[INFO] fetching crate topdown-rs 0.3.3...
[INFO] checking topdown-rs-0.3.3 against master#ff1737bb00913444173658b4e0b274fd79aabf66 for pr-132712-1
[INFO] extracting crate topdown-rs 0.3.3 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate topdown-rs 0.3.3 on toolchain ff1737bb00913444173658b4e0b274fd79aabf66
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate topdown-rs 0.3.3
[INFO] finished tweaking crates.io crate topdown-rs 0.3.3
[INFO] tweaked toml for crates.io crate topdown-rs 0.3.3 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[INFO] [stderr]       Adding regex v0.1.80 (available: v1.11.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dd6693b7a89f31025d6a4fd370e3e8677393c3aff77ecce1909ffe2438341a1b
[INFO] running `Command { std: "docker" "start" "-a" "dd6693b7a89f31025d6a4fd370e3e8677393c3aff77ecce1909ffe2438341a1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd6693b7a89f31025d6a4fd370e3e8677393c3aff77ecce1909ffe2438341a1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd6693b7a89f31025d6a4fd370e3e8677393c3aff77ecce1909ffe2438341a1b", kill_on_drop: false }`
[INFO] [stdout] dd6693b7a89f31025d6a4fd370e3e8677393c3aff77ecce1909ffe2438341a1b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7263805c2ff3a51613c1a620cf115673faa29a5b5b8dce684945c471e0158ccb
[INFO] running `Command { std: "docker" "start" "-a" "7263805c2ff3a51613c1a620cf115673faa29a5b5b8dce684945c471e0158ccb", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]     Checking regex-syntax v0.3.9
[INFO] [stderr]     Checking utf8-ranges v0.1.3
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]     Checking thread-id v2.0.0
[INFO] [stderr]     Checking thread_local v0.2.7
[INFO] [stderr]     Checking regex v0.1.80
[INFO] [stderr]     Checking topdown-rs v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0392]: lifetime parameter `'a` is never used
[INFO] [stdout]   --> src/chainl.rs:54:15
[INFO] [stdout]    |
[INFO] [stdout] 54 |     struct Op<'a>;
[INFO] [stdout]    |               ^^ unused lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0392]: lifetime parameter `'a` is never used
[INFO] [stdout]   --> src/chainr.rs:47:15
[INFO] [stdout]    |
[INFO] [stdout] 47 |     struct Op<'a>;
[INFO] [stdout]    |               ^^ unused lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/re.rs:54:33
[INFO] [stdout]    |
[INFO] [stdout] 54 |                 assert_eq!(c[0].as_slice(), "int");
[INFO] [stdout]    |                                 ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/re.rs:55:33
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 assert_eq!(c[1].as_slice(), "x");
[INFO] [stdout]    |                                 ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/re.rs:56:33
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 assert_eq!(c[2].as_slice(), "10");
[INFO] [stdout]    |                                 ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> examples/interpreter/main.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(box_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: replaced with `#[rustc_box]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/chainl.rs:73:60
[INFO] [stdout]    |
[INFO] [stdout] 73 |             return cs.accept(&re("[1-9][0-9]*")).map(|x| x.as_slice().parse().unwrap());
[INFO] [stdout]    |                                                            ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/chainr.rs:66:60
[INFO] [stdout]    |
[INFO] [stdout] 66 |             return cs.accept(&re("[1-9][0-9]*")).map(|x| x.as_slice().parse().unwrap());
[INFO] [stdout]    |                                                            ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:342:32
[INFO] [stdout]     |
[INFO] [stdout] 342 |             "*" => (Box::new(|&: a:AST, b:AST| BinOp(MUL, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:343:32
[INFO] [stdout]     |
[INFO] [stdout] 343 |             "/" => (Box::new(|&: a:AST, b:AST| BinOp(DIV, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:344:32
[INFO] [stdout]     |
[INFO] [stdout] 344 |             "%" => (Box::new(|&: a:AST, b:AST| BinOp(MOD, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:353:32
[INFO] [stdout]     |
[INFO] [stdout] 353 |             "+" => (Box::new(|&: a:AST, b:AST| BinOp(ADD, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:354:32
[INFO] [stdout]     |
[INFO] [stdout] 354 |             "-" => (Box::new(|&: a:AST, b:AST| BinOp(SUB, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:355:33
[INFO] [stdout]     |
[INFO] [stdout] 355 |             "==" => (Box::new(|&: a:AST, b:AST| BinOp(EQ, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                 ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:356:33
[INFO] [stdout]     |
[INFO] [stdout] 356 |             "!=" => (Box::new(|&: a:AST, b:AST| BinOp(NE, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                 ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:357:32
[INFO] [stdout]     |
[INFO] [stdout] 357 |             ">" => (Box::new(|&: a:AST, b:AST| BinOp(GT, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:358:33
[INFO] [stdout]     |
[INFO] [stdout] 358 |             ">=" => (Box::new(|&: a:AST, b:AST| BinOp(GE, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                 ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:359:32
[INFO] [stdout]     |
[INFO] [stdout] 359 |             "<" => (Box::new(|&: a:AST, b:AST| BinOp(LT, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:360:33
[INFO] [stdout]     |
[INFO] [stdout] 360 |             "<=" => (Box::new(|&: a:AST, b:AST| BinOp(LE, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                 ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:369:33
[INFO] [stdout]     |
[INFO] [stdout] 369 |             "||" => (Box::new(|&: a:AST, b:AST| BinOp(LOR, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                 ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected parameter name, found `:`
[INFO] [stdout]    --> examples/interpreter/parser.rs:370:33
[INFO] [stdout]     |
