[INFO] crate mexprp 0.3.0 is already in cache
[INFO] extracting crate mexprp 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/mexprp/0.3.0
[INFO] extracting crate mexprp 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mexprp/0.3.0
[INFO] validating manifest of mexprp-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 mexprp-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 mexprp-0.3.0
[INFO] finished frobbing mexprp-0.3.0
[INFO] frobbed toml for mexprp-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mexprp/0.3.0/Cargo.toml
[INFO] started frobbing mexprp-0.3.0
[INFO] finished frobbing mexprp-0.3.0
[INFO] frobbed toml for mexprp-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mexprp/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 mexprp-0.3.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mexprp/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 654faee728e77bd91d6b57b3daa761b769449a197b81efeae9d6536a35e6d754
[INFO] running `"docker" "start" "-a" "654faee728e77bd91d6b57b3daa761b769449a197b81efeae9d6536a35e6d754"`
[INFO] [stderr]    Compiling rug v1.5.2
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.1.14
[INFO] [stderr]    Compiling mexprp v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/expr.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `op::*`
[INFO] [stderr]  --> src/expr.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use op::*;
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `parse::*`
[INFO] [stderr]  --> src/expr.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use parse::*;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `answer::*`
[INFO] [stderr]   --> src/expr.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use answer::*;
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/term.rs:21:15
[INFO] [stderr]    |
[INFO] [stderr] 21 |     Operation(Rc<Operate<N>>),
[INFO] [stderr]    |                  ^^^^^^^^^^ help: use `dyn`: `dyn Operate<N>`
[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/term.rs:337:18
[INFO] [stderr]     |
[INFO] [stderr] 337 |                 let oper: Rc<Operate<N>> = match op {
[INFO] [stderr]     |                              ^^^^^^^^^^ help: use `dyn`: `dyn Operate<N>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/context.rs:97:32
[INFO] [stderr]    |
[INFO] [stderr] 97 |     pub funcs: HashMap<String, Rc<Func<N>>>,
[INFO] [stderr]    |                                   ^^^^^^^ help: use `dyn`: `dyn Func<N>`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rug`
[INFO] [stderr]  --> src/num/rugcomplex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rug;
[INFO] [stderr]   |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/opers.rs:215:17
[INFO] [stderr]     |
[INFO] [stderr] 215 |     fn eval(&self, ctx: &Context<N>) -> Calculation<N> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:73:19
[INFO] [stderr]    |
[INFO] [stderr] 73 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                      ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:73:33
[INFO] [stderr]    |
[INFO] [stderr] 73 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:79:16
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:79:30
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:85:16
[INFO] [stderr]    |
[INFO] [stderr] 85 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:85:30
[INFO] [stderr]    |
[INFO] [stderr] 85 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:91:16
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:91:30
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:97:16
[INFO] [stderr]    |
[INFO] [stderr] 97 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:97:30
[INFO] [stderr]    |
[INFO] [stderr] 97 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:103:16
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn pow(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:103:30
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn pow(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:109:17
[INFO] [stderr]     |
[INFO] [stderr] 109 |     fn sqrt(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:115:16
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn nrt(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:115:30
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn nrt(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:121:16
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn abs(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:127:16
[INFO] [stderr]     |
[INFO] [stderr] 127 |     fn sin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:133:16
[INFO] [stderr]     |
[INFO] [stderr] 133 |     fn cos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:139:16
[INFO] [stderr]     |
[INFO] [stderr] 139 |     fn tan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:145:17
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn asin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:151:17
[INFO] [stderr]     |
[INFO] [stderr] 151 |     fn acos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:157:17
[INFO] [stderr]     |
[INFO] [stderr] 157 |     fn atan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:163:18
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn atan2(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:163:32
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn atan2(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:169:18
[INFO] [stderr]     |
[INFO] [stderr] 169 |     fn floor(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:175:17
[INFO] [stderr]     |
[INFO] [stderr] 175 |     fn ceil(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |     fn round(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:187:16
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn log(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:187:30
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn log(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:22:22
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:35:42
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn from_f64_complex((r, i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                             ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:54:33
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:62:30
[INFO] [stderr]    |
[INFO] [stderr] 62 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:69:30
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:76:30
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:11:22
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:19:43
[INFO] [stderr]    |
[INFO] [stderr] 19 |     fn from_f64_complex((r, _i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                              ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:31:33
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:39:30
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:45:30
[INFO] [stderr]    |
[INFO] [stderr] 45 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:51:30
[INFO] [stderr]    |
[INFO] [stderr] 51 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:57:30
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugcomplex.rs:25:33
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:20:22
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:24:42
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn from_f64_complex((r, i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                             ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:32:33
