[INFO] cloning repository https://github.com/paavohuhtala/bfcrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/paavohuhtala/bfcrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpaavohuhtala%2Fbfcrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpaavohuhtala%2Fbfcrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cfa75356188b83ce56b1de13366bd431c304cfa2
[INFO] checking paavohuhtala/bfcrs against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpaavohuhtala%2Fbfcrs" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/paavohuhtala/bfcrs on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/paavohuhtala/bfcrs
[INFO] finished tweaking git repo https://github.com/paavohuhtala/bfcrs
[INFO] tweaked toml for git repo https://github.com/paavohuhtala/bfcrs written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/paavohuhtala/bfcrs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded leb128 v0.2.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3c732031ce5c13f7a87ad2f310c9941a23b8ebdbd014d521225f571c805e8651
[INFO] running `Command { std: "docker" "start" "-a" "3c732031ce5c13f7a87ad2f310c9941a23b8ebdbd014d521225f571c805e8651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c732031ce5c13f7a87ad2f310c9941a23b8ebdbd014d521225f571c805e8651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c732031ce5c13f7a87ad2f310c9941a23b8ebdbd014d521225f571c805e8651", kill_on_drop: false }`
[INFO] [stdout] 3c732031ce5c13f7a87ad2f310c9941a23b8ebdbd014d521225f571c805e8651
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=forbid" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fd8ce16561542007e1c97d8df9d66ea06f1304b47db4e431160f54e1db6ca335
[INFO] running `Command { std: "docker" "start" "-a" "fd8ce16561542007e1c97d8df9d66ea06f1304b47db4e431160f54e1db6ca335", kill_on_drop: false }`
[INFO] [stderr]     Checking leb128 v0.2.3
[INFO] [stderr]     Checking bfcrs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:13:45
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                             ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:13:83
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                                                                   ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:14:79
[INFO] [stdout]    |
[INFO] [stdout] 14 |       (Some(Offset(offs_a, ChangeValue(a))), [Offset(offs_b, ChangeValue(b)), tail..])
[INFO] [stdout]    |                                                                               ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:17:65
[INFO] [stdout]    |
[INFO] [stdout] 17 |         (Some(ProgramToken::offs_change_value(*offs_a, a + b)), tail)
[INFO] [stdout]    |                                                                 ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:21:68
[INFO] [stdout]    |
[INFO] [stdout] 21 |         [Offset(0, ChangeValue(value)), ChangeAddr(addr_offset_b), tail..],
[INFO] [stdout]    |                                                                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:27:11
[INFO] [stdout]    |
[INFO] [stdout] 27 |           tail,
[INFO] [stdout]    |           ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:38:52
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                                                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:42:76
[INFO] [stdout]    |
[INFO] [stdout] 42 |       (Some(Offset(offs_a, SetValue(0))), [Offset(offs_b, ChangeValue(a)), tail..])
[INFO] [stdout]    |                                                                            ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |         (Some(ProgramToken::offs_set_value(*offs_a, *a)), tail)
[INFO] [stdout]    |                                                           ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:47:73
[INFO] [stdout]    |
[INFO] [stdout] 47 |       (Some(Offset(offs_a, SetValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                         ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:48:78
[INFO] [stdout]    |
[INFO] [stdout] 48 |       | (Some(Offset(offs_a, ChangeValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                              ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:51:59
[INFO] [stdout]    |
[INFO] [stdout] 51 |         (Some(ProgramToken::offs_set_value(*offs_a, *a)), tail)
[INFO] [stdout]    |                                                           ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |       (Some(ref token), [head, tail..]) => {
[INFO] [stdout]    |                                ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:60:30
[INFO] [stdout]    |
[INFO] [stdout] 60 |         (Some(head.clone()), tail)
[INFO] [stdout]    |                              ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:62:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                     ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:62:54
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                                                      ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:13:45
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:14:79
[INFO] [stdout]    |
[INFO] [stdout] 14 |       (Some(Offset(offs_a, ChangeValue(a))), [Offset(offs_b, ChangeValue(b)), tail..])
[INFO] [stdout]    |                                                                               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:21:68
[INFO] [stdout]    |
[INFO] [stdout] 21 |         [Offset(0, ChangeValue(value)), ChangeAddr(addr_offset_b), tail..],
[INFO] [stdout]    |                                                                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:42:76
[INFO] [stdout]    |
[INFO] [stdout] 42 |       (Some(Offset(offs_a, SetValue(0))), [Offset(offs_b, ChangeValue(a)), tail..])
[INFO] [stdout]    |                                                                            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:47:73
[INFO] [stdout]    |
[INFO] [stdout] 47 |       (Some(Offset(offs_a, SetValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:48:78
[INFO] [stdout]    |
[INFO] [stdout] 48 |       | (Some(Offset(offs_a, ChangeValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |       (Some(ref token), [head, tail..]) => {
[INFO] [stdout]    |                                ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:62:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:13:45
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:14:79
[INFO] [stdout]    |
[INFO] [stdout] 14 |       (Some(Offset(offs_a, ChangeValue(a))), [Offset(offs_b, ChangeValue(b)), tail..])
