[INFO] fetching crate vga-rs 0.1.4...
[INFO] testing vga-rs-0.1.4 against master#1871252fc8bb672d40787e67404e6eaae7059369 for pr-125151
[INFO] extracting crate vga-rs 0.1.4 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate vga-rs 0.1.4 on toolchain 1871252fc8bb672d40787e67404e6eaae7059369
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vga-rs 0.1.4
[INFO] finished tweaking crates.io crate vga-rs 0.1.4
[INFO] tweaked toml for crates.io crate vga-rs 0.1.4 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded vgainfo-rs v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8eaa378f7de7a1dd89a1a6b389c0bfea8ca2071a1ac717a38f80fc10db8913a4
[INFO] running `Command { std: "docker" "start" "-a" "8eaa378f7de7a1dd89a1a6b389c0bfea8ca2071a1ac717a38f80fc10db8913a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8eaa378f7de7a1dd89a1a6b389c0bfea8ca2071a1ac717a38f80fc10db8913a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8eaa378f7de7a1dd89a1a6b389c0bfea8ca2071a1ac717a38f80fc10db8913a4", kill_on_drop: false }`
[INFO] [stdout] 8eaa378f7de7a1dd89a1a6b389c0bfea8ca2071a1ac717a38f80fc10db8913a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c4db254b5aa7b705b22a9c3f9c6365fab31c63229b732ba23eb38083e348574
[INFO] running `Command { std: "docker" "start" "-a" "0c4db254b5aa7b705b22a9c3f9c6365fab31c63229b732ba23eb38083e348574", kill_on_drop: false }`
[INFO] [stderr]    Compiling vgainfo-rs v0.1.1
[INFO] [stderr]    Compiling vga-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "0c4db254b5aa7b705b22a9c3f9c6365fab31c63229b732ba23eb38083e348574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c4db254b5aa7b705b22a9c3f9c6365fab31c63229b732ba23eb38083e348574", kill_on_drop: false }`
[INFO] [stdout] 0c4db254b5aa7b705b22a9c3f9c6365fab31c63229b732ba23eb38083e348574
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0a7c4693603c47a77cad2ba910ac2748fcd4d10e5ce8453aacd2f4c784102ec
[INFO] running `Command { std: "docker" "start" "-a" "e0a7c4693603c47a77cad2ba910ac2748fcd4d10e5ce8453aacd2f4c784102ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling vga-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "e0a7c4693603c47a77cad2ba910ac2748fcd4d10e5ce8453aacd2f4c784102ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0a7c4693603c47a77cad2ba910ac2748fcd4d10e5ce8453aacd2f4c784102ec", kill_on_drop: false }`
[INFO] [stdout] e0a7c4693603c47a77cad2ba910ac2748fcd4d10e5ce8453aacd2f4c784102ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0c83f0a48da560aa9f56f3a143373b9e043830297d5cb18ff966c5a42eb3aa64
[INFO] running `Command { std: "docker" "start" "-a" "0c83f0a48da560aa9f56f3a143373b9e043830297d5cb18ff966c5a42eb3aa64", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/vga_rs-413314c858c64151)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/basic.rs (/opt/rustwide/target/debug/deps/basic-ba917d3f6090f607)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test tests::test_float_work_success ... ok
[INFO] [stdout] test tests::test_reference_work_success ... ok
[INFO] [stdout] test tests::test_option_work_success ... ok
[INFO] [stdout] test tests::test_integer_work_success ... ok
[INFO] [stdout] test tests::test_result_work_success ... ok
[INFO] [stdout] test tests::test_sizeoftype_equal_sucess ... ok
[INFO] [stdout] test tests::test_str_work_success ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests vga_rs
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - (line 5) ... FAILED
[INFO] [stdout] test src/lib.rs - VgaChar::set_volatile (line 164) ... FAILED
[INFO] [stdout] test src/lib.rs - VgaBuffer::as_mut_slice (line 242) ... FAILED
[INFO] [stdout] test src/lib.rs - VgaChar::get_volatile (line 149) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 5) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:12:39
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut vga_buffer = VgaBuffer::new()
[INFO] [stdout]   |                                          ^ help: add `;` here
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |     --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error: expected expression, found `let` statement
[INFO] [stdout]  --> src/lib.rs:13:21
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: only supported directly in conditions of `if` and `while` expressions
[INFO] [stdout] 
[INFO] [stdout] error: expected a pattern, found a method call
[INFO] [stdout]  --> src/lib.rs:13:29
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^ method calls are not allowed in patterns
[INFO] [stdout] 
[INFO] [stdout] error: `mut` must be followed by a named binding
[INFO] [stdout]  --> src/lib.rs:13:25
