[INFO] cloning repository https://github.com/kdnk/rust_introduction
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kdnk/rust_introduction" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkdnk%2Frust_introduction", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkdnk%2Frust_introduction'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4a644f9533c899940a70df93d978e23509f90120
[INFO] checking kdnk/rust_introduction against master#8f08b3a32478b8d0507732800ecb548a76e0fd0c for pr-144157
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkdnk%2Frust_introduction" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kdnk/rust_introduction
[INFO] finished tweaking git repo https://github.com/kdnk/rust_introduction
[INFO] tweaked toml for git repo https://github.com/kdnk/rust_introduction written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kdnk/rust_introduction on toolchain 8f08b3a32478b8d0507732800ecb548a76e0fd0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f08b3a32478b8d0507732800ecb548a76e0fd0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kdnk/rust_introduction 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" "+8f08b3a32478b8d0507732800ecb548a76e0fd0c" "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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+8f08b3a32478b8d0507732800ecb548a76e0fd0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 235e9b48ba577fd87b728310dff109b325eb34f429acc8fe3a0432a2cf2f9053
[INFO] running `Command { std: "docker" "start" "-a" "235e9b48ba577fd87b728310dff109b325eb34f429acc8fe3a0432a2cf2f9053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "235e9b48ba577fd87b728310dff109b325eb34f429acc8fe3a0432a2cf2f9053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "235e9b48ba577fd87b728310dff109b325eb34f429acc8fe3a0432a2cf2f9053", kill_on_drop: false }`
[INFO] [stdout] 235e9b48ba577fd87b728310dff109b325eb34f429acc8fe3a0432a2cf2f9053
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+8f08b3a32478b8d0507732800ecb548a76e0fd0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c86ddc9a1070ceb4c6a8dbef329aa26828432a67f06e1f84c6a89c722ee2071
[INFO] running `Command { std: "docker" "start" "-a" "0c86ddc9a1070ceb4c6a8dbef329aa26828432a67f06e1f84c6a89c722ee2071", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_introduction v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: couldn't read `src/07_ownership/02_value_scope.rs`: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't read `src/07_ownership/03_copy.rs`: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't read `src/07_ownership/04_borrow.rs`: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't read `src/07_ownership/toy_vec.rs`: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_introduction` (bin "copy") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: couldn't read `src/07_ownership/04_borrow.rs`: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_introduction` (bin "toy_vec") due to 1 previous error
[INFO] [stderr] error: could not compile `rust_introduction` (bin "value_scope") due to 1 previous error
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/08_trait/03_dispatch.rs:8:34
[INFO] [stdout]   |
[INFO] [stdout] 8 |     <i32 as ToString>::to_string(t)
[INFO] [stdout]   |     ---------------------------- ^ expected `&i32`, found `i32`
[INFO] [stdout]   |     |
[INFO] [stdout]   |     arguments to this function are incorrect
[INFO] [stdout]   |
[INFO] [stdout] note: method defined here
[INFO] [stdout]  --> /rustc/8f08b3a32478b8d0507732800ecb548a76e0fd0c/library/alloc/src/string.rs:2795:8
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]   |
[INFO] [stdout] 8 |     <i32 as ToString>::to_string(&t)
[INFO] [stdout]   |                                  +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_introduction` (bin "borrow" test) due to 1 previous error
[INFO] [stderr] error: could not compile `rust_introduction` (bin "borrow") due to 1 previous error
[INFO] [stdout] warning: value passed to `n` is never read
[INFO] [stdout]  --> src/04_primitive/scalar.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn f1(mut n: u32) {
[INFO] [stdout]   |           ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/08_trait/03_dispatch.rs:8:34
[INFO] [stdout]   |
[INFO] [stdout] 8 |     <i32 as ToString>::to_string(t)
[INFO] [stdout]   |     ---------------------------- ^ expected `&i32`, found `i32`
[INFO] [stdout]   |     |
[INFO] [stdout]   |     arguments to this function are incorrect
[INFO] [stdout]   |
[INFO] [stdout] note: method defined here
[INFO] [stdout]  --> /rustc/8f08b3a32478b8d0507732800ecb548a76e0fd0c/library/alloc/src/string.rs:2795:8
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]   |
[INFO] [stdout] 8 |     <i32 as ToString>::to_string(&t)
[INFO] [stdout]   |                                  +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let data = Box::init("foo");
[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/08_trait/02_trait_generics.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let data = Box::<f32>::init(0.1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let data: Box<f32> = Init::init(0.1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `one_u32`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let one_u32: u32 = 1.cast();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_one_u32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `one_u32`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let one_u32: u64 = 1.cast();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_one_u32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let data = Box::init("foo");
[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/08_trait/02_trait_generics.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let data = Box::<f32>::init(0.1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let data: Box<f32> = Init::init(0.1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `one_u32`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let one_u32: u32 = 1.cast();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_one_u32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `one_u32`
[INFO] [stdout]   --> src/08_trait/02_trait_generics.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let one_u32: u64 = 1.cast();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_one_u32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_introduction` (bin "dispatch") due to 1 previous error
[INFO] [stderr] error: could not compile `rust_introduction` (bin "dispatch" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "0c86ddc9a1070ceb4c6a8dbef329aa26828432a67f06e1f84c6a89c722ee2071", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c86ddc9a1070ceb4c6a8dbef329aa26828432a67f06e1f84c6a89c722ee2071", kill_on_drop: false }`
[INFO] [stdout] 0c86ddc9a1070ceb4c6a8dbef329aa26828432a67f06e1f84c6a89c722ee2071