src/async_api/mod.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     use tokio;
[INFO] [stdout]     |         ^^^^^ the item `tokio` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libloading` is imported redundantly
[INFO] [stdout]   --> src/api_tweaks/generic.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use libloading;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `libloading` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `fs_extra` is imported redundantly
[INFO] [stdout]   --> src/errors.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use fs_extra;
[INFO] [stdout]    |     ^^^^^^^^ the item `fs_extra` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/errors.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/utils.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | use libc::{self, c_char};
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | extern crate libc;
[INFO] [stdout]    | ------------------ the item `libc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]    --> src/utils.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |     use std::convert::TryFrom;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `jni_sys` is imported redundantly
[INFO] [stdout]   --> src/cache.rs:19:15
[INFO] [stdout]    |
[INFO] [stdout] 19 | use jni_sys::{self, jboolean, jbyte, jclass, jdouble, jfloat, jint, jlong, jmethodID, JNIEnv, jobject, jobjectArray, jshort, jsize, jstri...
[INFO] [stdout]    |               ^^^^ the item `jni_sys` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]   --> src/jfx.rs:15:20
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::convert::{TryFrom, TryInto};
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryInto` is imported redundantly
[INFO] [stdout]   --> src/jfx.rs:15:29
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::convert::{TryFrom, TryInto};
[INFO] [stdout]    |                             ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `TryInto` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |     use std::convert::TryFrom;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 33.64s
[INFO] running `Command { std: "docker" "inspect" "91d42949d944179c452e0367d5b5b628a3fb8be04552a1f38af3a64e1780e706", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91d42949d944179c452e0367d5b5b628a3fb8be04552a1f38af3a64e1780e706", kill_on_drop: false }`
[INFO] [stdout] 91d42949d944179c452e0367d5b5b628a3fb8be04552a1f38af3a64e1780e706