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                            ^^^^ help: remove the `mut` prefix
[INFO] [stdout]   |
[INFO] [stdout]   = note: `mut` may be followed by `variable` and `variable @ pattern`
[INFO] [stdout] 
[INFO] [stdout] error: expected one of `.`, `=`, `?`, `|`, or an operator, found `;`
[INFO] [stdout]  --> src/lib.rs:13:54
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                                                         ^ expected one of `.`, `=`, `?`, `|`, or an operator
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `cursor_rs`
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate cursor_rs;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] error: `#[panic_handler]` function required, but not found
[INFO] [stdout] 
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `rust_out`
[INFO] [stdout]   --> src/lib.rs:20:2
[INFO] [stdout]    |
[INFO] [stdout] 16 | }
[INFO] [stdout]    |  ^ consider adding a `main` function to `src/lib.rs`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0463, E0601.
[INFO] [stdout] For more information about an error, try `rustc --explain E0463`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - VgaChar::set_volatile (line 164) stdout ----
[INFO] [stdout] error[E0412]: cannot find type `NonNull` in this scope
[INFO] [stdout]  --> src/lib.rs:165:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                 ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `VgaChar` in this scope
[INFO] [stdout]  --> src/lib.rs:165:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                           ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use vga_rs::VgaChar;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `NonNull`
[INFO] [stdout]  --> src/lib.rs:165:47
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                               ^^^^^^^ use of undeclared type `NonNull`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `VGA_PTR` in this scope
[INFO] [stdout]  --> src/lib.rs:165:70
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                                                      ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - VgaBuffer::as_mut_slice (line 242) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:243:38
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut vga_buffer = VgaBuffer::new()
[INFO] [stdout]   |                                      ^ help: add `;` here
[INFO] [stdout] 4 | let buffer_slice = vga_buffer.as_mut_slice();
[INFO] [stdout]   | --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `VgaBuffer`
[INFO] [stdout]  --> src/lib.rs:243:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut vga_buffer = VgaBuffer::new()
[INFO] [stdout]   |                      ^^^^^^^^^ use of undeclared type `VgaBuffer`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use vga_rs::VgaBuffer;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - VgaChar::get_volatile (line 149) stdout ----
[INFO] [stdout] error[E0412]: cannot find type `NonNull` in this scope
[INFO] [stdout]  --> src/lib.rs:150:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |             ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `VgaChar` in this scope
[INFO] [stdout]  --> src/lib.rs:150:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                       ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use vga_rs::VgaChar;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `NonNull`
[INFO] [stdout]  --> src/lib.rs:150:43
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                           ^^^^^^^ use of undeclared type `NonNull`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `VGA_PTR` in this scope
[INFO] [stdout]  --> src/lib.rs:150:66
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                                                  ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 5)
[INFO] [stdout]     src/lib.rs - VgaBuffer::as_mut_slice (line 242)
[INFO] [stdout]     src/lib.rs - VgaChar::get_volatile (line 149)
[INFO] [stdout]     src/lib.rs - VgaChar::set_volatile (line 164)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "0c83f0a48da560aa9f56f3a143373b9e043830297d5cb18ff966c5a42eb3aa64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c83f0a48da560aa9f56f3a143373b9e043830297d5cb18ff966c5a42eb3aa64", kill_on_drop: false }`
[INFO] [stdout] 0c83f0a48da560aa9f56f3a143373b9e043830297d5cb18ff966c5a42eb3aa64
[INFO] testing vga-rs-0.1.4 against try#b642703cf9526da1e72c0b6755753b939a9c6b6d for pr-125151
