[INFO] cloning repository https://github.com/maxcell/rewrite-exercise [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/maxcell/rewrite-exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxcell%2Frewrite-exercise", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxcell%2Frewrite-exercise'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 96a8a40a938f2f24c2e9c183757db1424c43ff96 [INFO] checking maxcell/rewrite-exercise against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxcell%2Frewrite-exercise" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/maxcell/rewrite-exercise on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/maxcell/rewrite-exercise [INFO] finished tweaking git repo https://github.com/maxcell/rewrite-exercise [INFO] tweaked toml for git repo https://github.com/maxcell/rewrite-exercise written to /workspace/builds/worker-0-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/maxcell/rewrite-exercise 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded selectors v0.21.0 [INFO] [stderr] Downloaded cssparser-macros v0.3.6 [INFO] [stderr] Downloaded procedural-masquerade v0.1.7 [INFO] [stderr] Downloaded cssparser v0.25.9 [INFO] [stderr] Downloaded lol_html v0.2.0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] f75a04e0e1ee6eb7db8fc92e134923d08864818be8688a2122bca493bc0d3b40 [INFO] running `Command { std: "docker" "start" "-a" "f75a04e0e1ee6eb7db8fc92e134923d08864818be8688a2122bca493bc0d3b40", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "f75a04e0e1ee6eb7db8fc92e134923d08864818be8688a2122bca493bc0d3b40", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f75a04e0e1ee6eb7db8fc92e134923d08864818be8688a2122bca493bc0d3b40", kill_on_drop: false }` [INFO] [stdout] f75a04e0e1ee6eb7db8fc92e134923d08864818be8688a2122bca493bc0d3b40 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=forbid" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d392b0f8fa861050e149d62e67878321b321aa4b1ea6c5e47439f88b767ab390 [INFO] running `Command { std: "docker" "start" "-a" "d392b0f8fa861050e149d62e67878321b321aa4b1ea6c5e47439f88b767ab390", kill_on_drop: false }` [INFO] [stderr] Compiling autocfg v0.1.7 [INFO] [stderr] Compiling rand_core v0.4.2 [INFO] [stderr] Compiling libc v0.2.106 [INFO] [stderr] Compiling proc-macro2 v1.0.32 [INFO] [stderr] Compiling syn v1.0.81 [INFO] [stderr] Compiling siphasher v0.2.3 [INFO] [stderr] Compiling maybe-uninit v2.0.0 [INFO] [stderr] Checking dtoa v0.4.8 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling procedural-masquerade v0.1.7 [INFO] [stderr] Compiling memchr v2.4.1 [INFO] [stderr] Checking nodrop v0.1.14 [INFO] [stderr] Checking itoa v0.4.8 [INFO] [stderr] Compiling encoding_rs v0.8.29 [INFO] [stderr] Checking matches v0.1.9 [INFO] [stderr] Checking byteorder v1.4.3 [INFO] [stderr] Checking stable_deref_trait v1.2.0 [INFO] [stderr] Checking dtoa-short v0.3.3 [INFO] [stderr] Checking precomputed-hash v0.1.1 [INFO] [stderr] Checking phf_shared v0.7.24 [INFO] [stderr] Checking servo_arc v0.1.1 [INFO] [stderr] Checking thin-slice v0.1.1 [INFO] [stderr] Checking safemem v0.3.3 [INFO] [stderr] Checking lazycell v1.3.0 [INFO] [stderr] Compiling rand_core v0.3.1 [INFO] [stderr] Compiling rand_jitter v0.1.4 [INFO] [stderr] Compiling rand_hc v0.1.0 [INFO] [stderr] Compiling rand_isaac v0.1.1 [INFO] [stderr] Compiling rand_xorshift v0.1.1 [INFO] [stderr] Checking phf v0.7.24 [INFO] [stderr] Checking cfg-if v0.1.10 [INFO] [stderr] Checking fxhash v0.2.1 [INFO] [stderr] Compiling rand_pcg v0.1.2 [INFO] [stderr] Compiling rand_chacha v0.1.1 [INFO] [stderr] Compiling rand v0.6.5 [INFO] [stderr] Checking smallvec v0.6.14 [INFO] [stderr] Compiling quote v1.0.10 [INFO] [stderr] Compiling rand_os v0.1.3 [INFO] [stderr] Compiling phf_generator v0.7.24 [INFO] [stderr] Compiling phf_codegen v0.7.24 [INFO] [stderr] Compiling selectors v0.21.0 [INFO] [stderr] Compiling cssparser v0.25.9 [INFO] [stderr] Compiling cssparser-macros v0.3.6 [INFO] [stderr] Compiling thiserror-impl v1.0.30 [INFO] [stderr] Checking thiserror v1.0.30 [INFO] [stderr] Checking lol_html v0.2.0 [INFO] [stderr] Checking beef v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.83s [INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: lol_html v0.2.0 [INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1` [INFO] running `Command { std: "docker" "inspect" "d392b0f8fa861050e149d62e67878321b321aa4b1ea6c5e47439f88b767ab390", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d392b0f8fa861050e149d62e67878321b321aa4b1ea6c5e47439f88b767ab390", kill_on_drop: false }` [INFO] [stdout] d392b0f8fa861050e149d62e67878321b321aa4b1ea6c5e47439f88b767ab390 [INFO] checking maxcell/rewrite-exercise against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxcell%2Frewrite-exercise" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/maxcell/rewrite-exercise on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/maxcell/rewrite-exercise [INFO] finished tweaking git repo https://github.com/maxcell/rewrite-exercise [INFO] tweaked toml for git repo https://github.com/maxcell/rewrite-exercise written to /workspace/builds/worker-0-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/maxcell/rewrite-exercise 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 49782a5141628429bd40d661ba01f874fe8f4fabb987dd794d5b273caf0b67da [INFO] running `Command { std: "docker" "start" "-a" "49782a5141628429bd40d661ba01f874fe8f4fabb987dd794d5b273caf0b67da", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "49782a5141628429bd40d661ba01f874fe8f4fabb987dd794d5b273caf0b67da", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "49782a5141628429bd40d661ba01f874fe8f4fabb987dd794d5b273caf0b67da", kill_on_drop: false }` [INFO] [stdout] 49782a5141628429bd40d661ba01f874fe8f4fabb987dd794d5b273caf0b67da [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 2a8e6adcaac2be01eb7dddc54b0d28b2818b8859ee30212ce7abf4d929ec2afd [INFO] running `Command { std: "docker" "start" "-a" "2a8e6adcaac2be01eb7dddc54b0d28b2818b8859ee30212ce7abf4d929ec2afd", kill_on_drop: false }` [INFO] [stderr] Compiling autocfg v0.1.7 [INFO] [stderr] Compiling rand_core v0.4.2 [INFO] [stderr] Compiling proc-macro2 v1.0.32 [INFO] [stderr] Compiling libc v0.2.106 [INFO] [stderr] Compiling syn v1.0.81 [INFO] [stderr] Compiling siphasher v0.2.3 [INFO] [stderr] Compiling maybe-uninit v2.0.0 [INFO] [stderr] Checking dtoa v0.4.8 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling procedural-masquerade v0.1.7 [INFO] [stderr] Checking byteorder v1.4.3 [INFO] [stderr] Compiling encoding_rs v0.8.29 [INFO] [stderr] Checking matches v0.1.9 [INFO] [stderr] Checking itoa v0.4.8 [INFO] [stderr] Checking stable_deref_trait v1.2.0 [INFO] [stderr] Checking nodrop v0.1.14 [INFO] [stderr] Compiling rand_core v0.3.1 [INFO] [stderr] Compiling rand_jitter v0.1.4 [INFO] [stderr] Compiling memchr v2.4.1 [INFO] [stderr] Compiling rand_isaac v0.1.1 [INFO] [stderr] Compiling rand_xorshift v0.1.1 [INFO] [stderr] Compiling rand_hc v0.1.0 [INFO] [stderr] Checking dtoa-short v0.3.3 [INFO] [stderr] Compiling phf_shared v0.7.24 [INFO] [stderr] Checking servo_arc v0.1.1 [INFO] [stderr] Checking thin-slice v0.1.1 [INFO] [stderr] Checking precomputed-hash v0.1.1 [INFO] [stderr] Checking fxhash v0.2.1 [INFO] [stderr] Checking lazycell v1.3.0 [INFO] [stderr] Checking cfg-if v0.1.10 [INFO] [stderr] Checking safemem v0.3.3 [INFO] [stderr] Checking phf v0.7.24 [INFO] [stderr] Compiling rand_chacha v0.1.1 [INFO] [stderr] Compiling rand_pcg v0.1.2 [INFO] [stderr] Compiling rand v0.6.5 [INFO] [stderr] Checking smallvec v0.6.14 [INFO] [stderr] Compiling rand_os v0.1.3 [INFO] [stderr] Compiling quote v1.0.10 [INFO] [stderr] Compiling phf_generator v0.7.24 [INFO] [stderr] Compiling phf_codegen v0.7.24 [INFO] [stderr] Compiling selectors v0.21.0 [INFO] [stderr] Compiling cssparser v0.25.9 [INFO] [stderr] Compiling cssparser-macros v0.3.6 [INFO] [stderr] Compiling thiserror-impl v1.0.30 [INFO] [stderr] Checking thiserror v1.0.30 [INFO] [stderr] Checking lol_html v0.2.0 [INFO] [stderr] Checking beef v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.56s [INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: lol_html v0.2.0 [INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1` [INFO] running `Command { std: "docker" "inspect" "2a8e6adcaac2be01eb7dddc54b0d28b2818b8859ee30212ce7abf4d929ec2afd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2a8e6adcaac2be01eb7dddc54b0d28b2818b8859ee30212ce7abf4d929ec2afd", kill_on_drop: false }` [INFO] [stdout] 2a8e6adcaac2be01eb7dddc54b0d28b2818b8859ee30212ce7abf4d929ec2afd