[INFO] fetching crate webplatform_concat_bytes 0.0.1...
[INFO] testing webplatform_concat_bytes-0.0.1 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate webplatform_concat_bytes 0.0.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate webplatform_concat_bytes 0.0.1 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate webplatform_concat_bytes 0.0.1
[INFO] finished tweaking crates.io crate webplatform_concat_bytes 0.0.1
[INFO] tweaked toml for crates.io crate webplatform_concat_bytes 0.0.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "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] eea0f2741a0e8f4fad06b3cf79673cae0a2a271be454d3c5096c4a43deaa967e
[INFO] running `Command { std: "docker" "start" "-a" "eea0f2741a0e8f4fad06b3cf79673cae0a2a271be454d3c5096c4a43deaa967e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eea0f2741a0e8f4fad06b3cf79673cae0a2a271be454d3c5096c4a43deaa967e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eea0f2741a0e8f4fad06b3cf79673cae0a2a271be454d3c5096c4a43deaa967e", kill_on_drop: false }`
[INFO] [stdout] eea0f2741a0e8f4fad06b3cf79673cae0a2a271be454d3c5096c4a43deaa967e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--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] f3b523ad4c121e6cd7d21f194c80275bc088a3d5bf1d33dc20be80e9a67f35c4
[INFO] running `Command { std: "docker" "start" "-a" "f3b523ad4c121e6cd7d21f194c80275bc088a3d5bf1d33dc20be80e9a67f35c4", kill_on_drop: false }`
[INFO] [stderr]    Compiling webplatform_concat_bytes v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(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[E0463]: can't find crate for `syntax`
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate syntax;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0462]: found staticlib `rustc` instead of rlib or dylib
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | 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/beta-2022-04-10-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-beta_rt.msan.a
[INFO] [stdout]           crate `rustc`: /opt/rustwide/rustup-home/toolchains/beta-2022-04-10-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-beta_rt.asan.a
[INFO] [stdout]           crate `rustc`: /opt/rustwide/rustup-home/toolchains/beta-2022-04-10-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-beta_rt.lsan.a
[INFO] [stdout]           crate `rustc`: /opt/rustwide/rustup-home/toolchains/beta-2022-04-10-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-beta_rt.tsan.a
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `plugin_registrar` in this scope
[INFO] [stdout]   --> src/lib.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[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 `base`
[INFO] [stdout]  --> src/expand.rs:9:35
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn expand_syntax_ext(cx: &mut base::ExtCtxt,
[INFO] [stdout]   |                                   ^^^^ use of undeclared crate or module `base`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `codemap`
[INFO] [stdout]   --> src/expand.rs:10:30
[INFO] [stdout]    |
[INFO] [stdout] 10 |                          sp: codemap::Span,
[INFO] [stdout]    |                              ^^^^^^^ use of undeclared crate or module `codemap`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/expand.rs:11:33
[INFO] [stdout]    |
[INFO] [stdout] 11 |                          tts: &[ast::TokenTree])
[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 `base`
[INFO] [stdout]   --> src/expand.rs:12:33
[INFO] [stdout]    |
[INFO] [stdout] 12 |                          -> Box<base::MacResult+'static> {
[INFO] [stdout]    |                                 ^^^^ use of undeclared crate or module `base`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `base`
[INFO] [stdout]   --> src/expand.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let es = match base::get_exprs_from_tts(cx, sp, tts) {
[INFO] [stdout]    |                    ^^^^ use of undeclared crate or module `base`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `base`
[INFO] [stdout]   --> src/expand.rs:15:24
[INFO] [stdout]    |
[INFO] [stdout] 15 |         None => return base::DummyResult::expr(sp)
[INFO] [stdout]    |                        ^^^^ use of undeclared crate or module `base`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/expand.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |             ast::ExprLit(ref lit) => {
[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/expand.rs:22:21
[INFO] [stdout]    |
[INFO] [stdout] 22 |                     ast::LitStr(ref s, _) |
[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/expand.rs:23:21
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     ast::LitFloat(ref s, _) |
[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/expand.rs:24:21
[INFO] [stdout]    |
[INFO] [stdout] 24 |                     ast::LitFloatUnsuffixed(ref s) => {
[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/expand.rs:27:21
