[INFO] fetching crate extendr-api 0.6.0...
[INFO] checking extendr-api-0.6.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate extendr-api 0.6.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate extendr-api 0.6.0 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate extendr-api 0.6.0
[INFO] finished tweaking crates.io crate extendr-api 0.6.0
[INFO] tweaked toml for crates.io crate extendr-api 0.6.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 77 packages
[INFO] [stderr]       Adding bindgen v0.64.0 (latest: v0.69.4)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding linux-raw-sys v0.4.13 (latest: v0.6.4)
[INFO] [stderr]       Adding peeking_take_while v0.1.2 (latest: v1.0.0)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding which v4.4.2 (latest: v6.0.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded extendr-engine v0.6.0
[INFO] [stderr]   Downloaded extendr-macros v0.6.0
[INFO] [stderr]   Downloaded libR-sys v0.6.0
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c588c33eb89ce403a3fd2cb8816f84b134dd7a7005445f343056bc403db983fd
[INFO] running `Command { std: "docker" "start" "-a" "c588c33eb89ce403a3fd2cb8816f84b134dd7a7005445f343056bc403db983fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c588c33eb89ce403a3fd2cb8816f84b134dd7a7005445f343056bc403db983fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c588c33eb89ce403a3fd2cb8816f84b134dd7a7005445f343056bc403db983fd", kill_on_drop: false }`
[INFO] [stdout] c588c33eb89ce403a3fd2cb8816f84b134dd7a7005445f343056bc403db983fd
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 62c8fdff9db699b137022acf53821f9677fe803bb9942f0f04245ba919fb4e48
[INFO] running `Command { std: "docker" "start" "-a" "62c8fdff9db699b137022acf53821f9677fe803bb9942f0f04245ba919fb4e48", kill_on_drop: false }`
[INFO] [stderr]    Compiling libR-sys v0.6.0
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling relative-path v1.9.2
[INFO] [stderr]    Compiling extendr-api v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling extendr-engine v0.6.0
[INFO] [stderr]    Compiling rstest_macros v0.18.2
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling ctor v0.2.7
[INFO] [stderr]    Compiling extendr-macros v0.6.0
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stdout] warning: the item `IntoRobj` is imported redundantly
[INFO] [stdout]  --> src/metadata.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::robj::IntoRobj;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 6 | use crate::*;
[INFO] [stdout]   |     -------- the item `IntoRobj` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::na::*`
[INFO] [stdout]   --> src/prelude.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub use super::na::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::optional::*`
[INFO] [stdout]   --> src/prelude.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 | pub use super::optional::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `IntoIterator` is imported redundantly
[INFO] [stdout]   --> src/robj/mod.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use std::iter::IntoIterator;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `IntoIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `MatrixConversions` is imported redundantly
[INFO] [stdout]  --> src/robj/from_robj.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `MatrixConversions` is already imported here
[INFO] [stdout] 2 | use crate::wrapper::matrix::MatrixConversions;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `single_threaded` is imported redundantly
[INFO] [stdout]  --> src/robj/into_robj.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `single_threaded` is already imported here
[INFO] [stdout] 2 | use crate::scalar::Scalar;
[INFO] [stdout] 3 | use crate::single_threaded;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `operators::*`
[INFO] [stdout]   --> src/robj/mod.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub use operators::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/scalar/rbool.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::*;
[INFO] [stdout]   |     -------- the item `TryFrom` is already imported here
[INFO] [stdout] 4 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/scalar/rfloat.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::*;
[INFO] [stdout]   |     -------- the item `TryFrom` is already imported here
[INFO] [stdout] 4 | use std::cmp::Ordering::*;
[INFO] [stdout] 5 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/scalar/rint.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::*;
[INFO] [stdout]   |     -------- the item `TryFrom` is already imported here
[INFO] [stdout] 4 | use std::cmp::Ordering::*;
[INFO] [stdout] 5 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `GetSexp` is imported redundantly
[INFO] [stdout]  --> src/wrapper/mod.rs:4:19
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::robj::{GetSexp, Rinternals};
[INFO] [stdout]   |                   ^^^^^^^
