[INFO] cloning repository https://github.com/sambacha/mirror-mdbook-variable
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sambacha/mirror-mdbook-variable" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsambacha%2Fmirror-mdbook-variable", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsambacha%2Fmirror-mdbook-variable'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 10cb09e717fab5c6d7e5cce067ee6180101ddc5c
[INFO] building sambacha/mirror-mdbook-variable against master#44f415c1d617ebc7b931a243b7b321ef8a6ca47c for pr-142134-abi-ast-error
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsambacha%2Fmirror-mdbook-variable" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sambacha/mirror-mdbook-variable on toolchain 44f415c1d617ebc7b931a243b7b321ef8a6ca47c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
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[INFO] started tweaking git repo https://github.com/sambacha/mirror-mdbook-variable
[INFO] finished tweaking git repo https://github.com/sambacha/mirror-mdbook-variable
[INFO] tweaked toml for git repo https://github.com/sambacha/mirror-mdbook-variable written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sambacha/mirror-mdbook-variable 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" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]   Downloaded mdbook v0.4.35
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[INFO] running `Command { std: "docker" "start" "-a" "6a0fb499f59388835b9cc87664e41791483b88033950202d3a6270c23be9809e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a0fb499f59388835b9cc87664e41791483b88033950202d3a6270c23be9809e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a0fb499f59388835b9cc87664e41791483b88033950202d3a6270c23be9809e", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b94fcd2b402e2d72bf830a04244bfd8651b1ec3843741c3e5804915adc41ffe9
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[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:138:29
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn find_variables(contents: &str) -> VariablesIter {
[INFO] [stdout]     |                             ^^^^     ------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn find_variables(contents: &str) -> VariablesIter<'_> {
[INFO] [stdout]     |                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 03s
[INFO] running `Command { std: "docker" "inspect" "b94fcd2b402e2d72bf830a04244bfd8651b1ec3843741c3e5804915adc41ffe9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b94fcd2b402e2d72bf830a04244bfd8651b1ec3843741c3e5804915adc41ffe9", kill_on_drop: false }`
[INFO] [stdout] b94fcd2b402e2d72bf830a04244bfd8651b1ec3843741c3e5804915adc41ffe9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a6b4d619e883efc9a8cfc7d7cde1b71abbc99ab18d55314a59b9ee0d2e35f82
[INFO] running `Command { std: "docker" "start" "-a" "8a6b4d619e883efc9a8cfc7d7cde1b71abbc99ab18d55314a59b9ee0d2e35f82", kill_on_drop: false }`
[INFO] [stderr]    Compiling mdbook-variables v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:138:29
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn find_variables(contents: &str) -> VariablesIter {
[INFO] [stdout]     |                             ^^^^     ------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn find_variables(contents: &str) -> VariablesIter<'_> {
[INFO] [stdout]     |                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:138:29
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn find_variables(contents: &str) -> VariablesIter {
[INFO] [stdout]     |                             ^^^^     ------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn find_variables(contents: &str) -> VariablesIter<'_> {
[INFO] [stdout]     |                                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "8a6b4d619e883efc9a8cfc7d7cde1b71abbc99ab18d55314a59b9ee0d2e35f82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a6b4d619e883efc9a8cfc7d7cde1b71abbc99ab18d55314a59b9ee0d2e35f82", kill_on_drop: false }`
[INFO] [stdout] 8a6b4d619e883efc9a8cfc7d7cde1b71abbc99ab18d55314a59b9ee0d2e35f82