[INFO] extracting crate vga-rs 0.1.4 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate vga-rs 0.1.4 on toolchain b642703cf9526da1e72c0b6755753b939a9c6b6d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vga-rs 0.1.4
[INFO] finished tweaking crates.io crate vga-rs 0.1.4
[INFO] tweaked toml for crates.io crate vga-rs 0.1.4 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1487d8a3558f1d1b327e3a5c01cfca29b5fb53123ade9771cebb218a536a5e7e
[INFO] running `Command { std: "docker" "start" "-a" "1487d8a3558f1d1b327e3a5c01cfca29b5fb53123ade9771cebb218a536a5e7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1487d8a3558f1d1b327e3a5c01cfca29b5fb53123ade9771cebb218a536a5e7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1487d8a3558f1d1b327e3a5c01cfca29b5fb53123ade9771cebb218a536a5e7e", kill_on_drop: false }`
[INFO] [stdout] 1487d8a3558f1d1b327e3a5c01cfca29b5fb53123ade9771cebb218a536a5e7e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7060dd5e50e76ef4b157cf91592d65e07110646ef0d240d9e6635d944f959578
[INFO] running `Command { std: "docker" "start" "-a" "7060dd5e50e76ef4b157cf91592d65e07110646ef0d240d9e6635d944f959578", kill_on_drop: false }`
[INFO] [stderr]    Compiling vgainfo-rs v0.1.1
[INFO] [stderr]    Compiling vga-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "7060dd5e50e76ef4b157cf91592d65e07110646ef0d240d9e6635d944f959578", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7060dd5e50e76ef4b157cf91592d65e07110646ef0d240d9e6635d944f959578", kill_on_drop: false }`
[INFO] [stdout] 7060dd5e50e76ef4b157cf91592d65e07110646ef0d240d9e6635d944f959578
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7d436048961d7269c1cd47c176a97f6c231a22866ab25c44000ad1e1c934b020
[INFO] running `Command { std: "docker" "start" "-a" "7d436048961d7269c1cd47c176a97f6c231a22866ab25c44000ad1e1c934b020", kill_on_drop: false }`
[INFO] [stderr]    Compiling vga-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "7d436048961d7269c1cd47c176a97f6c231a22866ab25c44000ad1e1c934b020", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d436048961d7269c1cd47c176a97f6c231a22866ab25c44000ad1e1c934b020", kill_on_drop: false }`
[INFO] [stdout] 7d436048961d7269c1cd47c176a97f6c231a22866ab25c44000ad1e1c934b020
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d1fa15fc9b4326dc7237a51ff4000c945832cc6e047bca493e3ef4f07441122c
[INFO] running `Command { std: "docker" "start" "-a" "d1fa15fc9b4326dc7237a51ff4000c945832cc6e047bca493e3ef4f07441122c", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/vga_rs-413314c858c64151)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/basic.rs (/opt/rustwide/target/debug/deps/basic-ba917d3f6090f607)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test tests::test_option_work_success ... ok
[INFO] [stdout] test tests::test_integer_work_success ... ok
[INFO] [stdout] test tests::test_reference_work_success ... ok
[INFO] [stdout] test tests::test_float_work_success ... ok
[INFO] [stdout] test tests::test_result_work_success ... ok
[INFO] [stdout] test tests::test_sizeoftype_equal_sucess ... ok
[INFO] [stdout] test tests::test_str_work_success ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests vga_rs
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - (line 5) ... FAILED
[INFO] [stdout] test src/lib.rs - VgaChar::set_volatile (line 164) ... FAILED
[INFO] [stdout] test src/lib.rs - VgaBuffer::as_mut_slice (line 242) ... FAILED
[INFO] [stdout] test src/lib.rs - VgaChar::get_volatile (line 149) ... FAILED
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 5) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:12:39
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut vga_buffer = VgaBuffer::new()
[INFO] [stdout]   |                                          ^ help: add `;` here
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |     --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error: expected expression, found `let` statement
[INFO] [stdout]  --> src/lib.rs:13:21
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: only supported directly in conditions of `if` and `while` expressions
[INFO] [stdout] 
[INFO] [stdout] error: expected a pattern, found a method call
[INFO] [stdout]  --> src/lib.rs:13:29
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^ method calls are not allowed in patterns
[INFO] [stdout] 
[INFO] [stdout] error: `mut` must be followed by a named binding
[INFO] [stdout]  --> src/lib.rs:13:25
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                            ^^^^ help: remove the `mut` prefix
[INFO] [stdout]   |
[INFO] [stdout]   = note: `mut` may be followed by `variable` and `variable @ pattern`
[INFO] [stdout] 
