[INFO] updating cached repository https://github.com/khernyo/qc-playground
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3877fdb35e4285a6bc1a85534f3b0eb1fecc2dd7
[INFO] testing khernyo/qc-playground against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhernyo%2Fqc-playground" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/khernyo/qc-playground on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/khernyo/qc-playground
[INFO] finished tweaking git repo https://github.com/khernyo/qc-playground
[INFO] tweaked toml for git repo https://github.com/khernyo/qc-playground written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/khernyo/qc-playground already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] cf1c6af6e3a6f6a29b2114f2b181bbd94c7bd16395a4f527bb2fb1189e48eaae
[INFO] running `"docker" "start" "-a" "cf1c6af6e3a6f6a29b2114f2b181bbd94c7bd16395a4f527bb2fb1189e48eaae"`
[INFO] [stderr]    Compiling generic-array v0.8.3
[INFO] [stderr]    Compiling alga v0.5.4
[INFO] [stderr]    Compiling nalgebra v0.14.4
[INFO] [stderr] warning[E0502]: cannot borrow `*self` as immutable because it is also borrowed as mutable
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/nalgebra-0.14.4/src/core/cg.rs:292:44
[INFO] [stderr]     |
[INFO] [stderr] 292 |                 self[(j, i)] += shift[j] * self[(D::dim() - 1, i)];
[INFO] [stderr]     |                 ---------------------------^^^^-------------------
[INFO] [stderr]     |                 |                          |
[INFO] [stderr]     |                 |                          immutable borrow occurs here
[INFO] [stderr]     |                 mutable borrow occurs here
[INFO] [stderr]     |                 mutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]    Compiling qc-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `approx::ApproxEq`
[INFO] [stderr]   --> src/lib.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use approx::ApproxEq;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:217:32
[INFO] [stderr]     |
[INFO] [stderr] 217 |     fn measure(self, rng: &mut Rng) -> Vec<bool> {
[INFO] [stderr]     |                                ^^^ help: use `dyn`: `dyn Rng`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:231:48
[INFO] [stderr]     |
[INFO] [stderr] 231 |     fn measure_one(self, index: u32, rng: &mut Rng) -> (bool, QState) {
[INFO] [stderr]     |                                                ^^^ help: use `dyn`: `dyn Rng`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from_qubits`
[INFO] [stderr]    --> src/lib.rs:112:5
[INFO] [stderr]     |
[INFO] [stderr] 112 |     fn from_qubits(qubits: &[Qubit]) -> QStateExpr {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `eval`
[INFO] [stderr]    --> src/lib.rs:125:5
[INFO] [stderr]     |
[INFO] [stderr] 125 |     fn eval(self) -> QState {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `QState`
[INFO] [stderr]    --> src/lib.rs:176:1
[INFO] [stderr]     |
[INFO] [stderr] 176 | struct QState {
[INFO] [stderr]     | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from`
[INFO] [stderr]    --> src/lib.rs:187:5
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn from(expr: QStateExpr) -> QState {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `validate`
[INFO] [stderr]    --> src/lib.rs:193:5
[INFO] [stderr]     |
[INFO] [stderr] 193 |     fn validate(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `qubit_count`
[INFO] [stderr]    --> src/lib.rs:201:5
[INFO] [stderr]     |
[INFO] [stderr] 201 |     fn qubit_count(&self) -> u32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `apply`
[INFO] [stderr]    --> src/lib.rs:205:5
[INFO] [stderr]     |
[INFO] [stderr] 205 |     fn apply(self, gate: &QGate) -> QState {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `measure`
[INFO] [stderr]    --> src/lib.rs:217:5
[INFO] [stderr]     |
[INFO] [stderr] 217 |     fn measure(self, rng: &mut Rng) -> Vec<bool> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `measure_one`