[INFO] [stdout] 370 |             "&&" => (Box::new(|&: a:AST, b:AST| BinOp(LAND, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stdout]     |                                 ^ expected parameter name
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/choice.rs:54:34
[INFO] [stdout]    |
[INFO] [stdout] 54 |             Succ(c) => assert!(c.as_slice() == "abc"),
[INFO] [stdout]    |                                  ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]    --> examples/interpreter/interpreter.rs:449:20
[INFO] [stdout]     |
[INFO] [stdout] 449 |                 Ok(box String_(s.clone()))
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]     |
[INFO] [stdout] 449 |                 Ok(Box::new(String_(s.clone())))
[INFO] [stdout]     |                    ~~~~~~~~~                  +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]    --> examples/interpreter/interpreter.rs:456:20
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ok(box String_(s.clone()))
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ok(Box::new(String_(s.clone())))
[INFO] [stdout]     |                    ~~~~~~~~~                  +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::old_io`
[INFO] [stdout]  --> examples/interpreter/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::old_io::File;
[INFO] [stdout]   |          ^^^^^^ could not find `old_io` in `std`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for reference `&String` in the current scope
[INFO] [stdout]   --> src/many1.rs:63:34
[INFO] [stdout]    |
[INFO] [stdout] 63 |                     x.push_str(i.as_slice());
[INFO] [stdout]    |                                  ^^^^^^^^ method not found in `&String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/skip.rs:46:37
[INFO] [stdout]    |
[INFO] [stdout] 46 |             Succ(r) => assert_eq!(r.as_slice(), "a"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/skip.rs:51:37
[INFO] [stdout]    |
[INFO] [stdout] 51 |             Succ(r) => assert_eq!(r.as_slice(), "b"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Show` in this scope
[INFO] [stdout]   --> examples/interpreter/parser.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | #[derive(Show, Clone)]
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `Show` in this scope
[INFO] [stdout]   --> examples/interpreter/parser.rs:36:23
[INFO] [stdout]    |
[INFO] [stdout] 36 | #[derive(Clone, Copy, Show)]
[INFO] [stdout]    |                       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/skip.rs:56:37
[INFO] [stdout]    |
[INFO] [stdout] 56 |             Succ(r) => assert_eq!(r.as_slice(), "c"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/skip.rs:61:37
[INFO] [stdout]    |
[INFO] [stdout] 61 |             Succ(r) => assert_eq!(r.as_slice(), "d"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0405]: cannot find trait `Show` in module `fmt`
[INFO] [stdout]   --> examples/interpreter/parser.rs:60:11
[INFO] [stdout]    |
[INFO] [stdout] 60 | impl fmt::Show for BinOps {
[INFO] [stdout]    |           ^^^^ not found in `fmt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `range` in this scope
[INFO] [stdout]    --> examples/interpreter/interpreter.rs:453:26
[INFO] [stdout]     |
[INFO] [stdout] 453 |                 for i in range(0, r) {
[INFO] [stdout]     |                          ^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]     |
[INFO] [stdout] 1   + use std::slice::range;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `args` in module `os`
[INFO] [stdout]   --> examples/interpreter/main.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let a = os::args();
[INFO] [stdout]    |                 ^^^^ not found in `os`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]    |
[INFO] [stdout] 7  + use std::env::args;
[INFO] [stdout]    |
[INFO] [stdout] help: if you import `args`, refer to it directly
[INFO] [stdout]    |
[INFO] [stdout] 17 -     let a = os::args();
[INFO] [stdout] 17 +     let a = args();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Path`
[INFO] [stdout]   --> examples/interpreter/main.rs:18:16
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let path = Path::new(a[1].clone());
[INFO] [stdout]    |                ^^^^ use of undeclared type `Path`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]    |
[INFO] [stdout] 7  + use std::path::Path;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/cond.rs:39:37
[INFO] [stdout]    |
[INFO] [stdout] 39 |             Succ(r) => assert_eq!(r.as_slice(), "b"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/cond.rs:51:37
[INFO] [stdout]    |
[INFO] [stdout] 51 |             Succ(r) => assert_eq!(r.as_slice(), "default"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/opt.rs:42:34
[INFO] [stdout]    |
[INFO] [stdout] 42 |             Succ(c) => assert!(c.as_slice() == "abc"),
[INFO] [stdout]    |                                  ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/opt.rs:54:34
[INFO] [stdout]    |
[INFO] [stdout] 54 |             Succ(c) => assert!(c.as_slice() == "opt"),
[INFO] [stdout]    |                                  ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0405, E0425, E0432, E0433, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0405`.
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/wrapper.rs:61:37
[INFO] [stdout]    |
[INFO] [stdout] 61 |             Succ(x) => assert_eq!(x.as_slice(), "xxx"),
[INFO] [stdout]    |                                     ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `topdown-rs` (example "interpreter") due to 23 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] Some errors have detailed explanations: E0392, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0392`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `topdown-rs` (lib test) due to 18 previous errors
[INFO] running `Command { std: "docker" "inspect" "7263805c2ff3a51613c1a620cf115673faa29a5b5b8dce684945c471e0158ccb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7263805c2ff3a51613c1a620cf115673faa29a5b5b8dce684945c471e0158ccb", kill_on_drop: false }`
[INFO] [stdout] 7263805c2ff3a51613c1a620cf115673faa29a5b5b8dce684945c471e0158ccb