[INFO] cloning repository https://github.com/farodin91/dust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/farodin91/dust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffarodin91%2Fdust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffarodin91%2Fdust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c8869a1e62c9c158eae066ce4a635efc89d9fd92
[INFO] testing farodin91/dust against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffarodin91%2Fdust" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/farodin91/dust on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/farodin91/dust
[INFO] finished tweaking git repo https://github.com/farodin91/dust
[INFO] tweaked toml for git repo https://github.com/farodin91/dust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/farodin91/dust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1a3ec14559e50796f487b77e123d8f911b40dece6d3b4be808f22f8ce479153b
[INFO] running `Command { std: "docker" "start" "-a" "1a3ec14559e50796f487b77e123d8f911b40dece6d3b4be808f22f8ce479153b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a3ec14559e50796f487b77e123d8f911b40dece6d3b4be808f22f8ce479153b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a3ec14559e50796f487b77e123d8f911b40dece6d3b4be808f22f8ce479153b", kill_on_drop: false }`
[INFO] [stdout] 1a3ec14559e50796f487b77e123d8f911b40dece6d3b4be808f22f8ce479153b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb62f0edf3a931dbc81ead3e522d5257879bf53486b5a923b36dfa89fd7d4118
[INFO] running `Command { std: "docker" "start" "-a" "eb62f0edf3a931dbc81ead3e522d5257879bf53486b5a923b36dfa89fd7d4118", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]    Compiling dust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(quote, concat_idents, plugin_registrar, rustc_private)]
[INFO] [stdout]   |            ^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:3:34
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(quote, concat_idents, plugin_registrar, rustc_private)]
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: a __rustc_plugin_registrar symbol must now be defined instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(custom_attribute)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `rustc_plugin`
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | extern crate rustc_plugin;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `syntax`
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | extern crate syntax;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find macro `quote_item` in this scope
[INFO] [stdout]   --> src/lib.rs:48:36
[INFO] [stdout]    |
[INFO] [stdout] 48 |             push(Annotatable::Item(quote_item!(ecx,
[INFO] [stdout]    |                                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `plugin_registrar` in this scope
[INFO] [stdout]   --> src/lib.rs:78:3
[INFO] [stdout]    |
[INFO] [stdout] 78 | #[plugin_registrar]
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `plugin_registrar` is in scope, but it is a function, not an attribute
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Annotatable`
[INFO] [stdout]   --> src/function.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |             Annotatable::Item(ref item) => match item.node {
[INFO] [stdout]    |             ^^^^^^^^^^^ use of undeclared type `Annotatable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `ItemKind`
[INFO] [stdout]   --> src/function.rs:16:17
[INFO] [stdout]    |
[INFO] [stdout] 16 |                 ItemKind::Fn(ref decl, ..) => {
[INFO] [stdout]    |                 ^^^^^^^^ use of undeclared type `ItemKind`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Annotatable`
[INFO] [stdout]   --> src/function.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 |             Annotatable::TraitItem(ref item) => return Err(item.span),
[INFO] [stdout]    |             ^^^^^^^^^^^ use of undeclared type `Annotatable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Annotatable`
[INFO] [stdout]   --> src/function.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Annotatable::ImplItem(ref item) => return Err(item.span),
[INFO] [stdout]    |             ^^^^^^^^^^^ use of undeclared type `Annotatable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Ident`
[INFO] [stdout]   --> src/ident_ext.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |         Ident::from_str(new_ident.as_str())
[INFO] [stdout]    |         ^^^^^ use of undeclared type `Ident`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Ident`
[INFO] [stdout]   --> src/ident_ext.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Ident::from_str(new_ident.as_str())
[INFO] [stdout]    |         ^^^^^ use of undeclared type `Ident`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |         _: &ast::MetaItem,
[INFO] [stdout]    |             ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Annotatable`
[INFO] [stdout]   --> src/lib.rs:48:18
[INFO] [stdout]    |
[INFO] [stdout] 48 |             push(Annotatable::Item(quote_item!(ecx,
[INFO] [stdout]    |                  ^^^^^^^^^^^ use of undeclared type `Annotatable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |         _: &ast::MetaItem,
[INFO] [stdout]    |             ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Symbol`
[INFO] [stdout]   --> src/lib.rs:81:35
[INFO] [stdout]    |
[INFO] [stdout] 81 |     reg.register_syntax_extension(Symbol::intern("theory"), SyntaxExtension::MultiDecorator(Box::new(theory)));
[INFO] [stdout]    |                                   ^^^^^^ use of undeclared type `Symbol`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `SyntaxExtension`
[INFO] [stdout]   --> src/lib.rs:81:61
[INFO] [stdout]    |
[INFO] [stdout] 81 |     reg.register_syntax_extension(Symbol::intern("theory"), SyntaxExtension::MultiDecorator(Box::new(theory)));
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^^ use of undeclared type `SyntaxExtension`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Symbol`
[INFO] [stdout]   --> src/lib.rs:83:35
[INFO] [stdout]    |
[INFO] [stdout] 83 |     reg.register_syntax_extension(Symbol::intern("data"), SyntaxExtension::MultiDecorator(Box::new(data)));
[INFO] [stdout]    |                                   ^^^^^^ use of undeclared type `Symbol`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `SyntaxExtension`
[INFO] [stdout]   --> src/lib.rs:83:59
[INFO] [stdout]    |
[INFO] [stdout] 83 |     reg.register_syntax_extension(Symbol::intern("data"), SyntaxExtension::MultiDecorator(Box::new(data)));
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^^ use of undeclared type `SyntaxExtension`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]  --> src/function.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 |     ident: Ident,
[INFO] [stdout]   |            ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `FnDecl` in this scope
[INFO] [stdout]  --> src/function.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 |     decl: FnDecl,
[INFO] [stdout]   |           ^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Attribute` in this scope
[INFO] [stdout]  --> src/function.rs:9:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Function {
[INFO] [stdout]   |                    - help: you might be missing a type parameter: `<Attribute>`
[INFO] [stdout] ...
