[INFO] crate topdown-rs 0.3.3 is already in cache
[INFO] extracting crate topdown-rs 0.3.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/topdown-rs/0.3.3
[INFO] extracting crate topdown-rs 0.3.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/topdown-rs/0.3.3
[INFO] validating manifest of topdown-rs-0.3.3 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of topdown-rs-0.3.3 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing topdown-rs-0.3.3
[INFO] finished frobbing topdown-rs-0.3.3
[INFO] frobbed toml for topdown-rs-0.3.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/topdown-rs/0.3.3/Cargo.toml
[INFO] started frobbing topdown-rs-0.3.3
[INFO] finished frobbing topdown-rs-0.3.3
[INFO] frobbed toml for topdown-rs-0.3.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/topdown-rs/0.3.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing topdown-rs-0.3.3 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/topdown-rs/0.3.3:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 27c71d99cd292a04aa37bd85c9dd2330a28d31d76a14894e49cdce716e7a9f14
[INFO] running `"docker" "start" "-a" "27c71d99cd292a04aa37bd85c9dd2330a28d31d76a14894e49cdce716e7a9f14"`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling utf8-ranges v0.1.3
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling topdown-rs v0.3.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.57s
[INFO] running `"docker" "inspect" "27c71d99cd292a04aa37bd85c9dd2330a28d31d76a14894e49cdce716e7a9f14"`
[INFO] running `"docker" "rm" "-f" "27c71d99cd292a04aa37bd85c9dd2330a28d31d76a14894e49cdce716e7a9f14"`
[INFO] [stdout] 27c71d99cd292a04aa37bd85c9dd2330a28d31d76a14894e49cdce716e7a9f14
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/topdown-rs/0.3.3:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] f2874fb5b614551b83fe3a943325b163d6750364a478a5ae92cf912f0cf99029
[INFO] running `"docker" "start" "-a" "f2874fb5b614551b83fe3a943325b163d6750364a478a5ae92cf912f0cf99029"`
[INFO] [stderr]    Compiling topdown-rs v0.3.3 (/opt/crater/workdir)
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:342:32
[INFO] [stderr]     |
[INFO] [stderr] 342 |             "*" => (Box::new(|&: a:AST, b:AST| BinOp(MUL, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:343:32
[INFO] [stderr]     |
[INFO] [stderr] 343 |             "/" => (Box::new(|&: a:AST, b:AST| BinOp(DIV, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:344:32
[INFO] [stderr]     |
[INFO] [stderr] 344 |             "%" => (Box::new(|&: a:AST, b:AST| BinOp(MOD, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:353:32
[INFO] [stderr]     |
[INFO] [stderr] 353 |             "+" => (Box::new(|&: a:AST, b:AST| BinOp(ADD, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:354:32
[INFO] [stderr]     |
[INFO] [stderr] 354 |             "-" => (Box::new(|&: a:AST, b:AST| BinOp(SUB, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:355:33
[INFO] [stderr]     |
[INFO] [stderr] 355 |             "==" => (Box::new(|&: a:AST, b:AST| BinOp(EQ, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                 ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:356:33
[INFO] [stderr]     |
[INFO] [stderr] 356 |             "!=" => (Box::new(|&: a:AST, b:AST| BinOp(NE, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                 ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:357:32
[INFO] [stderr]     |
[INFO] [stderr] 357 |             ">" => (Box::new(|&: a:AST, b:AST| BinOp(GT, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:358:33
[INFO] [stderr]     |
[INFO] [stderr] 358 |             ">=" => (Box::new(|&: a:AST, b:AST| BinOp(GE, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                 ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:359:32
[INFO] [stderr]     |
[INFO] [stderr] 359 |             "<" => (Box::new(|&: a:AST, b:AST| BinOp(LT, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:360:33
[INFO] [stderr]     |
[INFO] [stderr] 360 |             "<=" => (Box::new(|&: a:AST, b:AST| BinOp(LE, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                 ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:369:33
[INFO] [stderr]     |
[INFO] [stderr] 369 |             "||" => (Box::new(|&: a:AST, b:AST| BinOp(LOR, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                 ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] error: expected argument name, found `:`
[INFO] [stderr]    --> examples/interpreter/parser.rs:370:33
[INFO] [stderr]     |
[INFO] [stderr] 370 |             "&&" => (Box::new(|&: a:AST, b:AST| BinOp(LAND, Box::new(a.clone()), Box::new(b.clone())))) as Box<Fn(AST, AST) -> AST>,
[INFO] [stderr]     |                                 ^ expected argument name
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `unstable`
[INFO] [stderr]  --> examples/interpreter/main.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allow(unstable)]
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unknown_lints)] on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::old_io`
[INFO] [stderr]  --> examples/interpreter/main.rs:8:10
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::old_io::File;
[INFO] [stderr]   |          ^^^^^^ could not find `old_io` in `std`
[INFO] [stderr] 
[INFO] [stderr] error: cannot find derive macro `Show` in this scope
[INFO] [stderr]   --> examples/interpreter/parser.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 | #[derive(Show, Clone)]
[INFO] [stderr]    |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find derive macro `Show` in this scope
[INFO] [stderr]   --> examples/interpreter/parser.rs:36:23
[INFO] [stderr]    |
[INFO] [stderr] 36 | #[derive(Clone, Copy, Show)]
[INFO] [stderr]    |                       ^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Path`
[INFO] [stderr]   --> examples/interpreter/main.rs:18:16
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let path = Path::new(a[1].clone());
[INFO] [stderr]    |                ^^^^ use of undeclared type or module `Path`
[INFO] [stderr] 
[INFO] [stderr] error[E0405]: cannot find trait `Show` in module `fmt`
[INFO] [stderr]   --> examples/interpreter/parser.rs:60:11
[INFO] [stderr]    |
[INFO] [stderr] 60 | impl fmt::Show for BinOps {
[INFO] [stderr]    |           ^^^^ not found in `fmt`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `range` in this scope
[INFO] [stderr]    --> examples/interpreter/interpreter.rs:453:26
[INFO] [stderr]     |
[INFO] [stderr] 453 |                 for i in range(0, r) {
[INFO] [stderr]     |                          ^^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `args` in module `os`
[INFO] [stderr]   --> examples/interpreter/main.rs:17:17
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let a = os::args();
[INFO] [stderr]    |                 ^^^^ not found in `os`
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]    |
[INFO] [stderr] 7  | use std::env::args;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> examples/interpreter/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> examples/interpreter/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(slicing_syntax)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> examples/interpreter/main.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(box_syntax)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `'a` is never used
[INFO] [stderr]   --> src/chainl.rs:54:15
[INFO] [stderr]    |
[INFO] [stderr] 54 |     struct Op<'a>;
[INFO] [stderr]    |               ^^ unused parameter
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing `'a` or using a marker such as `std::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `'a` is never used
[INFO] [stderr]   --> src/chainr.rs:47:15
[INFO] [stderr]    |
[INFO] [stderr] 47 |     struct Op<'a>;
[INFO] [stderr]    |               ^^ unused parameter
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing `'a` or using a marker such as `std::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 23 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0405, E0425, E0432, E0433, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0405`.
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0392`.
[INFO] [stderr] error: Could not compile `topdown-rs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: Could not compile `topdown-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f2874fb5b614551b83fe3a943325b163d6750364a478a5ae92cf912f0cf99029"`
[INFO] running `"docker" "rm" "-f" "f2874fb5b614551b83fe3a943325b163d6750364a478a5ae92cf912f0cf99029"`
[INFO] [stdout] f2874fb5b614551b83fe3a943325b163d6750364a478a5ae92cf912f0cf99029