[INFO] updating cached repository ConceptsDemo/rust-example
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ConceptsDemo/rust-example
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ConceptsDemo/rust-example" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/ConceptsDemo/rust-example"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/ConceptsDemo/rust-example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ConceptsDemo/rust-example" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/ConceptsDemo/rust-example"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/ConceptsDemo/rust-example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8d400f89e275040a5947640679df9a477d368595
[INFO] sha for GitHub repo ConceptsDemo/rust-example: 8d400f89e275040a5947640679df9a477d368595
[INFO] validating manifest of ConceptsDemo/rust-example on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ConceptsDemo/rust-example on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ConceptsDemo/rust-example
[INFO] finished frobbing ConceptsDemo/rust-example
[INFO] frobbed toml for ConceptsDemo/rust-example written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/ConceptsDemo/rust-example/Cargo.toml
[INFO] started frobbing ConceptsDemo/rust-example
[INFO] finished frobbing ConceptsDemo/rust-example
[INFO] frobbed toml for ConceptsDemo/rust-example written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/ConceptsDemo/rust-example/Cargo.toml
[INFO] crate ConceptsDemo/rust-example already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking ConceptsDemo/rust-example against master#0f88167f89fffe321590c5148f21b7d51d44388d for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-0/master#0f88167f89fffe321590c5148f21b7d51d44388d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/ConceptsDemo/rust-example:/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" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] edc8217769f5ce2680d2b439764b65aea204c85e30638aa4e1999f4b939dccd1
[INFO] running `"docker" "start" "-a" "edc8217769f5ce2680d2b439764b65aea204c85e30638aa4e1999f4b939dccd1"`
[INFO] [stderr]     Checking rust-example v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused imports: `f32`, `i16`, `i64`, `u16`, `u64`, `u8`, `usize`
[INFO] [stderr]  --> src/main.rs:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64, isize, usize};
[INFO] [stderr]   |               ^^^       ^^^  ^^  ^^^       ^^^  ^^^              ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `f32`, `i16`, `i64`, `u16`, `u64`, `u8`, `usize`
[INFO] [stderr]  --> src/main.rs:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64, isize, usize};
[INFO] [stderr]   |               ^^^       ^^^  ^^  ^^^       ^^^  ^^^              ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `age`
[INFO] [stderr]  --> src/main.rs:7:13
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut age : u32 = 100; 
[INFO] [stderr]   |             ^^^ help: consider prefixing with an underscore: `_age`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]   --> src/main.rs:64:6
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let count = rand_string.chars().count();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_count`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rand_tuple`
[INFO] [stderr]    --> src/main.rs:134:6
[INFO] [stderr]     |
[INFO] [stderr] 134 |     let rand_tuple = ("Vancir", 30);
[INFO] [stderr]     |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_rand_tuple`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `quicksilver`
[INFO] [stderr]    --> src/main.rs:172:6
[INFO] [stderr]     |
[INFO] [stderr] 172 |     let quicksilver = Hero::Fast;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: consider prefixing with an underscore: `_quicksilver`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `age`
[INFO] [stderr]  --> src/main.rs:7:13
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut age : u32 = 100; 
[INFO] [stderr]   |             ^^^ help: consider prefixing with an underscore: `_age`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]   --> src/main.rs:64:6
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let count = rand_string.chars().count();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_count`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rand_tuple`
[INFO] [stderr]    --> src/main.rs:134:6
[INFO] [stderr]     |
[INFO] [stderr] 134 |     let rand_tuple = ("Vancir", 30);
[INFO] [stderr]     |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_rand_tuple`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `quicksilver`
[INFO] [stderr]    --> src/main.rs:172:6
[INFO] [stderr]     |
[INFO] [stderr] 172 |     let quicksilver = Hero::Fast;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: consider prefixing with an underscore: `_quicksilver`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut age : u32 = 100; 
[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/main.rs:18:6
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut var = -4i32;
[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/main.rs:153:6
[INFO] [stderr]     |
[INFO] [stderr] 153 |     let mut circle1 = Circle {
[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/main.rs:166:6
[INFO] [stderr]     |
[INFO] [stderr] 166 |     let mut rect1 = Rectangle {
[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/main.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut age : u32 = 100; 
[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/main.rs:18:6
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut var = -4i32;
[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/main.rs:153:6
[INFO] [stderr]     |
[INFO] [stderr] 153 |     let mut circle1 = Circle {
[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/main.rs:166:6
[INFO] [stderr]     |
[INFO] [stderr] 166 |     let mut rect1 = Rectangle {
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `"docker" "inspect" "edc8217769f5ce2680d2b439764b65aea204c85e30638aa4e1999f4b939dccd1"`
[INFO] running `"docker" "rm" "-f" "edc8217769f5ce2680d2b439764b65aea204c85e30638aa4e1999f4b939dccd1"`
[INFO] [stdout] edc8217769f5ce2680d2b439764b65aea204c85e30638aa4e1999f4b939dccd1