[INFO] updating cached repository https://github.com/francescofranze/gc3c
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 13e0f9aff7e04ab068230ec0d8d7c77b2b11e325
[INFO] testing francescofranze/gc3c against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffrancescofranze%2Fgc3c" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/francescofranze/gc3c on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/francescofranze/gc3c
[INFO] finished tweaking git repo https://github.com/francescofranze/gc3c
[INFO] tweaked toml for git repo https://github.com/francescofranze/gc3c written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/francescofranze/gc3c already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 0b6b66a0f033fabf609e991dca7ac7bcc20cacffb35aea5c4436e00dd5141175
[INFO] running `"docker" "start" "-a" "0b6b66a0f033fabf609e991dca7ac7bcc20cacffb35aea5c4436e00dd5141175"`
[INFO] [stderr]    Compiling gc3c v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(unsize)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(coerce_unsized)] 
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(allocator_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:196:20
[INFO] [stderr]     |
[INFO] [stderr] 196 |     whites: Vec<Gc<Mark>>,
[INFO] [stderr]     |                    ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:197:19
[INFO] [stderr]     |
[INFO] [stderr] 197 |     greys: Vec<Gc<Mark>>,
[INFO] [stderr]     |                   ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:198:20
[INFO] [stderr]     |
[INFO] [stderr] 198 |     blacks: Vec<Gc<Mark>>,
[INFO] [stderr]     |                    ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:199:19
[INFO] [stderr]     |
[INFO] [stderr] 199 |     roots: Vec<Gc<Mark>>,
[INFO] [stderr]     |                   ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:229:33
[INFO] [stderr]     |
[INFO] [stderr] 229 |     fn movec(&mut self, obj: Gc<Mark>, color: GcColor) {
[INFO] [stderr]     |                                 ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:237:35
[INFO] [stderr]     |
[INFO] [stderr] 237 |     fn remove(&mut self, obj: &Gc<Mark>) {
[INFO] [stderr]     |                                   ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:268:31
[INFO] [stderr]     |
[INFO] [stderr] 268 |     fn add(&mut self, obj: Gc<Mark>, color: GcColor) {
[INFO] [stderr]     |                               ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:302:34
[INFO] [stderr]     |
[INFO] [stderr] 302 |     fn mark_1(&mut self, obj: Gc<Mark>) {
[INFO] [stderr]     |                                  ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:308:37
[INFO] [stderr]     |
[INFO] [stderr] 308 |     fn mark_grey(&mut self, obj: Gc<Mark>) {
[INFO] [stderr]     |                                     ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:358:36
[INFO] [stderr]     |
[INFO] [stderr] 358 |     pub fn add_root(&self, obj: Gc<Mark>) {
[INFO] [stderr]     |                                    ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:367:35
[INFO] [stderr]     |
[INFO] [stderr] 367 |     pub fn rm_root(&self, obj: Gc<Mark>) {
[INFO] [stderr]     |                                   ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:397:33
[INFO] [stderr]     |
[INFO] [stderr] 397 |     pub fn new_ref(&self, o: Gc<Mark>, robj: Gc<Mark>) {
[INFO] [stderr]     |                                 ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:397:49
[INFO] [stderr]     |
[INFO] [stderr] 397 |     pub fn new_ref(&self, o: Gc<Mark>, robj: Gc<Mark>) {
[INFO] [stderr]     |                                                 ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:453:31
[INFO] [stderr]     |
[INFO] [stderr] 453 |         let mut it = Vec::<Gc<Mark>>::new();
[INFO] [stderr]     |                               ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:503:26
[INFO] [stderr]     |
[INFO] [stderr] 503 |     pub fn new_ref(o: Gc<Mark>, r: Gc<Mark>) {
[INFO] [stderr]     |                          ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:503:39
[INFO] [stderr]     |
[INFO] [stderr] 503 |     pub fn new_ref(o: Gc<Mark>, r: Gc<Mark>) {
[INFO] [stderr]     |                                       ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:528:27
[INFO] [stderr]     |
[INFO] [stderr] 528 |     pub fn add_root(o: Gc<Mark>) {
[INFO] [stderr]     |                           ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:534:26
[INFO] [stderr]     |
[INFO] [stderr] 534 |     pub fn rm_root(o: Gc<Mark>) {
[INFO] [stderr]     |                          ^^^^ help: use `dyn`: `dyn Mark`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `gc3c`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0b6b66a0f033fabf609e991dca7ac7bcc20cacffb35aea5c4436e00dd5141175"`
[INFO] running `"docker" "rm" "-f" "0b6b66a0f033fabf609e991dca7ac7bcc20cacffb35aea5c4436e00dd5141175"`
[INFO] [stdout] 0b6b66a0f033fabf609e991dca7ac7bcc20cacffb35aea5c4436e00dd5141175