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:40:30
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:47:30
[INFO] [stderr]    |
[INFO] [stderr] 47 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:54:30
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:11:22
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:15:43
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn from_f64_complex((r, _i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                              ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:49:30
[INFO] [stderr]    |
[INFO] [stderr] 49 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:53:30
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:57:30
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:61:30
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:69:30
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn pow(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:83:16
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn abs(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:87:16
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn sin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:91:16
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn cos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:95:16
[INFO] [stderr]    |
[INFO] [stderr] 95 |     fn tan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:99:17
[INFO] [stderr]    |
[INFO] [stderr] 99 |     fn asin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:103:17
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn acos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:107:17
[INFO] [stderr]     |
[INFO] [stderr] 107 |     fn atan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:111:32
[INFO] [stderr]     |
[INFO] [stderr] 111 |     fn atan2(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:115:18
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn floor(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:119:17
[INFO] [stderr]     |
[INFO] [stderr] 119 |     fn ceil(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:123:18
[INFO] [stderr]     |
[INFO] [stderr] 123 |     fn round(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:127:30
[INFO] [stderr]     |
[INFO] [stderr] 127 |     fn log(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Ceil`
[INFO] [stderr]    --> src/context.rs:435:2
[INFO] [stderr]     |
[INFO] [stderr] 435 |     pub struct Ceil;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 13s
[INFO] running `"docker" "inspect" "654faee728e77bd91d6b57b3daa761b769449a197b81efeae9d6536a35e6d754"`
[INFO] running `"docker" "rm" "-f" "654faee728e77bd91d6b57b3daa761b769449a197b81efeae9d6536a35e6d754"`
[INFO] [stdout] 654faee728e77bd91d6b57b3daa761b769449a197b81efeae9d6536a35e6d754
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mexprp/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 31d518f84f6e237224677b16b89b9f23f7050cdee0028068ca8162dc9ac2f990
[INFO] running `"docker" "start" "-a" "31d518f84f6e237224677b16b89b9f23f7050cdee0028068ca8162dc9ac2f990"`
[INFO] [stderr]    Compiling mexprp v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/expr.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `op::*`
[INFO] [stderr]  --> src/expr.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use op::*;
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `parse::*`
[INFO] [stderr]  --> src/expr.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use parse::*;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `answer::*`
[INFO] [stderr]   --> src/expr.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use answer::*;
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/term.rs:21:15
[INFO] [stderr]    |
[INFO] [stderr] 21 |     Operation(Rc<Operate<N>>),
[INFO] [stderr]    |                  ^^^^^^^^^^ help: use `dyn`: `dyn Operate<N>`
[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/term.rs:337:18
[INFO] [stderr]     |
[INFO] [stderr] 337 |                 let oper: Rc<Operate<N>> = match op {
[INFO] [stderr]     |                              ^^^^^^^^^^ help: use `dyn`: `dyn Operate<N>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/context.rs:97:32
[INFO] [stderr]    |
[INFO] [stderr] 97 |     pub funcs: HashMap<String, Rc<Func<N>>>,
[INFO] [stderr]    |                                   ^^^^^^^ help: use `dyn`: `dyn Func<N>`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rug`
[INFO] [stderr]  --> src/num/rugcomplex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rug;
[INFO] [stderr]   |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ComplexRugRat`
[INFO] [stderr]  --> src/tests.rs:2:25
[INFO] [stderr]   |
[INFO] [stderr] 2 | use num::{ComplexFloat, ComplexRugRat};
[INFO] [stderr]   |                         ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/opers.rs:215:17
[INFO] [stderr]     |
[INFO] [stderr] 215 |     fn eval(&self, ctx: &Context<N>) -> Calculation<N> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:73:19
[INFO] [stderr]    |
[INFO] [stderr] 73 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                      ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:73:33
[INFO] [stderr]    |
[INFO] [stderr] 73 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:79:16
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:79:30
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:85:16
[INFO] [stderr]    |
[INFO] [stderr] 85 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:85:30
[INFO] [stderr]    |
[INFO] [stderr] 85 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:91:16
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:91:30
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> src/num/mod.rs:97:16
[INFO] [stderr]    |
[INFO] [stderr] 97 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/mod.rs:97:30
[INFO] [stderr]    |
[INFO] [stderr] 97 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:103:16
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn pow(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:103:30
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn pow(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:109:17
[INFO] [stderr]     |
[INFO] [stderr] 109 |     fn sqrt(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:115:16
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn nrt(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:115:30
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn nrt(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:121:16
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn abs(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:127:16
[INFO] [stderr]     |
[INFO] [stderr] 127 |     fn sin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:133:16
[INFO] [stderr]     |
[INFO] [stderr] 133 |     fn cos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:139:16
[INFO] [stderr]     |
[INFO] [stderr] 139 |     fn tan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:145:17
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn asin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:151:17
[INFO] [stderr]     |
[INFO] [stderr] 151 |     fn acos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:157:17
[INFO] [stderr]     |
[INFO] [stderr] 157 |     fn atan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:163:18
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn atan2(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:163:32
[INFO] [stderr]     |
