[INFO] cloning repository https://github.com/P1start/753
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/P1start/753" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FP1start%2F753", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FP1start%2F753'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a8665b11724bba0bed27fdabecefe850480d4f85
[INFO] testing P1start/753 against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FP1start%2F753" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/P1start/753 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/P1start/753
[INFO] finished tweaking git repo https://github.com/P1start/753
[INFO] tweaked toml for git repo https://github.com/P1start/753 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/P1start/753 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 575cef9506c6caaa23e00af8db941688b65f8db4899fe6973992d26a768cbd96
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "575cef9506c6caaa23e00af8db941688b65f8db4899fe6973992d26a768cbd96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "575cef9506c6caaa23e00af8db941688b65f8db4899fe6973992d26a768cbd96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "575cef9506c6caaa23e00af8db941688b65f8db4899fe6973992d26a768cbd96", kill_on_drop: false }`
[INFO] [stdout] 575cef9506c6caaa23e00af8db941688b65f8db4899fe6973992d26a768cbd96
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b5232bafb52342bcf8a72aa4ced046d3d3856bb0a2a8fc64986c4c2fd5c8d41a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b5232bafb52342bcf8a72aa4ced046d3d3856bb0a2a8fc64986c4c2fd5c8d41a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.34
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling rand v0.4.1
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling regex v0.2.3
[INFO] [stderr]    Compiling llvm-sys v40.0.5
[INFO] [stderr]    Compiling _753 v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/parse.rs:136:17
[INFO] [stdout]     |
[INFO] [stdout] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stdout]     |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/parse.rs:136:31
[INFO] [stdout]     |
[INFO] [stdout] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stdout]     |                               ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/parse.rs:136:45
[INFO] [stdout]     |
[INFO] [stdout] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stdout]     |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/llvm.rs:163:13
[INFO] [stdout]     |
[INFO] [stdout] 163 |             try!(write!(f, "{}", c_str.to_str().unwrap()));
[INFO] [stdout]     |             ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> src/llvm.rs:138:26
[INFO] [stdout]     |
[INFO] [stdout] 138 |             let mut ee = mem::uninitialized();
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> src/llvm.rs:304:34
[INFO] [stdout]     |
[INFO] [stdout] 304 |             let mut out_module = mem::uninitialized();
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/compile.rs:321:25
[INFO] [stdout]     |
[INFO] [stdout] 321 |                     let mut new_mir = MirBuilder::new(new_name, expr);
[INFO] [stdout]     |                         ----^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/compile.rs:408:21
[INFO] [stdout]     |
[INFO] [stdout] 408 |                 let mut predecessors = mir.bbs.iter().enumerate().filter_map(|(i, x)| match x.terminator {
[INFO] [stdout]     |                     ----^^^^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.47s
[INFO] running `Command { std: "docker" "inspect" "b5232bafb52342bcf8a72aa4ced046d3d3856bb0a2a8fc64986c4c2fd5c8d41a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5232bafb52342bcf8a72aa4ced046d3d3856bb0a2a8fc64986c4c2fd5c8d41a", kill_on_drop: false }`
[INFO] [stdout] b5232bafb52342bcf8a72aa4ced046d3d3856bb0a2a8fc64986c4c2fd5c8d41a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3b817ca5f6105cdfe3f2b7209bf8c1a4a04d024e04ec1cf3decfa79f469153e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c3b817ca5f6105cdfe3f2b7209bf8c1a4a04d024e04ec1cf3decfa79f469153e", kill_on_drop: false }`
[INFO] [stderr]    Compiling _753 v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/parse.rs:136:17
[INFO] [stdout]     |
[INFO] [stdout] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stdout]     |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/parse.rs:136:31
[INFO] [stdout]     |
