[INFO] fetching crate zub 0.3.14...
[INFO] testing zub-0.3.14 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-8
[INFO] extracting crate zub 0.3.14 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate zub 0.3.14
[INFO] finished tweaking crates.io crate zub 0.3.14
[INFO] tweaked toml for crates.io crate zub 0.3.14 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate zub 0.3.14 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate zub 0.3.14 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hashbrown v0.7.2
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[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c77631f8c7ab54be79e2155c6607f9bc20c14912cd3e3062b3c105b704a335ac
[INFO] running `Command { std: "docker" "start" "-a" "c77631f8c7ab54be79e2155c6607f9bc20c14912cd3e3062b3c105b704a335ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c77631f8c7ab54be79e2155c6607f9bc20c14912cd3e3062b3c105b704a335ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c77631f8c7ab54be79e2155c6607f9bc20c14912cd3e3062b3c105b704a335ac", kill_on_drop: false }`
[INFO] [stdout] c77631f8c7ab54be79e2155c6607f9bc20c14912cd3e3062b3c105b704a335ac
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1679d2f7bd521676233332b137f79025e921778a8f06e40c7e71c5b978e044dd
[INFO] running `Command { std: "docker" "start" "-a" "1679d2f7bd521676233332b137f79025e921778a8f06e40c7e71c5b978e044dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling ryu v1.0.4
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling im-rc v14.3.0
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]    Compiling thread-id v3.3.0
[INFO] [stderr]    Compiling hashbrown v0.7.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling bitmaps v2.1.0
[INFO] [stderr]    Compiling rand_xoshiro v0.4.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling ahash v0.3.3
[INFO] [stderr]    Compiling colored v1.9.3
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling sized-chunks v0.5.3
[INFO] [stderr]    Compiling serde_json v1.0.52
[INFO] [stderr]    Compiling serde_derive v1.0.106
[INFO] [stderr]    Compiling flame v0.2.2
[INFO] [stderr]    Compiling flamer v0.3.0
[INFO] [stderr]    Compiling zub v0.3.14 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #[macro_use] extern crate flamer;
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tag::*`
[INFO] [stdout]  --> src/vm/value/object.rs:1:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::super::gc::{ *, tag::*, trace::* };
[INFO] [stdout]   |                            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::compiler::CompileState`
[INFO] [stdout]   --> src/vm/vm.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use super::compiler::CompileState;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Trace` and `Tracer`
[INFO] [stdout]  --> src/vm/disassembler.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | use gc::trace::{ Trace, Tracer };
[INFO] [stdout]   |                  ^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `vec_drain_as_slice` has been stable since 1.46.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_drain_as_slice)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[macro_use]` attribute cannot be used on use statements
[INFO] [stdout]   --> src/vm/mod.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = help: `#[macro_use]` can be applied to crates, extern crates, and modules
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `Nil` is named the same as one of the variants of the type `vm::value::value::Variant`
[INFO] [stdout]    --> src/vm/vm.rs:572:13
[INFO] [stdout]     |
[INFO] [stdout] 572 |             Nil => HashVariant::Nil,
[INFO] [stdout]     |             ^^^ help: to match on the variant, qualify the path: `vm::value::value::Variant::Nil`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Nil`
[INFO] [stdout]    --> src/vm/vm.rs:572:13
[INFO] [stdout]     |
[INFO] [stdout] 572 |             Nil => HashVariant::Nil,
[INFO] [stdout]     |             ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `Nil`
[INFO] [stdout]     |
[INFO] [stdout] 572 |             vm::value::value::Variant::Nil => HashVariant::Nil,
[INFO] [stdout]     |             +++++++++++++++++++++++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 572 |             _Nil => HashVariant::Nil,
[INFO] [stdout]     |             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/compiler/compiler.rs:663:13
[INFO] [stdout]     |
[INFO] [stdout] 663 |             _ => panic!("not a constant")
[INFO] [stdout]     |             ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/compiler/compiler.rs:663:13
[INFO] [stdout]     |
[INFO] [stdout] 651 |             Nil     => self.emit(Op::Nil),
[INFO] [stdout]     |             --- matches some of the same values
[INFO] [stdout] 652 |             Boolean(b) => self.emit(if b { Op::True} else { Op::False } ),