[INFO] [stderr] 163 |     fn atan2(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:169:18
[INFO] [stderr]     |
[INFO] [stderr] 169 |     fn floor(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:175:17
[INFO] [stderr]     |
[INFO] [stderr] 175 |     fn ceil(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |     fn round(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]    --> src/num/mod.rs:187:16
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn log(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                   ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/mod.rs:187:30
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn log(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:22:22
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:35:42
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn from_f64_complex((r, i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                             ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:54:33
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:62:30
[INFO] [stderr]    |
[INFO] [stderr] 62 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:69:30
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexrugrat.rs:76:30
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:11:22
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:19:43
[INFO] [stderr]    |
[INFO] [stderr] 19 |     fn from_f64_complex((r, _i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                              ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:31:33
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:39:30
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:45:30
[INFO] [stderr]    |
[INFO] [stderr] 45 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:51:30
[INFO] [stderr]    |
[INFO] [stderr] 51 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugrat.rs:57:30
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/rugcomplex.rs:25:33
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:20:22
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:24:42
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn from_f64_complex((r, i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                             ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:32:33
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn tryord(&self, other: &Self, ctx: &Context<Self>) -> Result<Ordering, MathError> {
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:40:30
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:47:30
[INFO] [stderr]    |
[INFO] [stderr] 47 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/complexfloat.rs:54:30
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:11:22
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn from_f64(t: f64, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                         ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:15:43
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn from_f64_complex((r, _i): (f64, f64), ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                              ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:49:30
[INFO] [stderr]    |
[INFO] [stderr] 49 |     fn add(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:53:30
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn sub(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:57:30
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn mul(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:61:30
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn div(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:69:30
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn pow(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:83:16
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn abs(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:87:16
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn sin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:91:16
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn cos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:95:16
[INFO] [stderr]    |
[INFO] [stderr] 95 |     fn tan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]   --> src/num/float64.rs:99:17
[INFO] [stderr]    |
[INFO] [stderr] 99 |     fn asin(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]    |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:103:17
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn acos(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:107:17
[INFO] [stderr]     |
[INFO] [stderr] 107 |     fn atan(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:111:32
[INFO] [stderr]     |
[INFO] [stderr] 111 |     fn atan2(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                   ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:115:18
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn floor(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:119:17
[INFO] [stderr]     |
[INFO] [stderr] 119 |     fn ceil(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                    ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:123:18
[INFO] [stderr]     |
[INFO] [stderr] 123 |     fn round(&self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ctx`
[INFO] [stderr]    --> src/num/float64.rs:127:30
[INFO] [stderr]     |
[INFO] [stderr] 127 |     fn log(&self, other: &Self, ctx: &Context<Self>) -> Calculation<Self> {
[INFO] [stderr]     |                                 ^^^ help: consider prefixing with an underscore: `_ctx`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Ceil`
[INFO] [stderr]    --> src/context.rs:435:2
[INFO] [stderr]     |
[INFO] [stderr] 435 |     pub struct Ceil;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.93s
[INFO] running `"docker" "inspect" "31d518f84f6e237224677b16b89b9f23f7050cdee0028068ca8162dc9ac2f990"`
[INFO] running `"docker" "rm" "-f" "31d518f84f6e237224677b16b89b9f23f7050cdee0028068ca8162dc9ac2f990"`
[INFO] [stdout] 31d518f84f6e237224677b16b89b9f23f7050cdee0028068ca8162dc9ac2f990
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mexprp/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 4e634e58414b55fc634f6d5173e51f09242e841af159e199f2532b505bc2c5bf
[INFO] running `"docker" "start" "-a" "4e634e58414b55fc634f6d5173e51f09242e841af159e199f2532b505bc2c5bf"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mexprp-03828a3140fd7626
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test tests::expr_context ... ok
[INFO] [stdout] test tests::basic ... ok
[INFO] [stdout] test tests::var_context ... ok
[INFO] [stdout] test tests::plain ... ok
[INFO] [stdout] test tests::funcs ... ok
[INFO] [stdout] test tests::sin ... ok
[INFO] [stdout] test tests::funky ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mexprp
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test src/lib.rs -  (line 90) ... ok
[INFO] [stdout] test src/lib.rs -  (line 99) ... ok
[INFO] [stdout] test src/context.rs - context::Context (line 25) ... ok
[INFO] [stdout] test src/lib.rs -  (line 27) ... ok
[INFO] [stdout] test src/context.rs - context::Context (line 40) ... ok
[INFO] [stdout] test src/lib.rs -  (line 52) ... ok
[INFO] [stdout] test src/lib.rs -  (line 40) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "4e634e58414b55fc634f6d5173e51f09242e841af159e199f2532b505bc2c5bf"`
[INFO] running `"docker" "rm" "-f" "4e634e58414b55fc634f6d5173e51f09242e841af159e199f2532b505bc2c5bf"`
[INFO] [stdout] 4e634e58414b55fc634f6d5173e51f09242e841af159e199f2532b505bc2c5bf