[INFO] fetching crate flow_macro 0.42.0...
[INFO] testing flow_macro-0.42.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate flow_macro 0.42.0 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate flow_macro 0.42.0
[INFO] finished tweaking crates.io crate flow_macro 0.42.0
[INFO] tweaked toml for crates.io crate flow_macro 0.42.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate flow_macro 0.42.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 70 packages to latest compatible versions
[INFO] [stderr]       Adding flowcore v0.42.0 (available: v0.142.0)
[INFO] [stderr]       Adding simpath v2.3.0 (available: v2.5.0)
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.106)
[INFO] [stderr]       Adding toml v0.5.11 (available: v0.9.7)
[INFO] [stderr]       Adding url v2.2.2 (available: v2.5.7)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded windows-link v0.2.0
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9848d470db567948e5f24226aba1df851e6181d8d4baee10e8e33399a39f845f
[INFO] running `Command { std: "docker" "start" "-a" "9848d470db567948e5f24226aba1df851e6181d8d4baee10e8e33399a39f845f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9848d470db567948e5f24226aba1df851e6181d8d4baee10e8e33399a39f845f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9848d470db567948e5f24226aba1df851e6181d8d4baee10e8e33399a39f845f", kill_on_drop: false }`
[INFO] [stdout] 9848d470db567948e5f24226aba1df851e6181d8d4baee10e8e33399a39f845f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fdaecdd3324cfa420149292d41a9237440ed34a212f0a8730b0f9ccccd17276d
[INFO] running `Command { std: "docker" "start" "-a" "fdaecdd3324cfa420149292d41a9237440ed34a212f0a8730b0f9ccccd17276d", kill_on_drop: false }`
[INFO] [stderr]    Compiling shlex v1.3.0
[INFO] [stderr]    Compiling find-msvc-tools v0.1.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling pkg-config v0.3.32
[INFO] [stderr]    Compiling vcpkg v0.2.15
[INFO] [stderr]    Compiling unicode-ident v1.0.19
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling libc v0.2.176
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling tinyvec_macros v0.1.1
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]    Compiling autocfg v1.5.0
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling gimli v0.32.3
[INFO] [stderr]    Compiling tinyvec v1.10.0
[INFO] [stderr]    Compiling matches v0.1.10
[INFO] [stderr]    Compiling version_check v0.9.5
[INFO] [stderr]    Compiling cc v1.2.39
[INFO] [stderr]    Compiling unicode-bidi v0.3.18
[INFO] [stderr]    Compiling curl v0.4.49
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling adler2 v2.0.1
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling miniz_oxide v0.8.9
[INFO] [stderr]    Compiling openssl-probe v0.1.6
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.24
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling rustc-demangle v0.1.26
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling either v1.15.0
[INFO] [stderr]    Compiling ryu v1.0.20
[INFO] [stderr]    Compiling hashbrown v0.12.3
[INFO] [stderr]    Compiling cfg-if v1.0.3
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling itoa v1.0.15
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling log v0.4.28
[INFO] [stderr]    Compiling idna v0.2.3
[INFO] [stderr]    Compiling socket2 v0.6.0
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling libz-sys v1.1.22
[INFO] [stderr]    Compiling openssl-sys v0.9.109
[INFO] [stderr]    Compiling curl-sys v0.4.83+curl-8.15.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling addr2line v0.25.1
[INFO] [stderr]    Compiling backtrace v0.3.76
[INFO] [stderr]    Compiling shrinkwraprs v0.3.0
[INFO] [stderr]    Compiling url v2.2.2
[INFO] [stderr]    Compiling serde_yaml v0.8.26
[INFO] [stderr]    Compiling toml v0.5.11
[INFO] [stderr]    Compiling simpath v2.3.0
[INFO] [stderr]    Compiling flowcore v0.42.0
[INFO] [stderr]    Compiling flow_macro v0.42.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro_span)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `source_file` found for struct `proc_macro::Span` in the current scope
[INFO] [stdout]   --> src/lib.rs:25:41
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let implementation_file_path = span.source_file().path().canonicalize()
[INFO] [stdout]    |                                         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `source` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 25 -     let implementation_file_path = span.source_file().path().canonicalize()
[INFO] [stdout] 25 +     let implementation_file_path = span.source().path().canonicalize()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flow_macro` (lib) due to 2 previous errors
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "fdaecdd3324cfa420149292d41a9237440ed34a212f0a8730b0f9ccccd17276d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdaecdd3324cfa420149292d41a9237440ed34a212f0a8730b0f9ccccd17276d", kill_on_drop: false }`
[INFO] [stdout] fdaecdd3324cfa420149292d41a9237440ed34a212f0a8730b0f9ccccd17276d