[INFO] [stdout]    |
[INFO] [stdout] 27 |                     ast::LitChar(c) => {
[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/expand.rs:30:21
[INFO] [stdout]    |
[INFO] [stdout] 30 |                     ast::LitInt(i, ast::UnsignedIntLit(_)) |
[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/expand.rs:30:36
[INFO] [stdout]    |
[INFO] [stdout] 30 |                     ast::LitInt(i, ast::UnsignedIntLit(_)) |
[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/expand.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |                     ast::LitInt(i, ast::SignedIntLit(_, ast::Plus)) |
[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/expand.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 |                     ast::LitInt(i, ast::SignedIntLit(_, ast::Plus)) |
[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/expand.rs:31:57
[INFO] [stdout]    |
[INFO] [stdout] 31 |                     ast::LitInt(i, ast::SignedIntLit(_, ast::Plus)) |
[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/expand.rs:32:21
[INFO] [stdout]    |
[INFO] [stdout] 32 |                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Plus)) => {
[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/expand.rs:32:36
[INFO] [stdout]    |
[INFO] [stdout] 32 |                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Plus)) => {
[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/expand.rs:32:58
[INFO] [stdout]    |
[INFO] [stdout] 32 |                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Plus)) => {
[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/expand.rs:35:21
[INFO] [stdout]    |
[INFO] [stdout] 35 |                     ast::LitInt(i, ast::SignedIntLit(_, ast::Minus)) |
[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/expand.rs:35:36
[INFO] [stdout]    |
[INFO] [stdout] 35 |                     ast::LitInt(i, ast::SignedIntLit(_, ast::Minus)) |
[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/expand.rs:35:57
[INFO] [stdout]    |
[INFO] [stdout] 35 |                     ast::LitInt(i, ast::SignedIntLit(_, ast::Minus)) |
[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/expand.rs:36:21
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Minus)) => {
[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/expand.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Minus)) => {
[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/expand.rs:36:58
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Minus)) => {
[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/expand.rs:39:21
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     ast::LitBool(b) => {
[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/expand.rs:42:21
[INFO] [stdout]    |
[INFO] [stdout] 42 |                     ast::LitByte(b) => {
[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/expand.rs:45:21
[INFO] [stdout]    |
[INFO] [stdout] 45 |                     ast::LitBinary(ref bytes) => {
[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 `base`
[INFO] [stdout]   --> src/expand.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     base::MacEager::expr(cx.expr_lit(
[INFO] [stdout]    |     ^^^^ use of undeclared crate or module `base`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `ast`
[INFO] [stdout]   --> src/expand.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         ast::LitBinary(Rc::new(accumulator))
[INFO] [stdout]    |         ^^^ use of undeclared crate or module `ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Registry` in this scope
[INFO] [stdout]   --> src/lib.rs:13:35
[INFO] [stdout]    |
[INFO] [stdout] 13 | 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 beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(plugin_registrar, rustc_private)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(collections)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(collections)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `collections`
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(collections)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/expand.rs:12:33
[INFO] [stdout]    |
[INFO] [stdout] 12 |                          -> Box<base::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] 12 -                          -> Box<base::MacResult+'static> {
[INFO] [stdout] 12 +                          -> Box<dyn base::MacResult+'static> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 42 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0433, E0463, E0554, E0557, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `webplatform_concat_bytes` due to 43 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "f3b523ad4c121e6cd7d21f194c80275bc088a3d5bf1d33dc20be80e9a67f35c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3b523ad4c121e6cd7d21f194c80275bc088a3d5bf1d33dc20be80e9a67f35c4", kill_on_drop: false }`
[INFO] [stdout] f3b523ad4c121e6cd7d21f194c80275bc088a3d5bf1d33dc20be80e9a67f35c4