[INFO] [stdout]    |                                                                               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:21:68
[INFO] [stdout]    |
[INFO] [stdout] 21 |         [Offset(0, ChangeValue(value)), ChangeAddr(addr_offset_b), tail..],
[INFO] [stdout]    |                                                                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:42:76
[INFO] [stdout]    |
[INFO] [stdout] 42 |       (Some(Offset(offs_a, SetValue(0))), [Offset(offs_b, ChangeValue(a)), tail..])
[INFO] [stdout]    |                                                                            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:47:73
[INFO] [stdout]    |
[INFO] [stdout] 47 |       (Some(Offset(offs_a, SetValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:48:78
[INFO] [stdout]    |
[INFO] [stdout] 48 |       | (Some(Offset(offs_a, ChangeValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |       (Some(ref token), [head, tail..]) => {
[INFO] [stdout]    |                                ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:62:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/code_stream.rs:85:66
[INFO] [stdout]    |
[INFO] [stdout] 85 |   pub fn emit_print_string(&mut self, s: &str) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                                  ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/code_stream.rs:93:61
[INFO] [stdout]    |
[INFO] [stdout] 93 |   pub fn emit(&mut self, op: Instruction) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/module_builder.rs:29:56
[INFO] [stdout]    |
[INFO] [stdout] 29 |   pub fn add_section(&mut self, id: u8, entries: &[Box<Fn(&mut dyn Write) -> ()>]) {
[INFO] [stdout]    |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut dyn Write) -> ()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/module_builder.rs:40:82
[INFO] [stdout]    |
[INFO] [stdout] 40 |   pub fn write_to_stream(mut self, mut stream: &mut dyn Write) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                                                  ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/module_builder.rs:66:21
[INFO] [stdout]    |
[INFO] [stdout] 66 | ) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                     ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/backend/wasm/module_builder.rs:321:23
[INFO] [stdout]     |
[INFO] [stdout] 321 |   ) -> Result<(), Box<Error>> {
[INFO] [stdout]     |                       ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/mod.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Backend {
[INFO] [stdout]    |      ^^^^^^^ help: use `dyn`: `dyn Backend`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/mod.rs:13:46
[INFO] [stdout]    |
[INFO] [stdout] 13 |   pub fn from_name(name: &str) -> Option<Box<Backend>> {
[INFO] [stdout]    |                                              ^^^^^^^ help: use `dyn`: `dyn Backend`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:13:45
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                             ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:13:83
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                                                                   ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:14:79
[INFO] [stdout]    |
[INFO] [stdout] 14 |       (Some(Offset(offs_a, ChangeValue(a))), [Offset(offs_b, ChangeValue(b)), tail..])
[INFO] [stdout]    |                                                                               ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:17:65
[INFO] [stdout]    |
[INFO] [stdout] 17 |         (Some(ProgramToken::offs_change_value(*offs_a, a + b)), tail)
[INFO] [stdout]    |                                                                 ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:21:68
[INFO] [stdout]    |
[INFO] [stdout] 21 |         [Offset(0, ChangeValue(value)), ChangeAddr(addr_offset_b), tail..],
[INFO] [stdout]    |                                                                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:27:11
[INFO] [stdout]    |
[INFO] [stdout] 27 |           tail,
[INFO] [stdout]    |           ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:38:52
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                                                    ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:42:76
[INFO] [stdout]    |
[INFO] [stdout] 42 |       (Some(Offset(offs_a, SetValue(0))), [Offset(offs_b, ChangeValue(a)), tail..])
[INFO] [stdout]    |                                                                            ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |         (Some(ProgramToken::offs_set_value(*offs_a, *a)), tail)
[INFO] [stdout]    |                                                           ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:47:73
[INFO] [stdout]    |
[INFO] [stdout] 47 |       (Some(Offset(offs_a, SetValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                         ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:48:78
[INFO] [stdout]    |
[INFO] [stdout] 48 |       | (Some(Offset(offs_a, ChangeValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                              ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:51:59
[INFO] [stdout]    |
[INFO] [stdout] 51 |         (Some(ProgramToken::offs_set_value(*offs_a, *a)), tail)
[INFO] [stdout]    |                                                           ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |       (Some(ref token), [head, tail..]) => {
[INFO] [stdout]    |                                ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:60:30
[INFO] [stdout]    |
[INFO] [stdout] 60 |         (Some(head.clone()), tail)
[INFO] [stdout]    |                              ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:62:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                     ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `tail` in this scope
[INFO] [stdout]   --> src/optimizer.rs:62:54
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                                                      ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:13:45
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:14:79
[INFO] [stdout]    |
[INFO] [stdout] 14 |       (Some(Offset(offs_a, ChangeValue(a))), [Offset(offs_b, ChangeValue(b)), tail..])
