[INFO] fetching crate hashtree 0.4.2...
[INFO] checking hashtree-0.4.2 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate hashtree 0.4.2 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate hashtree 0.4.2 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hashtree 0.4.2
[INFO] finished tweaking crates.io crate hashtree 0.4.2
[INFO] tweaked toml for crates.io crate hashtree 0.4.2 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 12 packages
[INFO] [stderr]       Adding generic-array v0.14.7 (latest: v1.0.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fcf20fda1237038afbb3c8b356d0b0286f954caed06b64036ab16325cff7bb00
[INFO] running `Command { std: "docker" "start" "-a" "fcf20fda1237038afbb3c8b356d0b0286f954caed06b64036ab16325cff7bb00", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fcf20fda1237038afbb3c8b356d0b0286f954caed06b64036ab16325cff7bb00", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcf20fda1237038afbb3c8b356d0b0286f954caed06b64036ab16325cff7bb00", kill_on_drop: false }`
[INFO] [stdout] fcf20fda1237038afbb3c8b356d0b0286f954caed06b64036ab16325cff7bb00
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c7eef480e5d593ccf0cdd0c5fe92d4b910fe5b8037180251fc12aa4bc59b13a1
[INFO] running `Command { std: "docker" "start" "-a" "c7eef480e5d593ccf0cdd0c5fe92d4b910fe5b8037180251fc12aa4bc59b13a1", kill_on_drop: false }`
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]     Checking generic-array v0.14.7
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking hashtree v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tree.rs:124:39
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn insert<R: Read>(&mut self, data: &mut R) {
[INFO] [stdout]     |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tree.rs:124:39
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn insert<R: Read>(&mut self, data: &mut R) {
[INFO] [stdout]     |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "c7eef480e5d593ccf0cdd0c5fe92d4b910fe5b8037180251fc12aa4bc59b13a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7eef480e5d593ccf0cdd0c5fe92d4b910fe5b8037180251fc12aa4bc59b13a1", kill_on_drop: false }`
[INFO] [stdout] c7eef480e5d593ccf0cdd0c5fe92d4b910fe5b8037180251fc12aa4bc59b13a1
[INFO] checking hashtree-0.4.2 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate hashtree 0.4.2 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate hashtree 0.4.2 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hashtree 0.4.2
[INFO] finished tweaking crates.io crate hashtree 0.4.2
[INFO] tweaked toml for crates.io crate hashtree 0.4.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1bd2d753ab95ce57253028c730e3ceab691b17a9da1295b36a0ea8415d0b039d
[INFO] running `Command { std: "docker" "start" "-a" "1bd2d753ab95ce57253028c730e3ceab691b17a9da1295b36a0ea8415d0b039d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bd2d753ab95ce57253028c730e3ceab691b17a9da1295b36a0ea8415d0b039d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bd2d753ab95ce57253028c730e3ceab691b17a9da1295b36a0ea8415d0b039d", kill_on_drop: false }`
[INFO] [stdout] 1bd2d753ab95ce57253028c730e3ceab691b17a9da1295b36a0ea8415d0b039d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d3dad313613de429c214fc97c57d5e14e893e000c57f839c8877cb108486080b
[INFO] running `Command { std: "docker" "start" "-a" "d3dad313613de429c214fc97c57d5e14e893e000c57f839c8877cb108486080b", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking hashtree v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]    --> src/tree.rs:179:34
[INFO] [stdout]     |
[INFO] [stdout] 179 |                     Some(_) => { return false },
[INFO] [stdout]     |                                  ^^^^^^^^^^^^ cannot satisfy `_ -> _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]    --> src/tree.rs:179:34
[INFO] [stdout]     |
[INFO] [stdout] 179 |                     Some(_) => { return false },
[INFO] [stdout]     |                                  ^^^^^^^^^^^^ cannot satisfy `_ -> _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tree.rs:124:39
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn insert<R: Read>(&mut self, data: &mut R) {
[INFO] [stdout]     |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0284`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tree.rs:124:39
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn insert<R: Read>(&mut self, data: &mut R) {
[INFO] [stdout]     |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hashtree` (lib) due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0284`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hashtree` (lib test) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "d3dad313613de429c214fc97c57d5e14e893e000c57f839c8877cb108486080b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3dad313613de429c214fc97c57d5e14e893e000c57f839c8877cb108486080b", kill_on_drop: false }`
[INFO] [stdout] d3dad313613de429c214fc97c57d5e14e893e000c57f839c8877cb108486080b