[INFO] [stdout] 9 |     attrs: Vec<Attribute>,
[INFO] [stdout]   |                ^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Annotatable` in this scope
[INFO] [stdout]   --> src/function.rs:13:29
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn from(annotated: &Annotatable) -> Result<Function, Span> {
[INFO] [stdout]    |                             ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Span` in this scope
[INFO] [stdout]   --> src/function.rs:13:62
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Function {
[INFO] [stdout]    |     - help: you might be missing a type parameter: `<Span>`
[INFO] [stdout] 13 |     pub fn from(annotated: &Annotatable) -> Result<Function, Span> {
[INFO] [stdout]    |                                                              ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]   --> src/function.rs:32:29
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn ident(&self) -> &Ident {
[INFO] [stdout]    |                             ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Attribute` in this scope
[INFO] [stdout]   --> src/function.rs:36:33
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Function {
[INFO] [stdout]    |     - help: you might be missing a type parameter: `<Attribute>`
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn attrs(&self) -> &Vec<Attribute> {
[INFO] [stdout]    |                                 ^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]  --> src/ident_ext.rs:5:48
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn prepend<T: Display>(&self, other: T) -> Ident;
[INFO] [stdout]   |                                                ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]  --> src/ident_ext.rs:6:47
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn append<T: Display>(&self, other: T) -> Ident;
[INFO] [stdout]   |                                               ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]  --> src/ident_ext.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 | impl IdentExt for Ident {
[INFO] [stdout]   |                   ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]   --> src/ident_ext.rs:10:48
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn prepend<T: Display>(&self, other: T) -> Ident {
[INFO] [stdout]    |                                                ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Ident` in this scope
[INFO] [stdout]   --> src/ident_ext.rs:15:47
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn append<T: Display>(&self, other: T) -> Ident {
[INFO] [stdout]    |                                               ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0405]: cannot find trait `MultiItemDecorator` in this scope
[INFO] [stdout]   --> src/lib.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl MultiItemDecorator for Theory {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `ExtCtxt` in this scope
[INFO] [stdout]   --> src/lib.rs:27:19
[INFO] [stdout]    |
[INFO] [stdout] 27 |         ecx: &mut ExtCtxt,
[INFO] [stdout]    |                   ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Span` in this scope
[INFO] [stdout]   --> src/lib.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |         sp: Span,
[INFO] [stdout]    |             ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Annotatable` in this scope
[INFO] [stdout]   --> src/lib.rs:30:16
[INFO] [stdout]    |
[INFO] [stdout] 30 |         item: &Annotatable,
[INFO] [stdout]    |                ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Annotatable` in this scope
[INFO] [stdout]   --> src/lib.rs:31:26
[INFO] [stdout]    |
[INFO] [stdout] 31 |         push: &mut FnMut(Annotatable)
[INFO] [stdout]    |                          ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0405]: cannot find trait `MultiItemDecorator` in this scope
[INFO] [stdout]   --> src/lib.rs:61:6
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl MultiItemDecorator for Data {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `ExtCtxt` in this scope
[INFO] [stdout]   --> src/lib.rs:64:19
[INFO] [stdout]    |
[INFO] [stdout] 64 |         ecx: &mut ExtCtxt,
[INFO] [stdout]    |                   ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Span` in this scope
[INFO] [stdout]   --> src/lib.rs:65:13
[INFO] [stdout]    |
[INFO] [stdout] 65 |         sp: Span,
[INFO] [stdout]    |             ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Annotatable` in this scope
[INFO] [stdout]   --> src/lib.rs:67:16
[INFO] [stdout]    |
[INFO] [stdout] 67 |         item: &Annotatable,
[INFO] [stdout]    |                ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Annotatable` in this scope
[INFO] [stdout]   --> src/lib.rs:68:23
[INFO] [stdout]    |
[INFO] [stdout] 68 |         _: &mut FnMut(Annotatable)
[INFO] [stdout]    |                       ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Registry` in this scope
[INFO] [stdout]   --> src/lib.rs:79:35
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn plugin_registrar(reg: &mut Registry) {
[INFO] [stdout]    |                                   ^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(quote, concat_idents, plugin_registrar, rustc_private)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(custom_attribute)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 45 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dust` due to 46 previous errors
[INFO] [stdout] Some errors have detailed explanations: E0405, E0412, E0433, E0463, E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0405`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "eb62f0edf3a931dbc81ead3e522d5257879bf53486b5a923b36dfa89fd7d4118", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb62f0edf3a931dbc81ead3e522d5257879bf53486b5a923b36dfa89fd7d4118", kill_on_drop: false }`
[INFO] [stdout] eb62f0edf3a931dbc81ead3e522d5257879bf53486b5a923b36dfa89fd7d4118