[INFO] [stdout]    |                                                                               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:21:68
[INFO] [stdout]    |
[INFO] [stdout] 21 |         [Offset(0, ChangeValue(value)), ChangeAddr(addr_offset_b), tail..],
[INFO] [stdout]    |                                                                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:42:76
[INFO] [stdout]    |
[INFO] [stdout] 42 |       (Some(Offset(offs_a, SetValue(0))), [Offset(offs_b, ChangeValue(a)), tail..])
[INFO] [stdout]    |                                                                            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:47:73
[INFO] [stdout]    |
[INFO] [stdout] 47 |       (Some(Offset(offs_a, SetValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:48:78
[INFO] [stdout]    |
[INFO] [stdout] 48 |       | (Some(Offset(offs_a, ChangeValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |       (Some(ref token), [head, tail..]) => {
[INFO] [stdout]    |                                ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: half-open range patterns are unstable
[INFO] [stdout]   --> src/optimizer.rs:62:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stdout]    = help: add `#![feature(half_open_range_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:13:45
[INFO] [stdout]    |
[INFO] [stdout] 13 |       (Some(ChangeAddr(a)), [ChangeAddr(b), tail..]) => (Some(ChangeAddr(a + b)), tail),
[INFO] [stdout]    |                                             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:14:79
[INFO] [stdout]    |
[INFO] [stdout] 14 |       (Some(Offset(offs_a, ChangeValue(a))), [Offset(offs_b, ChangeValue(b)), tail..])
[INFO] [stdout]    |                                                                               ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:21:68
[INFO] [stdout]    |
[INFO] [stdout] 21 |         [Offset(0, ChangeValue(value)), ChangeAddr(addr_offset_b), tail..],
[INFO] [stdout]    |                                                                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |             [head, tail..] => (Some(head.clone()), tail),
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:42:76
[INFO] [stdout]    |
[INFO] [stdout] 42 |       (Some(Offset(offs_a, SetValue(0))), [Offset(offs_b, ChangeValue(a)), tail..])
[INFO] [stdout]    |                                                                            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:47:73
[INFO] [stdout]    |
[INFO] [stdout] 47 |       (Some(Offset(offs_a, SetValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:48:78
[INFO] [stdout]    |
[INFO] [stdout] 48 |       | (Some(Offset(offs_a, ChangeValue(_))), [Offset(offs_b, SetValue(a)), tail..])
[INFO] [stdout]    |                                                                              ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |       (Some(ref token), [head, tail..]) => {
[INFO] [stdout]    |                                ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: exclusive range pattern syntax is experimental
[INFO] [stdout]   --> src/optimizer.rs:62:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |       (None, [head, tail..]) => (Some(head.clone()), tail),
[INFO] [stdout]    |                     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
[INFO] [stdout]    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/code_stream.rs:85:66
[INFO] [stdout]    |
[INFO] [stdout] 85 |   pub fn emit_print_string(&mut self, s: &str) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                                  ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/code_stream.rs:93:61
[INFO] [stdout]    |
[INFO] [stdout] 93 |   pub fn emit(&mut self, op: Instruction) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/module_builder.rs:29:56
[INFO] [stdout]    |
[INFO] [stdout] 29 |   pub fn add_section(&mut self, id: u8, entries: &[Box<Fn(&mut dyn Write) -> ()>]) {
[INFO] [stdout]    |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut dyn Write) -> ()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/module_builder.rs:40:82
[INFO] [stdout]    |
[INFO] [stdout] 40 |   pub fn write_to_stream(mut self, mut stream: &mut dyn Write) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                                                  ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/wasm/module_builder.rs:66:21
[INFO] [stdout]    |
[INFO] [stdout] 66 | ) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                     ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/backend/wasm/module_builder.rs:321:23
[INFO] [stdout]     |
[INFO] [stdout] 321 |   ) -> Result<(), Box<Error>> {
[INFO] [stdout]     |                       ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/mod.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Backend {
[INFO] [stdout]    |      ^^^^^^^ help: use `dyn`: `dyn Backend`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/backend/mod.rs:13:46
[INFO] [stdout]    |
[INFO] [stdout] 13 |   pub fn from_name(name: &str) -> Option<Box<Backend>> {
[INFO] [stdout]    |                                              ^^^^^^^ help: use `dyn`: `dyn Backend`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 35 previous errors; 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bfcrs`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 35 previous errors; 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "fd8ce16561542007e1c97d8df9d66ea06f1304b47db4e431160f54e1db6ca335", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd8ce16561542007e1c97d8df9d66ea06f1304b47db4e431160f54e1db6ca335", kill_on_drop: false }`
[INFO] [stdout] fd8ce16561542007e1c97d8df9d66ea06f1304b47db4e431160f54e1db6ca335