[INFO] fetching crate nature_integrate_test_executor 0.15.0...
[INFO] checking nature_integrate_test_executor-0.15.0 against master#af3c6e733a40e671550e0f0f5aeecaa13772ba56 for pr-74989
[INFO] extracting crate nature_integrate_test_executor 0.15.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate nature_integrate_test_executor 0.15.0 on toolchain af3c6e733a40e671550e0f0f5aeecaa13772ba56
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nature_integrate_test_executor 0.15.0
[INFO] finished tweaking crates.io crate nature_integrate_test_executor 0.15.0
[INFO] tweaked toml for crates.io crate nature_integrate_test_executor 0.15.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6b5aa9fb2e961ca58fc98468014948926a4a5af2f09a5e754bb2cbbe7320c77b
[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" "6b5aa9fb2e961ca58fc98468014948926a4a5af2f09a5e754bb2cbbe7320c77b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b5aa9fb2e961ca58fc98468014948926a4a5af2f09a5e754bb2cbbe7320c77b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b5aa9fb2e961ca58fc98468014948926a4a5af2f09a5e754bb2cbbe7320c77b", kill_on_drop: false }`
[INFO] [stdout] 6b5aa9fb2e961ca58fc98468014948926a4a5af2f09a5e754bb2cbbe7320c77b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85cf495e3a12ebd9c6f5389aab25d642e5dad7a824970136376e25e13d85ea60
[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" "85cf495e3a12ebd9c6f5389aab25d642e5dad7a824970136376e25e13d85ea60", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]     Checking arc-swap v0.4.7
[INFO] [stderr]     Checking pin-project-lite v0.1.7
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling cc v1.0.59
[INFO] [stderr]    Compiling pkg-config v0.3.18
[INFO] [stderr]     Checking instant v0.1.6
[INFO] [stderr]     Checking adler v0.2.3
[INFO] [stderr]     Checking gimli v0.22.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking ppv-lite86 v0.2.9
[INFO] [stderr]     Checking object v0.20.0
[INFO] [stderr]     Checking linked-hash-map v0.5.3
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking tower-service v0.3.0
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking base64 v0.11.0
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]     Checking tracing-core v0.1.16
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]     Checking lock_api v0.4.1
[INFO] [stderr]     Checking miniz_oxide v0.4.1
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking lru-cache v0.1.2
[INFO] [stderr]     Checking encoding_rs v0.8.24
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking socket2 v0.3.15
[INFO] [stderr]     Checking parking_lot_core v0.8.0
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking hostname v0.3.1
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling syn v1.0.40
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking fern v0.6.0
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking resolv-conf v0.6.3
[INFO] [stderr]     Checking parking_lot v0.11.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking addr2line v0.13.0
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking actix-codec v0.2.0
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling derive_more v0.99.10
[INFO] [stderr]    Compiling enum-as-inner v0.3.3
[INFO] [stderr]    Compiling async-trait v0.1.40
[INFO] [stderr]    Compiling actix-macros v0.1.2
[INFO] [stderr]    Compiling actix_derive v0.5.0
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking actix-threadpool v0.3.3
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]     Checking actix-service v1.0.6
[INFO] [stderr]     Checking actix-rt v1.1.1
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking trust-dns-proto v0.18.0-alpha.2
[INFO] [stderr]     Checking actix-utils v1.0.6
[INFO] [stderr]     Checking trust-dns-resolver v0.18.0-alpha.2
[INFO] [stderr]     Checking actix-connect v1.0.2
[INFO] [stderr]     Checking hyper v0.13.7
[INFO] [stderr]     Checking actix-http v1.0.1
[INFO] [stderr]     Checking actix v0.9.0
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]     Checking reqwest v0.10.8
[INFO] [stderr]     Checking nature_common v0.15.0
[INFO] [stderr]     Checking nature_integrate_test_executor v0.15.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]  --> src/lib.rs:8:55
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub extern fn rtn_none(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]   |                                                       ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]   = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]   = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:15:64
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub extern fn rtn_logical_error(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                                ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:22:54
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub extern fn rtn_one(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:31:54
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub extern fn rtn_tow(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:42:68
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub extern fn rtn_environment_error(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                                    ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]  --> src/lib.rs:8:55
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub extern fn rtn_none(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]   |                                                       ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]   = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]   = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:15:64
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub extern fn rtn_logical_error(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                                ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:22:54
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub extern fn rtn_one(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<nature_common::Instance, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:49:54
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub extern fn filter_before_test(para: &Instance) -> Result<Instance> {
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<Vec<nature_common::Instance>, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:58:58
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub extern fn filter_after_test(para: &Vec<Instance>) -> Result<Vec<Instance>> {
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::Instance`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:70:32
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub extern fn append_star(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                ^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]    = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:31:54
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub extern fn rtn_tow(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<nature_common::Instance, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:70:45
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub extern fn append_star(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::Instance`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:80:32
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub extern fn append_plus(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                ^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]    = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<nature_common::Instance, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:80:45
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub extern fn append_plus(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::ConverterReturned`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:42:68
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub extern fn rtn_environment_error(_para: &ConverterParameter) -> ConverterReturned {
[INFO] [stdout]    |                                                                    ^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<nature_common::Instance, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:49:54
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub extern fn filter_before_test(para: &Instance) -> Result<Instance> {
[INFO] [stdout]    |                                                      ^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<Vec<nature_common::Instance>, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:58:58
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub extern fn filter_after_test(para: &Vec<Instance>) -> Result<Vec<Instance>> {
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::Instance`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:70:32
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub extern fn append_star(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                ^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]    = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<nature_common::Instance, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:70:45
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub extern fn append_star(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `nature_common::Instance`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:80:32
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub extern fn append_plus(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                ^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]    = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<nature_common::Instance, NatureError>`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:80:45
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub extern fn append_plus(ins: Instance) -> Result<Instance> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 56s
[INFO] running `Command { std: "docker" "inspect" "85cf495e3a12ebd9c6f5389aab25d642e5dad7a824970136376e25e13d85ea60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85cf495e3a12ebd9c6f5389aab25d642e5dad7a824970136376e25e13d85ea60", kill_on_drop: false }`
[INFO] [stdout] 85cf495e3a12ebd9c6f5389aab25d642e5dad7a824970136376e25e13d85ea60
