[INFO] cloning repository https://github.com/alekratz/file-lang
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alekratz/file-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falekratz%2Ffile-lang"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falekratz%2Ffile-lang'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fb4346b12ca23bac0146ff91112428fc718ac594
[INFO] checking alekratz/file-lang against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falekratz%2Ffile-lang" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alekratz/file-lang on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/alekratz/file-lang
[INFO] finished tweaking git repo https://github.com/alekratz/file-lang
[INFO] tweaked toml for git repo https://github.com/alekratz/file-lang written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/alekratz/file-lang already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 438bfa5b1d1039305059a34b1f9656ad0c6e31721df13bec3f58638c345c6e83
[INFO] running `"docker" "start" "-a" "438bfa5b1d1039305059a34b1f9656ad0c6e31721df13bec3f58638c345c6e83"`
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]     Checking backtrace-sys v0.1.31
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling snafu-derive v0.5.0
[INFO] [stderr]    Compiling derivative v1.0.3
[INFO] [stderr]     Checking backtrace v0.3.37
[INFO] [stderr]    Compiling quote v0.4.2
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]     Checking snafu v0.5.0
[INFO] [stderr]    Compiling proc-macro-error v0.2.6
[INFO] [stderr]    Compiling shrinkwraprs v0.2.1
[INFO] [stderr]    Compiling structopt-derive v0.3.1
[INFO] [stderr]     Checking structopt v0.3.1
[INFO] [stderr]     Checking file-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `span`
[INFO] [stderr]    --> src/compile/translate/ir_to_inst.rs:188:37
[INFO] [stderr]     |
[INFO] [stderr] 188 |             LValue::Access(Access { span, head, tail }) => {
[INFO] [stderr]     |                                     ^^^^ help: try ignoring the field: `span: _`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/vm/mod.rs:306:25
[INFO] [stderr]     |
[INFO] [stderr] 298 |                         let fun = if let Some(Value::Fun(value)) = self.deref_value(ctor_value) {
[INFO] [stderr]     |                                                                    ---- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 306 |                         self.call(&fun.clone(), args);
[INFO] [stderr]     |                         ^^^^       --- immutable borrow later used here
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         mutable borrow occurs here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `len`
[INFO] [stderr]   --> src/common/span.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     pub fn len(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `text`
[INFO] [stderr]   --> src/syn/lexer.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     pub fn text(&self) -> &'text str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `curr_text`
[INFO] [stderr]   --> src/syn/parser.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn curr_text(&self) -> &'text str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `text`
[INFO] [stderr]   --> src/syn/parser.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn text(&self) -> &'text str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `arity`
[INFO] [stderr]   --> src/vm/fun.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     pub fn arity(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `load_register`
[INFO] [stderr]    --> src/vm/fun.rs:150:5
[INFO] [stderr]     |
[INFO] [stderr] 150 |     pub fn load_register(&self, binding: &Binding) -> Option<CopyValue> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `CALL_NAME`
[INFO] [stderr]  --> src/vm/object.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub const CALL_NAME: &str = "__call__";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_name_binding`
[INFO] [stderr]   --> src/vm/pool.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn get_name_binding(&self, name: &str) -> Binding {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last_frame`
[INFO] [stderr]   --> src/vm/stack.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn last_frame(&self) -> Option<&StackFrame> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pool_mut`
[INFO] [stderr]   --> src/vm/store.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn pool_mut(&mut self) -> &mut Pool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free_heap`
[INFO] [stderr]   --> src/vm/store.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     pub fn free_heap(&mut self, ref_id: HeapRef) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `load_heap_mut`
[INFO] [stderr]   --> src/vm/store.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     pub fn load_heap_mut(&mut self, ref_id: HeapRef) -> &mut Value {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Heap`
[INFO] [stderr]   --> src/vm/value.rs:85:5
[INFO] [stderr]    |
[INFO] [stderr] 85 |     Heap(HeapRef),
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Const`
[INFO] [stderr]   --> src/vm/value.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     Const(ConstRef),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `stack_frame`
[INFO] [stderr]   --> src/vm/mod.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     pub fn stack_frame(&self) -> &StackFrame {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `span`
[INFO] [stderr]    --> src/compile/translate/ir_to_inst.rs:188:37
[INFO] [stderr]     |
[INFO] [stderr] 188 |             LValue::Access(Access { span, head, tail }) => {
[INFO] [stderr]     |                                     ^^^^ help: try ignoring the field: `span: _`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `span`
[INFO] [stderr]    --> src/compile/mod.rs:234:14
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let (span, head, tail) = flatten_bin_expr(expr);
[INFO] [stderr]     |              ^^^^ help: consider prefixing with an underscore: `_span`
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/vm/mod.rs:306:25
[INFO] [stderr]     |
[INFO] [stderr] 298 |                         let fun = if let Some(Value::Fun(value)) = self.deref_value(ctor_value) {
[INFO] [stderr]     |                                                                    ---- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 306 |                         self.call(&fun.clone(), args);
[INFO] [stderr]     |                         ^^^^       --- immutable borrow later used here
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         mutable borrow occurs here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `len`
[INFO] [stderr]   --> src/common/span.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     pub fn len(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `text`
[INFO] [stderr]   --> src/syn/lexer.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     pub fn text(&self) -> &'text str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `curr_text`
[INFO] [stderr]   --> src/syn/parser.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn curr_text(&self) -> &'text str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `text`
[INFO] [stderr]   --> src/syn/parser.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn text(&self) -> &'text str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `arity`
[INFO] [stderr]   --> src/vm/fun.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     pub fn arity(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `load_register`
[INFO] [stderr]    --> src/vm/fun.rs:150:5
[INFO] [stderr]     |
[INFO] [stderr] 150 |     pub fn load_register(&self, binding: &Binding) -> Option<CopyValue> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `CALL_NAME`
[INFO] [stderr]  --> src/vm/object.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub const CALL_NAME: &str = "__call__";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_name_binding`
[INFO] [stderr]   --> src/vm/pool.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn get_name_binding(&self, name: &str) -> Binding {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last_frame`
[INFO] [stderr]   --> src/vm/stack.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn last_frame(&self) -> Option<&StackFrame> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pool_mut`
[INFO] [stderr]   --> src/vm/store.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn pool_mut(&mut self) -> &mut Pool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `free_heap`
[INFO] [stderr]   --> src/vm/store.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     pub fn free_heap(&mut self, ref_id: HeapRef) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `load_heap_mut`
[INFO] [stderr]   --> src/vm/store.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     pub fn load_heap_mut(&mut self, ref_id: HeapRef) -> &mut Value {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Heap`
[INFO] [stderr]   --> src/vm/value.rs:85:5
[INFO] [stderr]    |
[INFO] [stderr] 85 |     Heap(HeapRef),
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Const`
[INFO] [stderr]   --> src/vm/value.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     Const(ConstRef),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `stack_frame`
[INFO] [stderr]   --> src/vm/mod.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     pub fn stack_frame(&self) -> &StackFrame {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 51.75s
[INFO] running `"docker" "inspect" "438bfa5b1d1039305059a34b1f9656ad0c6e31721df13bec3f58638c345c6e83"`
[INFO] running `"docker" "rm" "-f" "438bfa5b1d1039305059a34b1f9656ad0c6e31721df13bec3f58638c345c6e83"`
[INFO] [stdout] 438bfa5b1d1039305059a34b1f9656ad0c6e31721df13bec3f58638c345c6e83