[INFO] cloning repository https://github.com/compenguy/pdftext
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/compenguy/pdftext" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcompenguy%2Fpdftext", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcompenguy%2Fpdftext'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a15270e57dd7a93abfcc1efe039896caf5125391
[INFO] checking compenguy/pdftext against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcompenguy%2Fpdftext" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/compenguy/pdftext on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/compenguy/pdftext
[INFO] finished tweaking git repo https://github.com/compenguy/pdftext
[INFO] tweaked toml for git repo https://github.com/compenguy/pdftext written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/compenguy/pdftext already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/pdf-rs/pdf/`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /workspace/builds/worker-13/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/pdf-rs/pdf/`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1f76c32381bfee470cbc160cc858ccfbb118e76715e0f007c0b240094e276ec3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1f76c32381bfee470cbc160cc858ccfbb118e76715e0f007c0b240094e276ec3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f76c32381bfee470cbc160cc858ccfbb118e76715e0f007c0b240094e276ec3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f76c32381bfee470cbc160cc858ccfbb118e76715e0f007c0b240094e276ec3", kill_on_drop: false }`
[INFO] [stdout] 1f76c32381bfee470cbc160cc858ccfbb118e76715e0f007c0b240094e276ec3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 084d6478ef09d6d9d2bb2920663423613d81ca330c94f0b78c21582bd906cb0c
[INFO] running `Command { std: "docker" "start" "-a" "084d6478ef09d6d9d2bb2920663423613d81ca330c94f0b78c21582bd906cb0c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking object v0.20.0
[INFO] [stderr]     Checking either v1.6.0
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]     Checking ordermap v0.2.13
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]    Compiling snafu-derive v0.4.4
[INFO] [stderr]     Checking jpeg-decoder v0.1.20
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]     Checking inflate v0.4.5
[INFO] [stderr]     Checking itertools v0.6.5
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking once_cell v0.2.4
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking snafu v0.4.4
[INFO] [stderr]    Compiling pdf_derive v0.1.20
[INFO] [stderr]     Checking pdf v0.7.0 (https://github.com/pdf-rs/pdf/#81779412)
[INFO] [stderr]     Checking pdftext v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the `?` operator can only be applied to values that implement `std::ops::Try`
[INFO] [stdout]   --> src/main.rs:19:42
[INFO] [stdout]    |
[INFO] [stdout] 19 |     println!("\nDocument has {} pages.", pdf.num_pages()?);
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^ the `?` operator cannot be applied to type `u32`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `std::ops::Try` is not implemented for `u32`
[INFO] [stdout]    = note: required by `std::ops::Try::into_result`
[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 E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pdftext`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0277]: the `?` operator can only be applied to values that implement `std::ops::Try`
[INFO] [stdout]   --> src/main.rs:19:42
[INFO] [stdout]    |
[INFO] [stdout] 19 |     println!("\nDocument has {} pages.", pdf.num_pages()?);
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^ the `?` operator cannot be applied to type `u32`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `std::ops::Try` is not implemented for `u32`
[INFO] [stdout]    = note: required by `std::ops::Try::into_result`
[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 E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "084d6478ef09d6d9d2bb2920663423613d81ca330c94f0b78c21582bd906cb0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "084d6478ef09d6d9d2bb2920663423613d81ca330c94f0b78c21582bd906cb0c", kill_on_drop: false }`
[INFO] [stdout] 084d6478ef09d6d9d2bb2920663423613d81ca330c94f0b78c21582bd906cb0c