[INFO] fetching crate ambassador 0.3.5...
[INFO] checking ambassador-0.3.5 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate ambassador 0.3.5 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate ambassador 0.3.5 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 ambassador 0.3.5
[INFO] finished tweaking crates.io crate ambassador 0.3.5
[INFO] tweaked toml for crates.io crate ambassador 0.3.5 written to /workspace/builds/worker-7-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 58 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding compiletest_rs v0.8.0 (latest: v0.10.2)
[INFO] [stderr]       Adding itertools v0.10.5 (latest: v0.12.1)
[INFO] [stderr]       Adding miow v0.3.7 (latest: v0.6.0)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding rustfix v0.6.1 (latest: v0.8.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[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 tester v0.9.1
[INFO] [stderr]   Downloaded rustfix v0.6.1
[INFO] [stderr]   Downloaded getopts v0.2.21
[INFO] [stderr]   Downloaded compiletest_rs v0.8.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 01bea08eda36ab9fea860411ff526910179eccd7f60f4fed81cf67c83db047ee
[INFO] running `Command { std: "docker" "start" "-a" "01bea08eda36ab9fea860411ff526910179eccd7f60f4fed81cf67c83db047ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "01bea08eda36ab9fea860411ff526910179eccd7f60f4fed81cf67c83db047ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01bea08eda36ab9fea860411ff526910179eccd7f60f4fed81cf67c83db047ee", kill_on_drop: false }`
[INFO] [stdout] 01bea08eda36ab9fea860411ff526910179eccd7f60f4fed81cf67c83db047ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 3c975b45d0ca4dda2180b611014df20897489128243087374fa0f9ef47848bd8
[INFO] running `Command { std: "docker" "start" "-a" "3c975b45d0ca4dda2180b611014df20897489128243087374fa0f9ef47848bd8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling compiletest_rs v0.8.0
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking term v0.7.0
[INFO] [stderr]     Checking tester v0.9.1
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]     Checking ambassador v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Default` is imported redundantly
[INFO] [stdout]  --> src/derive.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::default::Default;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Default` is already defined here
[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 `Default` is imported redundantly
[INFO] [stdout]  --> src/derive.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::default::Default;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Default` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking rustfix v0.6.1
[INFO] [stdout] warning: the item `Default` is imported redundantly
[INFO] [stdout]  --> src/derive.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::default::Default;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Default` is already defined here
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.02s
[INFO] running `Command { std: "docker" "inspect" "3c975b45d0ca4dda2180b611014df20897489128243087374fa0f9ef47848bd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c975b45d0ca4dda2180b611014df20897489128243087374fa0f9ef47848bd8", kill_on_drop: false }`
[INFO] [stdout] 3c975b45d0ca4dda2180b611014df20897489128243087374fa0f9ef47848bd8
[INFO] checking ambassador-0.3.5 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate ambassador 0.3.5 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate ambassador 0.3.5 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ambassador 0.3.5
[INFO] finished tweaking crates.io crate ambassador 0.3.5
[INFO] tweaked toml for crates.io crate ambassador 0.3.5 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 019f6e73e5bf5173503824093be3b3917d4dbba019492c03d77e41bda5802c38
[INFO] running `Command { std: "docker" "start" "-a" "019f6e73e5bf5173503824093be3b3917d4dbba019492c03d77e41bda5802c38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "019f6e73e5bf5173503824093be3b3917d4dbba019492c03d77e41bda5802c38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "019f6e73e5bf5173503824093be3b3917d4dbba019492c03d77e41bda5802c38", kill_on_drop: false }`
[INFO] [stdout] 019f6e73e5bf5173503824093be3b3917d4dbba019492c03d77e41bda5802c38
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50dde8d7987c66b2d2319f626fbb911f6b2753fdfb5905e732a393973f5a33ba
[INFO] running `Command { std: "docker" "start" "-a" "50dde8d7987c66b2d2319f626fbb911f6b2753fdfb5905e732a393973f5a33ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking anyhow v1.0.81
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]    Compiling compiletest_rs v0.8.0
[INFO] [stderr]     Checking term v0.7.0
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking tester v0.9.1
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]     Checking ambassador v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Default` is imported redundantly
[INFO] [stdout]  --> src/derive.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::default::Default;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Default` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/util.rs:9:39
[INFO] [stdout]     |
[INFO] [stdout] 9   |       ($span:expr, $($rest:expr),*) => {Err(syn::parse::Error::new($span, format_args!($($rest),*)))};
[INFO] [stdout]     |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/derive.rs:109:33
[INFO] [stdout]     |
[INFO] [stdout] 109 |                       try_option!(error!(
[INFO] [stdout]     |  _________________________________-
[INFO] [stdout] 110 | |                         lit.span(),
[INFO] [stdout] 111 | |                         "\"target\" value for delegate attribute can only be specified once"
[INFO] [stdout] 112 | |                     ));
[INFO] [stdout]     | |_____________________- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ambassador` (lib) due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "50dde8d7987c66b2d2319f626fbb911f6b2753fdfb5905e732a393973f5a33ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50dde8d7987c66b2d2319f626fbb911f6b2753fdfb5905e732a393973f5a33ba", kill_on_drop: false }`
[INFO] [stdout] 50dde8d7987c66b2d2319f626fbb911f6b2753fdfb5905e732a393973f5a33ba