[INFO] fetching crate externc-libm 0.1.0...
[INFO] checking externc-libm-0.1.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate externc-libm 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate externc-libm 0.1.0
[INFO] finished tweaking crates.io crate externc-libm 0.1.0
[INFO] tweaked toml for crates.io crate externc-libm 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate externc-libm 0.1.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "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 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 35fb98cb8ea60f9927f099231acbf85cc036241a17403b378931718fc8ef486c
[INFO] running `Command { std: "docker" "start" "-a" "35fb98cb8ea60f9927f099231acbf85cc036241a17403b378931718fc8ef486c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35fb98cb8ea60f9927f099231acbf85cc036241a17403b378931718fc8ef486c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35fb98cb8ea60f9927f099231acbf85cc036241a17403b378931718fc8ef486c", kill_on_drop: false }`
[INFO] [stdout] 35fb98cb8ea60f9927f099231acbf85cc036241a17403b378931718fc8ef486c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dae55861fd14550c6ad008ccebc164904862fa8e600dcb11703981fec24b92c9
[INFO] running `Command { std: "docker" "start" "-a" "dae55861fd14550c6ad008ccebc164904862fa8e600dcb11703981fec24b92c9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libm v0.2.15
[INFO] [stderr]     Checking externc-libm v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `(f64, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/frexp.rs:12:36
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn frexp(x: f64) -> (f64, i32) {
[INFO] [stdout]    |                                    ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/frexpf.rs:12:37
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn frexpf(x: f32) -> (f32, i32) {
[INFO] [stdout]    |                                     ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/lgamma_r.rs:12:39
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn lgamma_r(x: f64) -> (f64, i32) {
[INFO] [stdout]    |                                       ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/lgammaf_r.rs:12:40
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn lgammaf_r(x: f32) -> (f32, i32) {
[INFO] [stdout]    |                                        ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, f64)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/modf.rs:12:35
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn modf(x: f64) -> (f64, f64) {
[INFO] [stdout]    |                                   ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, f32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/modff.rs:12:36
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn modff(x: f32) -> (f32, f32) {
[INFO] [stdout]    |                                    ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/remquo.rs:12:45
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn remquo(x: f64, y: f64) -> (f64, i32) {
[INFO] [stdout]    |                                             ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/remquof.rs:12:46
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn remquof(x: f32, y: f32) -> (f32, i32) {
[INFO] [stdout]    |                                              ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, f64)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/sincos.rs:12:37
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn sincos(x: f64) -> (f64, f64) {
[INFO] [stdout]    |                                     ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, f32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/sincosf.rs:12:38
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn sincosf(x: f32) -> (f32, f32) {
[INFO] [stdout]    |                                      ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/frexp.rs:12:36
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn frexp(x: f64) -> (f64, i32) {
[INFO] [stdout]    |                                    ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/frexpf.rs:12:37
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn frexpf(x: f32) -> (f32, i32) {
[INFO] [stdout]    |                                     ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/lgamma_r.rs:12:39
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn lgamma_r(x: f64) -> (f64, i32) {
[INFO] [stdout]    |                                       ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/lgammaf_r.rs:12:40
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn lgammaf_r(x: f32) -> (f32, i32) {
[INFO] [stdout]    |                                        ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, f64)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/modf.rs:12:35
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn modf(x: f64) -> (f64, f64) {
[INFO] [stdout]    |                                   ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, f32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/modff.rs:12:36
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn modff(x: f32) -> (f32, f32) {
[INFO] [stdout]    |                                    ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/remquo.rs:12:45
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn remquo(x: f64, y: f64) -> (f64, i32) {
[INFO] [stdout]    |                                             ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, i32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/remquof.rs:12:46
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn remquof(x: f32, y: f32) -> (f32, i32) {
[INFO] [stdout]    |                                              ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f64, f64)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/sincos.rs:12:37
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn sincos(x: f64) -> (f64, f64) {
[INFO] [stdout]    |                                     ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `(f32, f32)`, which is not FFI-safe
[INFO] [stdout]   --> src/math/sincosf.rs:12:38
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub extern "C" fn sincosf(x: f32) -> (f32, f32) {
[INFO] [stdout]    |                                      ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a struct instead
[INFO] [stdout]    = note: tuples have unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `Command { std: "docker" "inspect" "dae55861fd14550c6ad008ccebc164904862fa8e600dcb11703981fec24b92c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dae55861fd14550c6ad008ccebc164904862fa8e600dcb11703981fec24b92c9", kill_on_drop: false }`
[INFO] [stdout] dae55861fd14550c6ad008ccebc164904862fa8e600dcb11703981fec24b92c9