[INFO] fetching crate free-algebra 0.1.0...
[INFO] checking free-algebra-0.1.0 against master#c9af9c1dc85a55e309345030ff9cb7ea247953fa for pr-151146-1
[INFO] extracting crate free-algebra 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate free-algebra 0.1.0
[INFO] finished tweaking crates.io crate free-algebra 0.1.0
[INFO] tweaked toml for crates.io crate free-algebra 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate free-algebra 0.1.0 on toolchain c9af9c1dc85a55e309345030ff9cb7ea247953fa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c9af9c1dc85a55e309345030ff9cb7ea247953fa" "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" "+c9af9c1dc85a55e309345030ff9cb7ea247953fa" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to latest compatible versions
[INFO] [stderr]       Adding derivative v1.0.4 (available: v2.2.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c9af9c1dc85a55e309345030ff9cb7ea247953fa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded maths-traits v0.2.1
[INFO] [stderr]   Downloaded derivative v1.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+c9af9c1dc85a55e309345030ff9cb7ea247953fa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a37a425d3fca20a858ea32c9254e999212fc136daf6bb69567b5a1f46714d38d
[INFO] running `Command { std: "docker" "start" "-a" "a37a425d3fca20a858ea32c9254e999212fc136daf6bb69567b5a1f46714d38d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a37a425d3fca20a858ea32c9254e999212fc136daf6bb69567b5a1f46714d38d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a37a425d3fca20a858ea32c9254e999212fc136daf6bb69567b5a1f46714d38d", kill_on_drop: false }`
[INFO] [stdout] a37a425d3fca20a858ea32c9254e999212fc136daf6bb69567b5a1f46714d38d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+c9af9c1dc85a55e309345030ff9cb7ea247953fa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4cbfcbaf997f69f8e1d8406d33325c2368db489bb2978cff72cd44678dd284ef
[INFO] running `Command { std: "docker" "start" "-a" "4cbfcbaf997f69f8e1d8406d33325c2368db489bb2978cff72cd44678dd284ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking maths-traits v0.2.1
[INFO] [stderr]    Compiling derivative v1.0.4
[INFO] [stderr]     Checking free-algebra v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]   --> src/lib.rs:77:12
[INFO] [stdout]    |
[INFO] [stdout] 77 | #![feature(specialization)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]    = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]   --> src/lib.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub use self::monoid::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ the name `Iter` in the type namespace is first re-exported here
[INFO] [stdout] 86 | pub use self::module::*;
[INFO] [stdout]    |         --------------- but the name `Iter` in the type namespace is also re-exported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ambiguous_glob_reexports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]   --> src/lib.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub use self::monoid::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ the name `IntoIter` in the type namespace is first re-exported here
[INFO] [stdout] 86 | pub use self::module::*;
[INFO] [stdout]    |         --------------- but the name `IntoIter` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]   --> src/lib.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub use self::monoid::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ the name `IterMut` in the type namespace is first re-exported here
[INFO] [stdout] 86 | pub use self::module::*;
[INFO] [stdout]    |         --------------- but the name `IterMut` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]   --> src/lib.rs:77:12
[INFO] [stdout]    |
[INFO] [stdout] 77 | #![feature(specialization)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]    = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]   --> src/lib.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub use self::monoid::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ the name `Iter` in the type namespace is first re-exported here
[INFO] [stdout] 86 | pub use self::module::*;
[INFO] [stdout]    |         --------------- but the name `Iter` in the type namespace is also re-exported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ambiguous_glob_reexports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]   --> src/lib.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub use self::monoid::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ the name `IntoIter` in the type namespace is first re-exported here
[INFO] [stdout] 86 | pub use self::module::*;
[INFO] [stdout]    |         --------------- but the name `IntoIter` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: ambiguous glob re-exports
[INFO] [stdout]   --> src/lib.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 | pub use self::monoid::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ the name `IterMut` in the type namespace is first re-exported here
[INFO] [stdout] 86 | pub use self::module::*;
[INFO] [stdout]    |         --------------- but the name `IterMut` in the type namespace is also re-exported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/monoid.rs:268:27
[INFO] [stdout]     |
[INFO] [stdout] 268 |     #[inline] pub fn iter(&self) -> Iter<C> { self.string.iter() }
[INFO] [stdout]     |                           ^^^^^     ^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 268 |     #[inline] pub fn iter(&self) -> Iter<'_, C> { self.string.iter() }
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/monoid.rs:292:31
[INFO] [stdout]     |
[INFO] [stdout] 292 |     #[inline] pub fn iter_mut(&mut self) -> IterMut<C,M> where M:MonoidRule<C> {
[INFO] [stdout]     |                               ^^^^^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 292 |     #[inline] pub fn iter_mut(&mut self) -> IterMut<'_, C,M> where M:MonoidRule<C> {
[INFO] [stdout]     |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/monoid.rs:268:27
[INFO] [stdout]     |
[INFO] [stdout] 268 |     #[inline] pub fn iter(&self) -> Iter<C> { self.string.iter() }
[INFO] [stdout]     |                           ^^^^^     ^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 268 |     #[inline] pub fn iter(&self) -> Iter<'_, C> { self.string.iter() }
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/monoid.rs:292:31
[INFO] [stdout]     |
[INFO] [stdout] 292 |     #[inline] pub fn iter_mut(&mut self) -> IterMut<C,M> where M:MonoidRule<C> {
[INFO] [stdout]     |                               ^^^^^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 292 |     #[inline] pub fn iter_mut(&mut self) -> IterMut<'_, C,M> where M:MonoidRule<C> {
[INFO] [stdout]     |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.07s
[INFO] running `Command { std: "docker" "inspect" "4cbfcbaf997f69f8e1d8406d33325c2368db489bb2978cff72cd44678dd284ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4cbfcbaf997f69f8e1d8406d33325c2368db489bb2978cff72cd44678dd284ef", kill_on_drop: false }`
[INFO] [stdout] 4cbfcbaf997f69f8e1d8406d33325c2368db489bb2978cff72cd44678dd284ef