[INFO] [stdout]     |             ---------- matches some of the same values
[INFO] [stdout] 653 |             Number(n) => self.emit_number_literal(n),
[INFO] [stdout]     |             --------- matches some of the same values
[INFO] [stdout] 654 |             String(ref s) => {
[INFO] [stdout]     |             ------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 663 |             _ => panic!("not a constant")
[INFO] [stdout]     |             ^ collectively making this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `set_dict_element`, `get_dict_element`, `set_list_element`, and `on_loop` are never used
[INFO] [stdout]    --> src/vm/vm.rs:487:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | impl VM {
[INFO] [stdout]     | ------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 487 |     fn set_dict_element(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 506 |     fn get_dict_element(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 541 |     fn set_list_element(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 649 |     fn on_loop(&mut self) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `invoke`, `class`, `get_property`, and `set_property` are never used
[INFO] [stdout]    --> src/vm/disassembler.rs:167:8
[INFO] [stdout]     |
[INFO] [stdout]  12 | impl<'c> Disassembler<'c> {
[INFO] [stdout]     | ------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 167 |     fn invoke(&mut self, arity: u8) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 214 |     fn class(&mut self, idx: u8) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 220 |     fn get_property(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 226 |     fn set_property(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `kind` is never read
[INFO] [stdout]   --> src/ir/types.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct TypeInfo {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 12 |     kind: Option<Type>
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TypeInfo` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `entry` is never read
[INFO] [stdout]    --> src/ir/ir.rs:207:5
[INFO] [stdout]     |
[INFO] [stdout] 205 | pub struct Program {
[INFO] [stdout]     |            ------- field in this struct
[INFO] [stdout] 206 |     data: HashMap<DataId, ExprNode>,
[INFO] [stdout] 207 |     entry: Option<DataId>
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Program` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `begin_scope` is never used
[INFO] [stdout]    --> src/compiler/compiler.rs:113:8
[INFO] [stdout]     |
[INFO] [stdout]  29 | impl CompileState {
[INFO] [stdout]     | ----------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 113 |     fn begin_scope(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/vm/value/value.rs:42:25
[INFO] [stdout]    |
[INFO] [stdout] 42 |                         mem::transmute::<f64, i64>(*f)
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 42 -                         mem::transmute::<f64, i64>(*f)
[INFO] [stdout] 42 +                         f64::to_bits(*f).cast_signed()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vm/value/value.rs:200:20
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn with<U>(&self, item: U) -> WithHeap<U> {
[INFO] [stdout]     |                    ^^^^^              ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn with<U>(&self, item: U) -> WithHeap<'_, U> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/vm/chunk.rs:86:22
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn constants(&self) -> Constants {
[INFO] [stdout]    |                      ^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn constants(&self) -> Constants<'_> {
[INFO] [stdout]    |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Nil` should have a snake case name
[INFO] [stdout]    --> src/vm/vm.rs:572:13
[INFO] [stdout]     |
[INFO] [stdout] 572 |             Nil => HashVariant::Nil,
[INFO] [stdout]     |             ^^^ help: convert the identifier to snake case: `nil`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/vm/gc/tag.rs:63:40
[INFO] [stdout]    |
[INFO] [stdout] 63 |             return Tag::Float(unsafe { ::std::mem::transmute(u) });
[INFO] [stdout]    |                                        ---------------------^^^
[INFO] [stdout]    |                                        |
[INFO] [stdout]    |                                        help: replace this with: `f64::from_bits`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `zub` (lib) due to 1 previous error; 18 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "1679d2f7bd521676233332b137f79025e921778a8f06e40c7e71c5b978e044dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1679d2f7bd521676233332b137f79025e921778a8f06e40c7e71c5b978e044dd", kill_on_drop: false }`
[INFO] [stdout] 1679d2f7bd521676233332b137f79025e921778a8f06e40c7e71c5b978e044dd
