[INFO] fetching crate loopable 0.1.0...
[INFO] building loopable-0.1.0 against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] extracting crate loopable 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate loopable 0.1.0 on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate loopable 0.1.0
[INFO] finished tweaking crates.io crate loopable 0.1.0
[INFO] tweaked toml for crates.io crate loopable 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate loopable 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] beb0446228fb46b0bfad57461e1d7e4ff67923eb5c11fb39dc3eb776192b9b2b
[INFO] running `Command { std: "docker" "start" "-a" "beb0446228fb46b0bfad57461e1d7e4ff67923eb5c11fb39dc3eb776192b9b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "beb0446228fb46b0bfad57461e1d7e4ff67923eb5c11fb39dc3eb776192b9b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "beb0446228fb46b0bfad57461e1d7e4ff67923eb5c11fb39dc3eb776192b9b2b", kill_on_drop: false }`
[INFO] [stdout] beb0446228fb46b0bfad57461e1d7e4ff67923eb5c11fb39dc3eb776192b9b2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c5076b78f5cc2a3d27b78913679880bd82c6ab1436bc11e0b551ec0434fe1ca
[INFO] running `Command { std: "docker" "start" "-a" "0c5076b78f5cc2a3d27b78913679880bd82c6ab1436bc11e0b551ec0434fe1ca", kill_on_drop: false }`
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling loopable v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/gen_range.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<T: Rangeable> GenRangeIterator<T> {
[INFO] [stdout]    | -------------------------------------- associated function in this implementation
[INFO] [stdout] 23 |     pub fn new(start: T, stop: T, step: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `IterCombi` is never used
[INFO] [stdout]   --> src/combi.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub trait IterCombi: Iterator + Sized {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_c` is never used
[INFO] [stdout]   --> src/main.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn print_c<I: Iterator<Item=String>>(v:I) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `Command { std: "docker" "inspect" "0c5076b78f5cc2a3d27b78913679880bd82c6ab1436bc11e0b551ec0434fe1ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c5076b78f5cc2a3d27b78913679880bd82c6ab1436bc11e0b551ec0434fe1ca", kill_on_drop: false }`
[INFO] [stdout] 0c5076b78f5cc2a3d27b78913679880bd82c6ab1436bc11e0b551ec0434fe1ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57b4545671e7a504babfe81ff4259d65b3a6bb31942536ca383eabb47098153c
[INFO] running `Command { std: "docker" "start" "-a" "57b4545671e7a504babfe81ff4259d65b3a6bb31942536ca383eabb47098153c", kill_on_drop: false }`
[INFO] [stderr]    Compiling loopable v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/gen_range.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl<T: Rangeable> GenRangeIterator<T> {
[INFO] [stdout]    | -------------------------------------- associated function in this implementation
[INFO] [stdout] 23 |     pub fn new(start: T, stop: T, step: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `IterCombi` is never used
[INFO] [stdout]   --> src/combi.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub trait IterCombi: Iterator + Sized {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/combi.rs:95:42
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let v : Vec<&str> = s.split(" ").intersperse(",").collect();
[INFO] [stdout]    |                                          ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `itertools::Itertools::intersperse(...)` to keep using the current method
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout] help: add `#![feature(iter_intersperse)]` to the crate attributes to enable `std::iter::Iterator::intersperse`
[INFO] [stdout]   --> src/lib.rs:2:1
[INFO] [stdout]    |
[INFO] [stdout] 2  + #![feature(iter_intersperse)]
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_c` is never used
[INFO] [stdout]   --> src/main.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn print_c<I: Iterator<Item=String>>(v:I) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.23s
[INFO] running `Command { std: "docker" "inspect" "57b4545671e7a504babfe81ff4259d65b3a6bb31942536ca383eabb47098153c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57b4545671e7a504babfe81ff4259d65b3a6bb31942536ca383eabb47098153c", kill_on_drop: false }`
[INFO] [stdout] 57b4545671e7a504babfe81ff4259d65b3a6bb31942536ca383eabb47098153c