[INFO] fetching crate shiny 0.1.3...
[INFO] testing shiny-0.1.3 against 1.60.0 for beta-1.61-1
[INFO] extracting crate shiny 0.1.3 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate shiny 0.1.3 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 crates.io crate shiny 0.1.3
[INFO] finished tweaking crates.io crate shiny 0.1.3
[INFO] tweaked toml for crates.io crate shiny 0.1.3 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 8202fb88ea9f9dc12d4c6362be05962ca71b1aa5acbcc1047fb0e0b565efbe91
[INFO] running `Command { std: "docker" "start" "-a" "8202fb88ea9f9dc12d4c6362be05962ca71b1aa5acbcc1047fb0e0b565efbe91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8202fb88ea9f9dc12d4c6362be05962ca71b1aa5acbcc1047fb0e0b565efbe91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8202fb88ea9f9dc12d4c6362be05962ca71b1aa5acbcc1047fb0e0b565efbe91", kill_on_drop: false }`
[INFO] [stdout] 8202fb88ea9f9dc12d4c6362be05962ca71b1aa5acbcc1047fb0e0b565efbe91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] c4e91ef66ae295a79b55bbcf10b968d926d6cdd9dc6dafcd5e0bb3d1bcfd4657
[INFO] running `Command { std: "docker" "start" "-a" "c4e91ef66ae295a79b55bbcf10b968d926d6cdd9dc6dafcd5e0bb3d1bcfd4657", kill_on_drop: false }`
[INFO] [stderr]    Compiling shiny v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/lib.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(plugin_registrar)]
[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[E0462]: found staticlib `rustc` instead of rlib or dylib
[INFO] [stdout]   --> src/lib.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | extern crate rustc;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: please recompile that crate using --crate-type lib
[INFO] [stdout]    = note: the following crate versions were found:
[INFO] [stdout]            crate `rustc`: /opt/rustwide/rustup-home/toolchains/1.60.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-stable_rt.tsan.a
[INFO] [stdout]            crate `rustc`: /opt/rustwide/rustup-home/toolchains/1.60.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-stable_rt.lsan.a
[INFO] [stdout]            crate `rustc`: /opt/rustwide/rustup-home/toolchains/1.60.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-stable_rt.msan.a
[INFO] [stdout]            crate `rustc`: /opt/rustwide/rustup-home/toolchains/1.60.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-stable_rt.asan.a
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `syntax`
[INFO] [stdout]   --> src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | extern crate syntax;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `plugin_registrar` in this scope
[INFO] [stdout]   --> src/lib.rs:36:3
[INFO] [stdout]    |
[INFO] [stdout] 36 | #[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 crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:41:57
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout]    |                                                         ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `token`
[INFO] [stdout]   --> src/lib.rs:51:28
[INFO] [stdout]    |
[INFO] [stdout] 51 |         if parser.token == token::Eof {
[INFO] [stdout]    |                            ^^^^^ use of undeclared crate or module `token`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:83:19
[INFO] [stdout]    |
[INFO] [stdout] 83 |                 P(ast::Block {
[INFO] [stdout]    |                   ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `token`
[INFO] [stdout]   --> src/lib.rs:93:36
[INFO] [stdout]    |
[INFO] [stdout] 93 |             cx.meta_word(DUMMY_SP, token::InternedString::new("test")));
[INFO] [stdout]    |                                    ^^^^^ use of undeclared crate or module `token`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:95:22
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let func = P(ast::Item {
[INFO] [stdout]    |                      ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:98:17
[INFO] [stdout]    |
[INFO] [stdout] 98 |             id: ast::DUMMY_NODE_ID,
[INFO] [stdout]    |                 ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/lib.rs:99:19
[INFO] [stdout]    |
[INFO] [stdout] 99 |             node: ast::ItemFn(
[INFO] [stdout]    |                   ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]    --> src/lib.rs:100:56
[INFO] [stdout]     |
[INFO] [stdout] 100 |                 cx.fn_decl(Vec::new(), cx.ty(DUMMY_SP, ast::Ty_::TyTup(Vec::new()))),
[INFO] [stdout]     |                                                        ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]    --> src/lib.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |                 ast::Unsafety::Normal,
[INFO] [stdout]     |                 ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `abi`
[INFO] [stdout]    --> src/lib.rs:102:17
[INFO] [stdout]     |
[INFO] [stdout] 102 |                 abi::Rust,
[INFO] [stdout]     |                 ^^^ use of undeclared crate or module `abi`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]    --> src/lib.rs:105:18
[INFO] [stdout]     |
[INFO] [stdout] 105 |             vis: ast::Inherited,
[INFO] [stdout]     |                  ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]    --> src/lib.rs:115:18
[INFO] [stdout]     |
[INFO] [stdout] 115 |     items: Vec<P<ast::Item>>
[INFO] [stdout]     |                  ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]    --> src/lib.rs:119:29
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn new(items: Vec<P<ast::Item>>) -> Box<MacResult+'static> {
[INFO] [stdout]     |                             ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]    --> src/lib.rs:125:64
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn make_items(self: Box<MacItems>) -> Option<SmallVector<P<ast::Item>>> {
[INFO] [stdout]     |                                                                ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `SmallVector`
[INFO] [stdout]    --> src/lib.rs:126:14
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Some(SmallVector::many(self.items.clone()))
[INFO] [stdout]     |              ^^^^^^^^^^^ use of undeclared type `SmallVector`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Registry` in this scope
[INFO] [stdout]   --> src/lib.rs:37:35
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn plugin_registrar(reg: &mut Registry) {
[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:41:32
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[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:41:44
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout]    |                                            ^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0405]: cannot find trait `MacResult` in this scope
[INFO] [stdout]   --> src/lib.rs:41:81
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout]    |                      -                                                          ^^^^^^^^^ not found in this scope
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      help: you might be missing a type parameter: `<MacResult>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `tts_to_parser` in this scope
[INFO] [stdout]   --> src/lib.rs:45:22
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let mut parser = tts_to_parser(sess, ttsvec, cx.cfg());
[INFO] [stdout]    |                      ^^^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function, tuple struct or tuple variant `P` in this scope
[INFO] [stdout]   --> src/lib.rs:83:17
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout]    |                      - help: you might be missing a type parameter: `<P>`
[INFO] [stdout] ...