[INFO] [stdout] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stdout]     |                               ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/parse.rs:136:45
[INFO] [stdout]     |
[INFO] [stdout] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stdout]     |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/llvm.rs:163:13
[INFO] [stdout]     |
[INFO] [stdout] 163 |             try!(write!(f, "{}", c_str.to_str().unwrap()));
[INFO] [stdout]     |             ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> src/llvm.rs:138:26
[INFO] [stdout]     |
[INFO] [stdout] 138 |             let mut ee = mem::uninitialized();
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> src/llvm.rs:304:34
[INFO] [stdout]     |
[INFO] [stdout] 304 |             let mut out_module = mem::uninitialized();
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/compile.rs:321:25
[INFO] [stdout]     |
[INFO] [stdout] 321 |                     let mut new_mir = MirBuilder::new(new_name, expr);
[INFO] [stdout]     |                         ----^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/compile.rs:408:21
[INFO] [stdout]     |
[INFO] [stdout] 408 |                 let mut predecessors = mir.bbs.iter().enumerate().filter_map(|(i, x)| match x.terminator {
[INFO] [stdout]     |                     ----^^^^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 5.79s
[INFO] running `Command { std: "docker" "inspect" "c3b817ca5f6105cdfe3f2b7209bf8c1a4a04d024e04ec1cf3decfa79f469153e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3b817ca5f6105cdfe3f2b7209bf8c1a4a04d024e04ec1cf3decfa79f469153e", kill_on_drop: false }`
[INFO] [stdout] c3b817ca5f6105cdfe3f2b7209bf8c1a4a04d024e04ec1cf3decfa79f469153e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] cca88ca2e5ff2ab2f19814a032f3b111945cc5427e2a5144826e7a214f91f8d2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cca88ca2e5ff2ab2f19814a032f3b111945cc5427e2a5144826e7a214f91f8d2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/parse.rs:136:17
[INFO] [stderr]     |
[INFO] [stderr] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stderr]     |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/parse.rs:136:31
[INFO] [stderr]     |
[INFO] [stderr] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stderr]     |                               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/parse.rs:136:45
[INFO] [stderr]     |
[INFO] [stderr] 136 |             '0' ... '9' | 'a' ... 'z' | 'A' ... 'Z' | '-' | '_' => true,
[INFO] [stderr]     |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stderr]    --> src/llvm.rs:163:13
[INFO] [stderr]     |
[INFO] [stderr] 163 |             try!(write!(f, "{}", c_str.to_str().unwrap()));
[INFO] [stderr]     |             ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stderr]    --> src/llvm.rs:138:26
[INFO] [stderr]     |
[INFO] [stderr] 138 |             let mut ee = mem::uninitialized();
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stderr]    --> src/llvm.rs:304:34
[INFO] [stderr]     |
[INFO] [stderr] 304 |             let mut out_module = mem::uninitialized();
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/compile.rs:321:25
[INFO] [stderr]     |
[INFO] [stderr] 321 |                     let mut new_mir = MirBuilder::new(new_name, expr);
[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/compile.rs:408:21
[INFO] [stderr]     |
[INFO] [stderr] 408 |                 let mut predecessors = mir.bbs.iter().enumerate().filter_map(|(i, x)| match x.terminator {
[INFO] [stderr]     |                     ----^^^^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/_753-0c4494a3ea16c3b6)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test parse::test::test_parser_matching_parentheses ... ok
[INFO] [stdout] test parse::test::test_parser_matching_square_brackets ... ok
[INFO] [stdout] test parse::test::test_unmatched_brackets2 ... ok
[INFO] [stdout] test parse::test::test_unmatched_brackets1 ... ok
[INFO] [stderr] error: test failed, to rerun pass '--bin _753'
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/_753-0c4494a3ea16c3b6` (signal: 11, SIGSEGV: invalid memory reference)
[INFO] running `Command { std: "docker" "inspect" "cca88ca2e5ff2ab2f19814a032f3b111945cc5427e2a5144826e7a214f91f8d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cca88ca2e5ff2ab2f19814a032f3b111945cc5427e2a5144826e7a214f91f8d2", kill_on_drop: false }`
[INFO] [stdout] cca88ca2e5ff2ab2f19814a032f3b111945cc5427e2a5144826e7a214f91f8d2