[INFO] [stdout] 5 | use crate::*;
[INFO] [stdout]   |     -------- the item `GetSexp` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rbool` is imported redundantly
[INFO] [stdout]  --> src/wrapper/altrep.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use prelude::{Rbool, Rcplx, Rfloat, Rint, Scalar};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 2 |
[INFO] [stdout] 3 | use super::*;
[INFO] [stdout]   |     -------- the item `Rbool` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/complexes.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/doubles.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/integers.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Attributes` is imported redundantly
[INFO] [stdout]  --> src/wrapper/list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::robj::Attributes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 4 | use super::*;
[INFO] [stdout]   |     -------- the item `Attributes` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rbool` is imported redundantly
[INFO] [stdout]  --> src/wrapper/logicals.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::scalar::{Rbool, Scalar};
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout] 2 | use super::*;
[INFO] [stdout]   |     -------- the item `Rbool` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/logicals.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `GetSexp` is imported redundantly
[INFO] [stdout]  --> src/wrapper/matrix.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use super::*;
[INFO] [stdout]   |     -------- the item `GetSexp` is already imported here
[INFO] [stdout] 4 | use crate::robj::GetSexp;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/wrapper/strings.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/strings.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rmacros::*`
[INFO] [stdout]    --> src/lib.rs:388:9
[INFO] [stdout]     |
[INFO] [stdout] 388 | pub use rmacros::*;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/wrapper/strings.rs:112:13
[INFO] [stdout]     |
[INFO] [stdout] 112 |         let mut robj = Strings::alloc_vector(STRSXP, len);
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking rstest v0.18.2
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> tests/from_iterator_tests.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 |     struct PlzBreak(i32);
[INFO] [stdout]   |            -------- ^^^
[INFO] [stdout]   |            |
[INFO] [stdout]   |            field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = note: `PlzBreak` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 9 |     struct PlzBreak(());
[INFO] [stdout]   |                     ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `extendr_engine::with_r`
[INFO] [stdout]  --> tests/altrep_tests.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use extendr_engine::with_r;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `IntoRobj` is imported redundantly
[INFO] [stdout]  --> src/metadata.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::robj::IntoRobj;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 6 | use crate::*;
[INFO] [stdout]   |     -------- the item `IntoRobj` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rf_ScalarInteger` is imported redundantly
[INFO] [stdout]    --> src/ownership.rs:231:20
[INFO] [stdout]     |
[INFO] [stdout] 230 |     use crate::*;
[INFO] [stdout]     |         -------- the item `Rf_ScalarInteger` is already imported here
[INFO] [stdout] 231 |     use libR_sys::{Rf_ScalarInteger, Rf_protect, Rf_unprotect};
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rf_protect` is imported redundantly
[INFO] [stdout]    --> src/ownership.rs:231:38
[INFO] [stdout]     |
[INFO] [stdout] 229 |     use super::*;
[INFO] [stdout]     |         -------- the item `Rf_protect` is already imported here
[INFO] [stdout] 230 |     use crate::*;
[INFO] [stdout] 231 |     use libR_sys::{Rf_ScalarInteger, Rf_protect, Rf_unprotect};
[INFO] [stdout]     |                                      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rf_unprotect` is imported redundantly
[INFO] [stdout]    --> src/ownership.rs:231:50
[INFO] [stdout]     |
[INFO] [stdout] 229 |     use super::*;
[INFO] [stdout]     |         -------- the item `Rf_unprotect` is already imported here
[INFO] [stdout] 230 |     use crate::*;
[INFO] [stdout] 231 |     use libR_sys::{Rf_ScalarInteger, Rf_protect, Rf_unprotect};
[INFO] [stdout]     |                                                  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::na::*`
[INFO] [stdout]   --> src/prelude.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub use super::na::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::optional::*`
[INFO] [stdout]   --> src/prelude.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 | pub use super::optional::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `IntoIterator` is imported redundantly
