[INFO] crate descent 0.3.0 is already in cache
[INFO] extracting crate descent 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/descent/0.3.0
[INFO] extracting crate descent 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/descent/0.3.0
[INFO] validating manifest of descent-0.3.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of descent-0.3.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing descent-0.3.0
[INFO] finished frobbing descent-0.3.0
[INFO] frobbed toml for descent-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/descent/0.3.0/Cargo.toml
[INFO] started frobbing descent-0.3.0
[INFO] finished frobbing descent-0.3.0
[INFO] frobbed toml for descent-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/descent/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing descent-0.3.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/descent/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 6756349eb49e65692caab9639ccd889d0dcc2d489c0ff23991bc4f7865515e6c
[INFO] running `"docker" "start" "-a" "6756349eb49e65692caab9639ccd889d0dcc2d489c0ff23991bc4f7865515e6c"`
[INFO] [stderr]    Compiling descent v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(test)] // enable benchmarking
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Var` is imported redundantly
[INFO] [stderr]    --> src/expr/dynam.rs:385:13
[INFO] [stderr]     |
[INFO] [stderr] 32  | use super::{Column, Expression, Par, Retrieve, Var, ID};
[INFO] [stderr]     |                                                --- the item `Var` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 385 |         use self::Var;
[INFO] [stderr]     |             ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Par` is imported redundantly
[INFO] [stderr]    --> src/expr/dynam.rs:581:20
[INFO] [stderr]     |
[INFO] [stderr] 32  | use super::{Column, Expression, Par, Retrieve, Var, ID};
[INFO] [stderr]     |                                 --- the item `Par` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 581 |         use self::{Par, Var};
[INFO] [stderr]     |                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Var` is imported redundantly
[INFO] [stderr]    --> src/expr/dynam.rs:581:25
[INFO] [stderr]     |
[INFO] [stderr] 32  | use super::{Column, Expression, Par, Retrieve, Var, ID};
[INFO] [stderr]     |                                                --- the item `Var` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 581 |         use self::{Par, Var};
[INFO] [stderr]     |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Var` is imported redundantly
[INFO] [stderr]    --> src/expr/dynam.rs:830:13
[INFO] [stderr]     |
[INFO] [stderr] 32  | use super::{Column, Expression, Par, Retrieve, Var, ID};
[INFO] [stderr]     |                                                --- the item `Var` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 830 |         use self::Var;
[INFO] [stderr]     |             ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/expr/fixed.rs:63:16
[INFO] [stderr]    |
[INFO] [stderr] 63 |     pub f: Box<Fn(&[f64], &[f64]) -> f64>,
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&[f64], &[f64]) -> f64`
[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/expr/fixed.rs:67:18
[INFO] [stderr]    |
[INFO] [stderr] 67 |     pub all: Box<Fn(&[f64], &[f64], &mut [f64], &mut [f64]) -> f64>,
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&[f64], &[f64], &mut [f64], &mut [f64]) -> f64`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/expr.rs:98:42
[INFO] [stderr]    |
[INFO] [stderr] 98 |     pub fn lin_iter<'a>(&'a self) -> Box<Iterator<Item = ID> + 'a> {
[INFO] [stderr]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = ID> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/expr.rs:113:43
[INFO] [stderr]     |
[INFO] [stderr] 113 |     pub fn nlin_iter<'a>(&'a self) -> Box<Iterator<Item = ID> + 'a> {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = ID> + 'a`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `descent`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6756349eb49e65692caab9639ccd889d0dcc2d489c0ff23991bc4f7865515e6c"`
[INFO] running `"docker" "rm" "-f" "6756349eb49e65692caab9639ccd889d0dcc2d489c0ff23991bc4f7865515e6c"`
[INFO] [stdout] 6756349eb49e65692caab9639ccd889d0dcc2d489c0ff23991bc4f7865515e6c