[INFO] [stdout] error: expected one of `.`, `=`, `?`, `|`, or an operator, found `;`
[INFO] [stdout]  --> src/lib.rs:13:54
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let buffer_slice = let mut vga_buffer.as_mut_slice();
[INFO] [stdout]   |                                                         ^ expected one of `.`, `=`, `?`, `|`, or an operator
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `cursor_rs`
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate cursor_rs;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] error: `#[panic_handler]` function required, but not found
[INFO] [stdout] 
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `rust_out`
[INFO] [stdout]   --> src/lib.rs:20:2
[INFO] [stdout]    |
[INFO] [stdout] 16 | }
[INFO] [stdout]    |  ^ consider adding a `main` function to `src/lib.rs`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0463, E0601.
[INFO] [stdout] For more information about an error, try `rustc --explain E0463`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - VgaChar::set_volatile (line 164) stdout ----
[INFO] [stdout] error[E0412]: cannot find type `NonNull` in this scope
[INFO] [stdout]  --> src/lib.rs:165:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                 ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `VgaChar` in this scope
[INFO] [stdout]  --> src/lib.rs:165:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                           ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use vga_rs::VgaChar;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `NonNull`
[INFO] [stdout]  --> src/lib.rs:165:47
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                               ^^^^^^^ use of undeclared type `NonNull`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `VGA_PTR` in this scope
[INFO] [stdout]  --> src/lib.rs:165:70
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                                                      ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - VgaBuffer::as_mut_slice (line 242) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:243:38
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut vga_buffer = VgaBuffer::new()
[INFO] [stdout]   |                                      ^ help: add `;` here
[INFO] [stdout] 4 | let buffer_slice = vga_buffer.as_mut_slice();
[INFO] [stdout]   | --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `VgaBuffer`
[INFO] [stdout]  --> src/lib.rs:243:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | let mut vga_buffer = VgaBuffer::new()
[INFO] [stdout]   |                      ^^^^^^^^^ use of undeclared type `VgaBuffer`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use vga_rs::VgaBuffer;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - VgaChar::get_volatile (line 149) stdout ----
[INFO] [stdout] error[E0412]: cannot find type `NonNull` in this scope
[INFO] [stdout]  --> src/lib.rs:150:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |             ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `VgaChar` in this scope
[INFO] [stdout]  --> src/lib.rs:150:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                       ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 2 + use vga_rs::VgaChar;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `NonNull`
[INFO] [stdout]  --> src/lib.rs:150:43
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                           ^^^^^^^ use of undeclared type `NonNull`
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]   |
[INFO] [stdout] 2 + use core::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 2 + use std::ptr::NonNull;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `VGA_PTR` in this scope
[INFO] [stdout]  --> src/lib.rs:150:66
[INFO] [stdout]   |
[INFO] [stdout] 3 | let nonnull:NonNull::<VgaChar> = unsafe { NonNull::new_unchecked(VGA_PTR) };
[INFO] [stdout]   |                                                                  ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 5)
[INFO] [stdout]     src/lib.rs - VgaBuffer::as_mut_slice (line 242)
[INFO] [stdout]     src/lib.rs - VgaChar::get_volatile (line 149)
[INFO] [stdout]     src/lib.rs - VgaChar::set_volatile (line 164)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.07s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d1fa15fc9b4326dc7237a51ff4000c945832cc6e047bca493e3ef4f07441122c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1fa15fc9b4326dc7237a51ff4000c945832cc6e047bca493e3ef4f07441122c", kill_on_drop: false }`
[INFO] [stdout] d1fa15fc9b4326dc7237a51ff4000c945832cc6e047bca493e3ef4f07441122c
