[INFO] crate asn1_der 0.7.1 is already in cache
[INFO] testing asn1_der-0.7.1 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate asn1_der 0.7.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate asn1_der 0.7.1 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate asn1_der 0.7.1
[INFO] finished tweaking crates.io crate asn1_der 0.7.1
[INFO] tweaked toml for crates.io crate asn1_der 0.7.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1ab03320167940bc831225c824549a2eff92bb5ca8f64a612528fc6a8f014a6f
[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" "1ab03320167940bc831225c824549a2eff92bb5ca8f64a612528fc6a8f014a6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ab03320167940bc831225c824549a2eff92bb5ca8f64a612528fc6a8f014a6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ab03320167940bc831225c824549a2eff92bb5ca8f64a612528fc6a8f014a6f", kill_on_drop: false }`
[INFO] [stdout] 1ab03320167940bc831225c824549a2eff92bb5ca8f64a612528fc6a8f014a6f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6adb7a2d7d87b9465adbf2a356c2f6b40fbe057cceec1e049ff83621331068a
[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" "a6adb7a2d7d87b9465adbf2a356c2f6b40fbe057cceec1e049ff83621331068a", kill_on_drop: false }`
[INFO] [stderr]    Compiling asn1_der v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:47
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stdout]    |                                                  ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:59
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stdout]    |                                                              ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:68
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[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<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stdout]    --> src/error.rs:153:36
[INFO] [stdout]     |
[INFO] [stdout] 153 |         source: &Option<ErrorSource>) -> fmt::Result
[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 `[u8]`, which is not FFI-safe
[INFO] [stdout]   --> src/typed/utf8_string.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 |     extern "C" fn is_utf8(slice: &[u8]) -> bool {
[INFO] [stdout]    |                                  ^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a raw pointer instead
[INFO] [stdout]    = note: slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `Command { std: "docker" "inspect" "a6adb7a2d7d87b9465adbf2a356c2f6b40fbe057cceec1e049ff83621331068a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6adb7a2d7d87b9465adbf2a356c2f6b40fbe057cceec1e049ff83621331068a", kill_on_drop: false }`
[INFO] [stdout] a6adb7a2d7d87b9465adbf2a356c2f6b40fbe057cceec1e049ff83621331068a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6d7d1a1f6fbce62e58d828e5d10038600afb92625efd07a8d143a079d2ea718
[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" "a6d7d1a1f6fbce62e58d828e5d10038600afb92625efd07a8d143a079d2ea718", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.37
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:47
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stdout]    |                                                  ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:59
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stdout]    |                                                              ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:68
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[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<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stdout]    --> src/error.rs:153:36
[INFO] [stdout]     |
[INFO] [stdout] 153 |         source: &Option<ErrorSource>) -> fmt::Result
[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 `[u8]`, which is not FFI-safe
[INFO] [stdout]   --> src/typed/utf8_string.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 |     extern "C" fn is_utf8(slice: &[u8]) -> bool {
[INFO] [stdout]    |                                  ^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a raw pointer instead
[INFO] [stdout]    = note: slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling asn1_der v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]    --> src/error.rs:95:47
[INFO] [stdout]     |
[INFO] [stdout] 95  |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stdout]     |                                                  ^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:121:26
[INFO] [stdout]     |
[INFO] [stdout] 121 | #![cfg_attr(test, forbid(warnings))]
[INFO] [stdout]     |                          ^^^^^^^^
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` implied by `#[warn(warnings)]`
[INFO] [stdout]     = help: consider using `*const u8` and a length instead
[INFO] [stdout]     = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:59
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stdout]    |                                                              ^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using `*const u8` and a length instead
[INFO] [stdout]    = note: string slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stdout]   --> src/error.rs:95:68
[INFO] [stdout]    |
[INFO] [stdout] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[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<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stdout]    --> src/error.rs:153:36
[INFO] [stdout]     |
[INFO] [stdout] 153 |         source: &Option<ErrorSource>) -> fmt::Result
[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 `[u8]`, which is not FFI-safe
[INFO] [stdout]   --> src/typed/utf8_string.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 |     extern "C" fn is_utf8(slice: &[u8]) -> bool {
[INFO] [stdout]    |                                  ^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a raw pointer instead
[INFO] [stdout]    = note: slices have no C equivalent
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 41.01s
[INFO] running `Command { std: "docker" "inspect" "a6d7d1a1f6fbce62e58d828e5d10038600afb92625efd07a8d143a079d2ea718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6d7d1a1f6fbce62e58d828e5d10038600afb92625efd07a8d143a079d2ea718", kill_on_drop: false }`
[INFO] [stdout] a6d7d1a1f6fbce62e58d828e5d10038600afb92625efd07a8d143a079d2ea718
