[INFO] cloning repository https://github.com/AttaphatChana/apal-spectral-sparsification
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AttaphatChana/apal-spectral-sparsification" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAttaphatChana%2Fapal-spectral-sparsification", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAttaphatChana%2Fapal-spectral-sparsification'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2060291d7741fac52bd4ad279cbea076c3da6cba
[INFO] testing AttaphatChana/apal-spectral-sparsification against master#d98a5da813da67eb189387b8ccfb73cf481275d8+rustflags=-Copt-level=3 for pr-138759
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAttaphatChana%2Fapal-spectral-sparsification" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/AttaphatChana/apal-spectral-sparsification
[INFO] finished tweaking git repo https://github.com/AttaphatChana/apal-spectral-sparsification
[INFO] tweaked toml for git repo https://github.com/AttaphatChana/apal-spectral-sparsification written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/AttaphatChana/apal-spectral-sparsification on toolchain d98a5da813da67eb189387b8ccfb73cf481275d8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/AttaphatChana/apal-spectral-sparsification 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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded simba v0.9.0
[INFO] [stderr]   Downloaded nalgebra-sparse v0.10.0
[INFO] [stderr]   Downloaded nalgebra v0.33.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c719700ab42acd9b41d421da037aa5f2fe73532758f36ed311c72cd944a4141
[INFO] running `Command { std: "docker" "start" "-a" "8c719700ab42acd9b41d421da037aa5f2fe73532758f36ed311c72cd944a4141", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c719700ab42acd9b41d421da037aa5f2fe73532758f36ed311c72cd944a4141", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c719700ab42acd9b41d421da037aa5f2fe73532758f36ed311c72cd944a4141", kill_on_drop: false }`
[INFO] [stdout] 8c719700ab42acd9b41d421da037aa5f2fe73532758f36ed311c72cd944a4141
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Copt-level=3" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a71d6d927baa759980e14c7eaeeb14527e8e8a7cb68688eea228e1535b794a72
[INFO] running `Command { std: "docker" "start" "-a" "a71d6d927baa759980e14c7eaeeb14527e8e8a7cb68688eea228e1535b794a72", kill_on_drop: false }`
[INFO] [stderr]    Compiling bytemuck v1.22.0
[INFO] [stderr]    Compiling matrixmultiply v0.3.9
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling quote v1.0.39
[INFO] [stderr]    Compiling approx v0.5.1
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling safe_arch v0.7.4
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]    Compiling wide v0.7.32
[INFO] [stderr]    Compiling simba v0.9.0
[INFO] [stderr]    Compiling nalgebra-macros v0.2.2
[INFO] [stderr]    Compiling nalgebra v0.33.2
[INFO] [stderr]    Compiling nalgebra-sparse v0.10.0
[INFO] [stderr]    Compiling Laplacian v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:48:47
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn approx_rf(coo:&CooMatrix<i32>, n:usize) -> CooMatrix<f64> {
[INFO] [stdout]    |    ---------                                  ^^^^^^^^^^^^^^ expected `CooMatrix<f64>`, found `()`
[INFO] [stdout]    |    |
[INFO] [stdout]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `CooMatrix<f64>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let mut adj_matrix = CscMatrix::from(coo);
[INFO] [stdout]    |         ----^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut degree_matrix:CscMatrix<i32> = CscMatrix::from(&degree_matrix);
[INFO] [stdout]    |         ----^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `coo` is never read
[INFO] [stdout]   --> src/main.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut coo = CooMatrix::new(4, 4);
[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] warning: unused variable: `csr`
[INFO] [stdout]   --> src/main.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let csr = CsrMatrix::from(&coo);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_csr`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `csc`
[INFO] [stdout]   --> src/main.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |     let csc = CscMatrix::from(&coo);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_csc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `Laplacian` (bin "Laplacian") due to 1 previous error; 5 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a71d6d927baa759980e14c7eaeeb14527e8e8a7cb68688eea228e1535b794a72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a71d6d927baa759980e14c7eaeeb14527e8e8a7cb68688eea228e1535b794a72", kill_on_drop: false }`
[INFO] [stdout] a71d6d927baa759980e14c7eaeeb14527e8e8a7cb68688eea228e1535b794a72
