[INFO] cloning repository cdouglass/samara
[INFO] running `"git" "clone" "--bare" "git://github.com/cdouglass/samara.git" "work/cache/sources/gh/cdouglass/samara"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/cdouglass/samara'...
[INFO] running `"git" "clone" "work/cache/sources/gh/cdouglass/samara" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/cdouglass/samara"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/cdouglass/samara'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cdouglass/samara" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/cdouglass/samara"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/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#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cdouglass/samara on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-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-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/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-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/cdouglass/samara/Cargo.toml
[INFO] crate cdouglass/samara has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking cdouglass/samara against master#c0086b9e8972fef9fd4af24bae20d45021ed06c6 for pr-58899
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58899/worker-4/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/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" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c8d03c369434d6ed0467dcf18e0326156bece7afbebdcd5bc09ecf29365a7e1b
[INFO] running `"docker" "start" "-a" "c8d03c369434d6ed0467dcf18e0326156bece7afbebdcd5bc09ecf29365a7e1b"`
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling pulldown-cmark v0.1.0
[INFO] [stderr]    Compiling bitflags v0.9.1
[INFO] [stderr]    Compiling getopts v0.2.15
[INFO] [stderr]    Compiling serde v1.0.15
[INFO] [stderr]    Compiling error-chain v0.11.0
[INFO] [stderr]    Compiling glob v0.2.11
[INFO] [stderr]     Checking bytecount v0.2.0
[INFO] [stderr]     Checking toml v0.4.5
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling tempdir v0.3.5
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling serde_derive_internals v0.16.0
[INFO] [stderr]    Compiling serde_derive v1.0.15
[INFO] [stderr]    Compiling serde_json v1.0.3
[INFO] [stderr]     Checking skeptic v0.13.0
[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 41.95s
[INFO] running `"docker" "inspect" "c8d03c369434d6ed0467dcf18e0326156bece7afbebdcd5bc09ecf29365a7e1b"`
[INFO] running `"docker" "rm" "-f" "c8d03c369434d6ed0467dcf18e0326156bece7afbebdcd5bc09ecf29365a7e1b"`
[INFO] [stdout] c8d03c369434d6ed0467dcf18e0326156bece7afbebdcd5bc09ecf29365a7e1b