[INFO] [stdout] 83 |                 P(ast::Block {
[INFO] [stdout]    |                 ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `DUMMY_SP` in this scope
[INFO] [stdout]   --> src/lib.rs:92:38
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let attr_test = cx.attribute(DUMMY_SP,
[INFO] [stdout]    |                                      ^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `DUMMY_SP` in this scope
[INFO] [stdout]   --> src/lib.rs:93:26
[INFO] [stdout]    |
[INFO] [stdout] 93 |             cx.meta_word(DUMMY_SP, token::InternedString::new("test")));
[INFO] [stdout]    |                          ^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function, tuple struct or tuple variant `P` in this scope
[INFO] [stdout]   --> src/lib.rs:95:20
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout]    |                      - help: you might be missing a type parameter: `<P>`
[INFO] [stdout] ...
[INFO] [stdout] 95 |         let func = P(ast::Item {
[INFO] [stdout]    |                    ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `DUMMY_SP` in this scope
[INFO] [stdout]    --> src/lib.rs:100:46
[INFO] [stdout]     |
[INFO] [stdout] 100 |                 cx.fn_decl(Vec::new(), cx.ty(DUMMY_SP, ast::Ty_::TyTup(Vec::new()))),
[INFO] [stdout]     |                                              ^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `empty_generics` in this scope
[INFO] [stdout]    --> src/lib.rs:103:17
[INFO] [stdout]     |
[INFO] [stdout] 103 |                 empty_generics(),
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `DUMMY_SP` in this scope
[INFO] [stdout]    --> src/lib.rs:106:19
[INFO] [stdout]     |
[INFO] [stdout] 106 |             span: DUMMY_SP,
[INFO] [stdout]     |                   ^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `P` in this scope
[INFO] [stdout]    --> src/lib.rs:115:16
[INFO] [stdout]     |
[INFO] [stdout] 115 |     items: Vec<P<ast::Item>>
[INFO] [stdout]     |                ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `P` in this scope
[INFO] [stdout]    --> src/lib.rs:119:27
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn new(items: Vec<P<ast::Item>>) -> Box<MacResult+'static> {
[INFO] [stdout]     |                           ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0405]: cannot find trait `MacResult` in this scope
[INFO] [stdout]    --> src/lib.rs:119:49
[INFO] [stdout]     |
[INFO] [stdout] 118 | impl MacItems {
[INFO] [stdout]     |     - help: you might be missing a type parameter: `<MacResult>`
[INFO] [stdout] 119 |     pub fn new(items: Vec<P<ast::Item>>) -> Box<MacResult+'static> {
[INFO] [stdout]     |                                                 ^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `MacResult` in this scope
[INFO] [stdout]    --> src/lib.rs:120:46
[INFO] [stdout]     |
[INFO] [stdout] 120 |           box MacItems { items: items } as Box<MacResult>
[INFO] [stdout]     |                                                ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: an enum with a similar name exists
[INFO] [stdout]     |
[INFO] [stdout] 120 |         box MacItems { items: items } as Box<Result>
[INFO] [stdout]     |                                              ~~~~~~
[INFO] [stdout] help: you might be missing a type parameter
[INFO] [stdout]     |
[INFO] [stdout] 118 | impl<MacResult> MacItems {
[INFO] [stdout]     |     +++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0405]: cannot find trait `MacResult` in this scope
[INFO] [stdout]    --> src/lib.rs:124:6
[INFO] [stdout]     |
[INFO] [stdout] 124 | impl MacResult for MacItems {
[INFO] [stdout]     |      ^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `SmallVector` in this scope
[INFO] [stdout]    --> src/lib.rs:125:50
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn make_items(self: Box<MacItems>) -> Option<SmallVector<P<ast::Item>>> {
[INFO] [stdout]     |                                                  ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `P` in this scope
[INFO] [stdout]    --> src/lib.rs:125:62
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn make_items(self: Box<MacItems>) -> Option<SmallVector<P<ast::Item>>> {
[INFO] [stdout]     |                                                              ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         box MacItems { items: items } as Box<MacResult>
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:41:81
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout]    |                                                                                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 - pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
[INFO] [stdout] 41 + pub fn macro_describe(cx: &mut ExtCtxt, _: Span, tts: &[ast::TokenTree]) -> Box<dyn MacResult+'static> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 39 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0405, E0412, E0425, E0433, E0463, E0557, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0405`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shiny` due to 40 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "c4e91ef66ae295a79b55bbcf10b968d926d6cdd9dc6dafcd5e0bb3d1bcfd4657", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4e91ef66ae295a79b55bbcf10b968d926d6cdd9dc6dafcd5e0bb3d1bcfd4657", kill_on_drop: false }`
[INFO] [stdout] c4e91ef66ae295a79b55bbcf10b968d926d6cdd9dc6dafcd5e0bb3d1bcfd4657