[INFO] [stderr]    --> src/lib.rs:231:5
[INFO] [stderr]     |
[INFO] [stderr] 231 |     fn measure_one(self, index: u32, rng: &mut Rng) -> (bool, QState) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `n_to_bitvec`
[INFO] [stderr]    --> src/lib.rs:236:1
[INFO] [stderr]     |
[INFO] [stderr] 236 | fn n_to_bitvec(n: usize, bits: u32) -> Vec<bool> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `qubit_count`
[INFO] [stderr]    --> src/lib.rs:247:1
[INFO] [stderr]     |
[INFO] [stderr] 247 | fn qubit_count(state: &DVector<Complex64>) -> u32 {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `QGate`
[INFO] [stderr]    --> src/lib.rs:252:1
[INFO] [stderr]     |
[INFO] [stderr] 252 | struct QGate(DMatrix<Complex64>);
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `identity`
[INFO] [stderr]    --> src/lib.rs:261:5
[INFO] [stderr]     |
[INFO] [stderr] 261 |     fn identity() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `hadamard`
[INFO] [stderr]    --> src/lib.rs:271:5
[INFO] [stderr]     |
[INFO] [stderr] 271 |     fn hadamard() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pauli_x`
[INFO] [stderr]    --> src/lib.rs:279:5
[INFO] [stderr]     |
[INFO] [stderr] 279 |     fn pauli_x() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pauli_y`
[INFO] [stderr]    --> src/lib.rs:286:5
[INFO] [stderr]     |
[INFO] [stderr] 286 |     fn pauli_y() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pauli_z`
[INFO] [stderr]    --> src/lib.rs:293:5
[INFO] [stderr]     |
[INFO] [stderr] 293 |     fn pauli_z() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `phase_shift`
[INFO] [stderr]    --> src/lib.rs:300:5
[INFO] [stderr]     |
[INFO] [stderr] 300 |     fn phase_shift(phi: f64) -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `swap`
[INFO] [stderr]    --> src/lib.rs:307:5
[INFO] [stderr]     |
[INFO] [stderr] 307 |     fn swap() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `cnot`
[INFO] [stderr]    --> src/lib.rs:316:5
[INFO] [stderr]     |
[INFO] [stderr] 316 |     fn cnot() -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `par`
[INFO] [stderr]    --> src/lib.rs:326:5
[INFO] [stderr]     |
[INFO] [stderr] 326 |     fn par(&self, rhs: &QGate) -> QGate {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.35s
[INFO] running `"docker" "inspect" "cf1c6af6e3a6f6a29b2114f2b181bbd94c7bd16395a4f527bb2fb1189e48eaae"`
[INFO] running `"docker" "rm" "-f" "cf1c6af6e3a6f6a29b2114f2b181bbd94c7bd16395a4f527bb2fb1189e48eaae"`
[INFO] [stdout] cf1c6af6e3a6f6a29b2114f2b181bbd94c7bd16395a4f527bb2fb1189e48eaae
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 656ce486252628069fbe3563a0549302c86c798d4b4b30b9030ad88281c2c2e7
[INFO] running `"docker" "start" "-a" "656ce486252628069fbe3563a0549302c86c798d4b4b30b9030ad88281c2c2e7"`
[INFO] [stderr]    Compiling rustc-cfg v0.2.0
[INFO] [stderr]    Compiling ieee754 v0.2.6
[INFO] [stderr]    Compiling ramp v0.5.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.5.1/src/lib.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![feature(core_intrinsics, asm, allocator_api)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.5.1/src/lib.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![feature(step_trait, ptr_internals, alloc, raw_vec_internals)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `cap` found for type `alloc::raw_vec::RawVec<ll::limb::Limb>` in the current scope
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.5.1/src/int.rs:164:31
[INFO] [stderr]     |
[INFO] [stderr] 164 |             let new_cap = vec.cap();
[INFO] [stderr]     |                               ^^^ private field, not a method
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `ramp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "656ce486252628069fbe3563a0549302c86c798d4b4b30b9030ad88281c2c2e7"`
[INFO] running `"docker" "rm" "-f" "656ce486252628069fbe3563a0549302c86c798d4b4b30b9030ad88281c2c2e7"`
[INFO] [stdout] 656ce486252628069fbe3563a0549302c86c798d4b4b30b9030ad88281c2c2e7