[INFO] updating cached repository cdouglass/samara
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cdouglass/samara
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cdouglass/samara" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/cdouglass/samara"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/cdouglass/samara'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cdouglass/samara" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/cdouglass/samara"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/cdouglass/samara'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 892b95e8db28cb5e51b578700822422092b2909f
[INFO] sha for GitHub repo cdouglass/samara: 892b95e8db28cb5e51b578700822422092b2909f
[INFO] validating manifest of cdouglass/samara on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cdouglass/samara on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cdouglass/samara
[INFO] finished frobbing cdouglass/samara
[INFO] frobbed toml for cdouglass/samara written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/cdouglass/samara/Cargo.toml
[INFO] started frobbing cdouglass/samara
[INFO] finished frobbing cdouglass/samara
[INFO] frobbed toml for cdouglass/samara written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/cdouglass/samara/Cargo.toml
[INFO] crate cdouglass/samara already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking cdouglass/samara against master#e305df1846a6d985315917ae0c81b74af8b4e641 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-4/master#e305df1846a6d985315917ae0c81b74af8b4e641:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/cdouglass/samara:/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=forbid" "-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" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 6dc396f5dde84873ae5aace5e7b4932e8ecc8ab9b6cc591c39a570e76393201f
[INFO] running `"docker" "start" "-a" "6dc396f5dde84873ae5aace5e7b4932e8ecc8ab9b6cc591c39a570e76393201f"`
[INFO] [stderr]    Compiling pulldown-cmark v0.1.0
[INFO] [stderr]    Compiling libc v0.2.31
[INFO] [stderr]    Compiling serde v1.0.15
[INFO] [stderr]    Compiling error-chain v0.11.0
[INFO] [stderr]     Checking bytecount v0.2.0
[INFO] [stderr]     Checking tempdir v0.3.5
[INFO] [stderr]     Checking skeptic v0.13.0
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling serde_json v1.0.3
[INFO] [stderr]    Compiling toml v0.4.5
[INFO] [stderr]    Compiling samara v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/structures/patterns.rs:46:46
[INFO] [stderr]    |
[INFO] [stderr] 46 |                   patterns.iter().fold(vec![], (|mut v, pat| {
[INFO] [stderr]    |  ______________________________________________^
[INFO] [stderr] 47 | |                     v.extend(pat.identifiers());
[INFO] [stderr] 48 | |                     v}))
[INFO] [stderr]    | |_______________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 patterns.iter().fold(vec![], |mut v, pat| {
[INFO] [stderr] 47 |                     v.extend(pat.identifiers());
[INFO] [stderr] 48 |                     v})
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/structures/patterns.rs:46:46
[INFO] [stderr]    |
[INFO] [stderr] 46 |                   patterns.iter().fold(vec![], (|mut v, pat| {
[INFO] [stderr]    |  ______________________________________________^
[INFO] [stderr] 47 | |                     v.extend(pat.identifiers());
[INFO] [stderr] 48 | |                     v}))
[INFO] [stderr]    | |_______________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 patterns.iter().fold(vec![], |mut v, pat| {
[INFO] [stderr] 47 |                     v.extend(pat.identifiers());
[INFO] [stderr] 48 |                     v})
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/parse/decl.rs:199:67
[INFO] [stderr]     |
[INFO] [stderr] 199 |         assert_parses_type("Int -> Bool -> Int", arrow(Type::Int, (arrow(Type::Bool, Type::Int))));
[INFO] [stderr]     |                                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:14:38
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn assert_evaluation_err(expr: &str, mut bindings: &mut Vec<LetBinding>, mut gen: &mut GenTypeVar, msg: &str) {
[INFO] [stderr]    |                                      ----^^^^^^^^
[INFO] [stderr]    |                                      |
[INFO] [stderr]    |                                      help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:14:74
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn assert_evaluation_err(expr: &str, mut bindings: &mut Vec<LetBinding>, mut gen: &mut GenTypeVar, msg: &str) {
[INFO] [stderr]    |                                                                          ----^^^
[INFO] [stderr]    |                                                                          |
[INFO] [stderr]    |                                                                          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:24:90
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn assert_evaluates_to_atom_with_context(expr: &str, mut bindings: &mut Vec<LetBinding>, mut gen: &mut GenTypeVar, sum_types: &SumTypeDefs, expected: Atom) {
[INFO] [stderr]    |                                                                                          ----^^^
[INFO] [stderr]    |                                                                                          |
[INFO] [stderr]    |                                                                                          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:34:41
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn assert_evaluates_to_atom(expr: &str, mut bindings: &mut Vec<LetBinding>, mut gen: &mut GenTypeVar, expected: Atom) {
[INFO] [stderr]    |                                         ----^^^^^^^^
[INFO] [stderr]    |                                         |
[INFO] [stderr]    |                                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:34:77
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn assert_evaluates_to_atom(expr: &str, mut bindings: &mut Vec<LetBinding>, mut gen: &mut GenTypeVar, expected: Atom) {
[INFO] [stderr]    |                                                                             ----^^^
[INFO] [stderr]    |                                                                             |
[INFO] [stderr]    |                                                                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.56s
[INFO] running `"docker" "inspect" "6dc396f5dde84873ae5aace5e7b4932e8ecc8ab9b6cc591c39a570e76393201f"`
[INFO] running `"docker" "rm" "-f" "6dc396f5dde84873ae5aace5e7b4932e8ecc8ab9b6cc591c39a570e76393201f"`
[INFO] [stdout] 6dc396f5dde84873ae5aace5e7b4932e8ecc8ab9b6cc591c39a570e76393201f