[INFO] fetching crate mockall 0.11.1...
[INFO] documenting mockall-0.11.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate mockall 0.11.1 into /workspace/builds/worker-21/source
[INFO] validating manifest of crates.io crate mockall 0.11.1 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mockall 0.11.1
[INFO] removed 1 missing examples
[INFO] finished tweaking crates.io crate mockall 0.11.1
[INFO] tweaked toml for crates.io crate mockall 0.11.1 written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] crate crates.io crate mockall 0.11.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mockall_double v0.3.0
[INFO] [stderr]   Downloaded downcast v0.11.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.38
[INFO] [stderr]   Downloaded mockall_derive v0.11.1
[INFO] [stderr]   Downloaded predicates v2.1.1
[INFO] [stderr]   Downloaded syn v1.0.94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a1371b21e3ded1d5d0118707bba8e50c259eb717455b7ffd152da7530dc4dd7d
[INFO] running `Command { std: "docker" "start" "-a" "a1371b21e3ded1d5d0118707bba8e50c259eb717455b7ffd152da7530dc4dd7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a1371b21e3ded1d5d0118707bba8e50c259eb717455b7ffd152da7530dc4dd7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1371b21e3ded1d5d0118707bba8e50c259eb717455b7ffd152da7530dc4dd7d", kill_on_drop: false }`
[INFO] [stdout] a1371b21e3ded1d5d0118707bba8e50c259eb717455b7ffd152da7530dc4dd7d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ded75f1e3e776d8c20ba958ef2564bf65ad04f538b44175b11e59d24d1301382
[INFO] running `Command { std: "docker" "start" "-a" "ded75f1e3e776d8c20ba958ef2564bf65ad04f538b44175b11e59d24d1301382", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling syn v1.0.94
[INFO] [stderr]     Checking predicates-core v1.0.3
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]     Checking termtree v0.2.4
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]     Checking fragile v1.2.0
[INFO] [stderr]     Checking downcast v0.11.0
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking predicates-tree v1.0.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking predicates v2.1.1
[INFO] [stderr]    Compiling mockall_derive v0.11.1
[INFO] [stderr]  Documenting mockall v0.11.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.99s
[INFO] running `Command { std: "docker" "inspect" "ded75f1e3e776d8c20ba958ef2564bf65ad04f538b44175b11e59d24d1301382", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ded75f1e3e776d8c20ba958ef2564bf65ad04f538b44175b11e59d24d1301382", kill_on_drop: false }`
[INFO] [stdout] ded75f1e3e776d8c20ba958ef2564bf65ad04f538b44175b11e59d24d1301382
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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=warn" "-e" "DOCS_RS=1" "-e" "RUSTC_BOOTSTRAP=1" "-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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "rustdoc" "--lib" "-Zrustdoc-map" "--features" "nightly" "--frozen" "--message-format=json" "--" "-Z" "unstable-options" "--document-private-items", kill_on_drop: false }`
[INFO] [stdout] 18c4d576399088a09f891b4c99e592c2d0ce0cc25599502b22c26bdc88c0d4dc
[INFO] running `Command { std: "docker" "start" "-a" "18c4d576399088a09f891b4c99e592c2d0ce0cc25599502b22c26bdc88c0d4dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling syn v1.0.94
[INFO] [stderr]     Checking predicates-core v1.0.3
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]     Checking termtree v0.2.4
[INFO] [stderr]     Checking downcast v0.11.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking fragile v1.2.0
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking predicates-tree v1.0.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking predicates v2.1.1
[INFO] [stderr]    Compiling mockall_derive v0.11.1
[INFO] [stdout] error[E0599]: no method named `unstable` found for struct `proc_macro2::Span` in the current scope
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mockall_derive-0.11.1/src/lib.rs:47:18
[INFO] [stdout]    |
[INFO] [stdout] 47 |             span.unstable()
[INFO] [stdout]    |                  ^^^^^^^^ method not found in `proc_macro2::Span`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mockall_derive` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "18c4d576399088a09f891b4c99e592c2d0ce0cc25599502b22c26bdc88c0d4dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18c4d576399088a09f891b4c99e592c2d0ce0cc25599502b22c26bdc88c0d4dc", kill_on_drop: false }`
[INFO] [stdout] 18c4d576399088a09f891b4c99e592c2d0ce0cc25599502b22c26bdc88c0d4dc