[INFO] updating cached repository https://github.com/fijk/png-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39d416b427ba5f9b4b8f447b46851ff20f131615
[INFO] testing fijk/png-rs against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffijk%2Fpng-rs" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fijk/png-rs on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fijk/png-rs
[INFO] finished tweaking git repo https://github.com/fijk/png-rs
[INFO] tweaked toml for git repo https://github.com/fijk/png-rs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/fijk/png-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1511764c2a0ba3e0c6b3f77911776c2ecb8ccb80526e5507df77882b01b139f3
[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" "1511764c2a0ba3e0c6b3f77911776c2ecb8ccb80526e5507df77882b01b139f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1511764c2a0ba3e0c6b3f77911776c2ecb8ccb80526e5507df77882b01b139f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1511764c2a0ba3e0c6b3f77911776c2ecb8ccb80526e5507df77882b01b139f3", kill_on_drop: false }`
[INFO] [stdout] 1511764c2a0ba3e0c6b3f77911776c2ecb8ccb80526e5507df77882b01b139f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 507b5da2d0ce73a266a8f78ad25559fc9d1baeefd90dc94100d00aa969f4c2b7
[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" "507b5da2d0ce73a266a8f78ad25559fc9d1baeefd90dc94100d00aa969f4c2b7", kill_on_drop: false }`
[INFO] [stderr]    Compiling build_const v0.2.1
[INFO] [stderr]    Compiling byteorder v1.2.3
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]    Compiling png-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::iter::FromIterator`
[INFO] [stdout]    --> src/lib.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 use std::iter::FromIterator;
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:198:23
[INFO] [stdout]     |
[INFO] [stdout] 198 |                 self.data.len() * 3 as u32
[INFO] [stdout]     |                                   ^^^^^^^^ expected `usize`, found `u32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:198:5
[INFO] [stdout]     |
[INFO] [stdout] 197 |             fn length(&self) -> u32 {
[INFO] [stdout]     |                                 --- expected `u32` because of return type
[INFO] [stdout] 198 |                 self.data.len() * 3 as u32
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u32`, found `usize`
[INFO] [stdout]     |
[INFO] [stdout] help: you can convert an `usize` to `u32` and panic if the converted value wouldn't fit
[INFO] [stdout]     |
[INFO] [stdout] 198 |                 (self.data.len() * 3 as u32).try_into().unwrap()
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: cannot multiply `u32` to `usize`
[INFO] [stdout]    --> src/lib.rs:198:21
[INFO] [stdout]     |
[INFO] [stdout] 198 |                 self.data.len() * 3 as u32
[INFO] [stdout]     |                                 ^ no implementation for `usize * u32`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `std::ops::Mul<u32>` is not implemented for `usize`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:201:30
[INFO] [stdout]     |
[INFO] [stdout] 201 |             fn from(data: Vec<u8>) -> Self {
[INFO] [stdout]     |                ----                   ^^^^ expected struct `format::chunks::PaletteChunk`, found `()`
[INFO] [stdout]     |                |
[INFO] [stdout]     |                implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `png-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "507b5da2d0ce73a266a8f78ad25559fc9d1baeefd90dc94100d00aa969f4c2b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "507b5da2d0ce73a266a8f78ad25559fc9d1baeefd90dc94100d00aa969f4c2b7", kill_on_drop: false }`
[INFO] [stdout] 507b5da2d0ce73a266a8f78ad25559fc9d1baeefd90dc94100d00aa969f4c2b7