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen", 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] c01e0ee8861313f7502b7919169ca027fd38c3903cac7dca0373cedda4f0dc22
[INFO] running `Command { std: "docker" "start" "-a" "c01e0ee8861313f7502b7919169ca027fd38c3903cac7dca0373cedda4f0dc22", kill_on_drop: false }`
[INFO] [stderr] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stderr]   --> src/error.rs:95:47
[INFO] [stderr]    |
[INFO] [stderr] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stderr]    |                                                  ^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stderr]    = help: consider using `*const u8` and a length instead
[INFO] [stderr]    = note: string slices have no C equivalent
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stderr]   --> src/error.rs:95:59
[INFO] [stderr]    |
[INFO] [stderr] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stderr]    |                                                              ^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider using `*const u8` and a length instead
[INFO] [stderr]    = note: string slices have no C equivalent
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stderr]   --> src/error.rs:95:68
[INFO] [stderr]    |
[INFO] [stderr] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stderr]    |                                                                       ^^^^^^^^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stderr]    = note: enum has no representation hint
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stderr]    --> src/error.rs:153:36
[INFO] [stderr]     |
[INFO] [stderr] 153 |         source: &Option<ErrorSource>) -> fmt::Result
[INFO] [stderr]     |                                          ^^^^^^^^^^^ not FFI-safe
[INFO] [stderr]     |
[INFO] [stderr]     = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stderr]     = note: enum has no representation hint
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `[u8]`, which is not FFI-safe
[INFO] [stderr]   --> src/typed/utf8_string.rs:46:31
[INFO] [stderr]    |
[INFO] [stderr] 46 |     extern "C" fn is_utf8(slice: &[u8]) -> bool {
[INFO] [stderr]    |                                  ^^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider using a raw pointer instead
[INFO] [stderr]    = note: slices have no C equivalent
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stderr]    --> src/error.rs:95:47
[INFO] [stderr]     |
[INFO] [stderr] 95  |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stderr]     |                                                  ^^^^ not FFI-safe
[INFO] [stderr]     |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]    --> src/lib.rs:121:26
[INFO] [stderr]     |
[INFO] [stderr] 121 | #![cfg_attr(test, forbid(warnings))]
[INFO] [stderr]     |                          ^^^^^^^^
[INFO] [stderr]     = note: `#[warn(improper_ctypes_definitions)]` implied by `#[warn(warnings)]`
[INFO] [stderr]     = help: consider using `*const u8` and a length instead
[INFO] [stderr]     = note: string slices have no C equivalent
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `str`, which is not FFI-safe
[INFO] [stderr]   --> src/error.rs:95:59
[INFO] [stderr]    |
[INFO] [stderr] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stderr]    |                                                              ^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider using `*const u8` and a length instead
[INFO] [stderr]    = note: string slices have no C equivalent
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stderr]   --> src/error.rs:95:68
[INFO] [stderr]    |
[INFO] [stderr] 95 |     extern "C" fn write(f: &mut Formatter, kind: &str, desc: &str) -> fmt::Result {
[INFO] [stderr]    |                                                                       ^^^^^^^^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stderr]    = note: enum has no representation hint
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `std::result::Result<(), std::fmt::Error>`, which is not FFI-safe
[INFO] [stderr]    --> src/error.rs:153:36
[INFO] [stderr]     |
[INFO] [stderr] 153 |         source: &Option<ErrorSource>) -> fmt::Result
[INFO] [stderr]     |                                          ^^^^^^^^^^^ not FFI-safe
[INFO] [stderr]     |
[INFO] [stderr]     = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stderr]     = note: enum has no representation hint
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` fn uses type `[u8]`, which is not FFI-safe
[INFO] [stderr]   --> src/typed/utf8_string.rs:46:31
[INFO] [stderr]    |
[INFO] [stderr] 46 |     extern "C" fn is_utf8(slice: &[u8]) -> bool {
[INFO] [stderr]    |                                  ^^^^^ not FFI-safe
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider using a raw pointer instead
[INFO] [stderr]    = note: slices have no C equivalent
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/asn1_der-09e8ba9dd68fa9af
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/err-06ac4456f9e626cc
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test length ... ok
[INFO] [stdout] test object ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/err_typed-0d8814418f8d41bd
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test integer ... ok
[INFO] [stdout] test sequence ... ok
[INFO] [stdout] test null ... ok
[INFO] [stdout] test octet_string ... ok
[INFO] [stdout] test boolean ... ok
[INFO] [stdout] test utf8_string ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ok-7d107877fa252104
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test object ... ok
[INFO] [stdout] test length ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ok_typed-3381fc847aca0cb0
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test null ... ok
[INFO] [stdout] test integer ... ok
[INFO] [stdout] test sequence ... ok
[INFO] [stdout] test octet_string ... ok
[INFO] [stdout] test boolean ... ok
[INFO] [stdout] test utf8_string ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests asn1_der
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 21) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c01e0ee8861313f7502b7919169ca027fd38c3903cac7dca0373cedda4f0dc22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c01e0ee8861313f7502b7919169ca027fd38c3903cac7dca0373cedda4f0dc22", kill_on_drop: false }`
[INFO] [stdout] c01e0ee8861313f7502b7919169ca027fd38c3903cac7dca0373cedda4f0dc22