[INFO] [stdout]   --> src/robj/mod.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use std::iter::IntoIterator;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `IntoIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `MatrixConversions` is imported redundantly
[INFO] [stdout]  --> src/robj/from_robj.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `MatrixConversions` is already imported here
[INFO] [stdout] 2 | use crate::wrapper::matrix::MatrixConversions;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `single_threaded` is imported redundantly
[INFO] [stdout]  --> src/robj/into_robj.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     -------- the item `single_threaded` is already imported here
[INFO] [stdout] 2 | use crate::scalar::Scalar;
[INFO] [stdout] 3 | use crate::single_threaded;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `operators::*`
[INFO] [stdout]   --> src/robj/mod.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub use operators::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/scalar/rbool.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::*;
[INFO] [stdout]   |     -------- the item `TryFrom` is already imported here
[INFO] [stdout] 4 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/scalar/rfloat.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::*;
[INFO] [stdout]   |     -------- the item `TryFrom` is already imported here
[INFO] [stdout] 4 | use std::cmp::Ordering::*;
[INFO] [stdout] 5 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]  --> src/scalar/rint.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::*;
[INFO] [stdout]   |     -------- the item `TryFrom` is already imported here
[INFO] [stdout] 4 | use std::cmp::Ordering::*;
[INFO] [stdout] 5 | use std::convert::TryFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `GetSexp` is imported redundantly
[INFO] [stdout]  --> src/wrapper/mod.rs:4:19
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::robj::{GetSexp, Rinternals};
[INFO] [stdout]   |                   ^^^^^^^
[INFO] [stdout] 5 | use crate::*;
[INFO] [stdout]   |     -------- the item `GetSexp` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rbool` is imported redundantly
[INFO] [stdout]  --> src/wrapper/altrep.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use prelude::{Rbool, Rcplx, Rfloat, Rint, Scalar};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 2 |
[INFO] [stdout] 3 | use super::*;
[INFO] [stdout]   |     -------- the item `Rbool` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/complexes.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/doubles.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/integers.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Attributes` is imported redundantly
[INFO] [stdout]  --> src/wrapper/list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::robj::Attributes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 4 | use super::*;
[INFO] [stdout]   |     -------- the item `Attributes` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rbool` is imported redundantly
[INFO] [stdout]  --> src/wrapper/logicals.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::scalar::{Rbool, Scalar};
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout] 2 | use super::*;
[INFO] [stdout]   |     -------- the item `Rbool` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/logicals.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `GetSexp` is imported redundantly
[INFO] [stdout]  --> src/wrapper/matrix.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use super::*;
[INFO] [stdout]   |     -------- the item `GetSexp` is already imported here
[INFO] [stdout] 4 | use crate::robj::GetSexp;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/wrapper/strings.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]  --> src/wrapper/strings.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::iter::FromIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `FromIterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rmacros::*`
[INFO] [stdout]    --> src/lib.rs:388:9
[INFO] [stdout]     |
[INFO] [stdout] 388 | pub use rmacros::*;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `matrix`
[INFO] [stdout]    --> src/wrapper/matrix.rs:421:13
[INFO] [stdout]     |
[INFO] [stdout] 421 |         let matrix = RMatrix::new_matrix(n_x, n_y, |r, c| res[c][r]);
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_matrix`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/wrapper/strings.rs:112:13
[INFO] [stdout]     |
[INFO] [stdout] 112 |         let mut robj = Strings::alloc_vector(STRSXP, len);
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.22s
[INFO] running `Command { std: "docker" "inspect" "62c8fdff9db699b137022acf53821f9677fe803bb9942f0f04245ba919fb4e48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62c8fdff9db699b137022acf53821f9677fe803bb9942f0f04245ba919fb4e48", kill_on_drop: false }`
[INFO] [stdout] 62c8fdff9db699b137022acf53821f9677fe803bb9942f0f04245ba919fb4e48