[INFO] cloning repository https://github.com/PaulGrandperrin/playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PaulGrandperrin/playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPaulGrandperrin%2Fplayground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPaulGrandperrin%2Fplayground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 572ff41ccdfa72771a37fd9ab89f37e9b5451041
[INFO] checking PaulGrandperrin/playground against try#72f88fc4e9458f89516a0b8b0868f3718aec5b47 for pr-74989
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPaulGrandperrin%2Fplayground" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PaulGrandperrin/playground on toolchain 72f88fc4e9458f89516a0b8b0868f3718aec5b47
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PaulGrandperrin/playground
[INFO] finished tweaking git repo https://github.com/PaulGrandperrin/playground
[INFO] tweaked toml for git repo https://github.com/PaulGrandperrin/playground written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/PaulGrandperrin/playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded color-backtrace v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 31bbf6aa5a49bcd58a152f5edf37a3626a4aa05f0eabcce94709acd0e66d2788
[INFO] running `Command { std: "docker" "start" "-a" "31bbf6aa5a49bcd58a152f5edf37a3626a4aa05f0eabcce94709acd0e66d2788", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "31bbf6aa5a49bcd58a152f5edf37a3626a4aa05f0eabcce94709acd0e66d2788", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31bbf6aa5a49bcd58a152f5edf37a3626a4aa05f0eabcce94709acd0e66d2788", kill_on_drop: false }`
[INFO] [stdout] 31bbf6aa5a49bcd58a152f5edf37a3626a4aa05f0eabcce94709acd0e66d2788
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+72f88fc4e9458f89516a0b8b0868f3718aec5b47" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ef85d0cbc7a7441d6b0fb2913b2d5b4f40e03ecfad289dac9c0cc7bde6840c4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2ef85d0cbc7a7441d6b0fb2913b2d5b4f40e03ecfad289dac9c0cc7bde6840c4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.55
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling cc v1.0.37
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling serde v1.0.91
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling backtrace v0.3.26
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]     Checking color-backtrace v0.1.3
[INFO] [stderr]     Checking num-rational v0.2.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling serde_derive v1.0.91
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking exitfailure v0.5.1
[INFO] [stderr]     Checking playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::BTreeMap`
[INFO] [stdout]  --> src/algorithm.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::BTreeMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Insert`
[INFO] [stdout]   --> src/algorithm.rs:12:62
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::non_volatile::object::tree::{BufferNode, Message, Insert};
[INFO] [stdout]    |                                                              ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::ConstObjType`
[INFO] [stdout]   --> src/algorithm.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     use crate::common::ConstObjType;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/algorithm.rs:302:20
[INFO] [stdout]     |
[INFO] [stdout] 302 |                 if (num_of_candidates_for_cur_child > BUF_SIZE) { // BIG TODO find a better heuristic
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::ConstObjType`
[INFO] [stdout]  --> src/context.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::common::ConstObjType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::non_volatile::object::object_type::ObjectType`
[INFO] [stdout]  --> src/context.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::non_volatile::object::object_type::ObjectType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `LeafNode`, `LeafType`, `NodeEntry`
[INFO] [stdout]  --> src/context.rs:6:41
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::non_volatile::object::tree::{LeafNode, LeafType, NodeEntry, Message, Insert};
[INFO] [stdout]   |                                         ^^^^^^^^  ^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> src/context.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/context.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/non_volatile/object/any_rc_object.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TryInto`
[INFO] [stdout]  --> src/non_volatile/object/any_rc_object.rs:7:29
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::convert::{TryFrom, TryInto};
[INFO] [stdout]   |                             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufMut`, `Buf`
[INFO] [stdout]  --> src/non_volatile/object/object_pointer.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | use bytes::{Buf, BufMut};
[INFO] [stdout]   |             ^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Cursor`
[INFO] [stdout]  --> src/non_volatile/object/object_pointer.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Cursor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::marker::PhantomData`
[INFO] [stdout]  --> src/non_volatile/object/tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::marker::PhantomData;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Deserializer`, `SeqAccess`, `Visitor`, `self`
[INFO] [stdout]  --> src/non_volatile/object/tree.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use serde::de::{self, Deserialize, Deserializer, SeqAccess, Visitor};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `SerializeStruct`, `Serialize`, `Serializer`
[INFO] [stdout]  --> src/non_volatile/object/tree.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde::ser::{Serialize, SerializeStruct, Serializer};
[INFO] [stdout]   |                  ^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/non_volatile/object/tree/internal_node.rs:45:42
[INFO] [stdout]    |
[INFO] [stdout] 45 |             _p: std::marker::PhantomData<(K)>,
[INFO] [stdout]    |                                          ^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/non_volatile/object/tree/buffer_node.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufMut`, `Buf`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use bytes::{Buf, BufMut};
[INFO] [stdout]   |             ^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `failure::format_err`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use failure::format_err;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Cursor`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Cursor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:79:31
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn process_sortedmap(sm: &mut SortedMap<&str, &str>) {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn SortedMap<&str, &str>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BTreeMap`
[INFO] [stdout]  --> src/algorithm.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::BTreeMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Insert`
[INFO] [stdout]   --> src/algorithm.rs:12:62
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::non_volatile::object::tree::{BufferNode, Message, Insert};
[INFO] [stdout]    |                                                              ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::ConstObjType`
[INFO] [stdout]   --> src/algorithm.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     use crate::common::ConstObjType;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/algorithm.rs:302:20
[INFO] [stdout]     |
[INFO] [stdout] 302 |                 if (num_of_candidates_for_cur_child > BUF_SIZE) { // BIG TODO find a better heuristic
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::ConstObjType`
[INFO] [stdout]  --> src/context.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::common::ConstObjType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::non_volatile::object::object_type::ObjectType`
[INFO] [stdout]  --> src/context.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::non_volatile::object::object_type::ObjectType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `LeafNode`, `LeafType`, `NodeEntry`
[INFO] [stdout]  --> src/context.rs:6:41
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::non_volatile::object::tree::{LeafNode, LeafType, NodeEntry, Message, Insert};
[INFO] [stdout]   |                                         ^^^^^^^^  ^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> src/context.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/context.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/non_volatile/object/any_rc_object.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TryInto`
[INFO] [stdout]  --> src/non_volatile/object/any_rc_object.rs:7:29
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::convert::{TryFrom, TryInto};
[INFO] [stdout]   |                             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufMut`, `Buf`
[INFO] [stdout]  --> src/non_volatile/object/object_pointer.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | use bytes::{Buf, BufMut};
[INFO] [stdout]   |             ^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Cursor`
[INFO] [stdout]  --> src/non_volatile/object/object_pointer.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Cursor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::marker::PhantomData`
[INFO] [stdout]  --> src/non_volatile/object/tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::marker::PhantomData;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Deserializer`, `SeqAccess`, `Visitor`, `self`
[INFO] [stdout]  --> src/non_volatile/object/tree.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use serde::de::{self, Deserialize, Deserializer, SeqAccess, Visitor};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `SerializeStruct`, `Serialize`, `Serializer`
[INFO] [stdout]  --> src/non_volatile/object/tree.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde::ser::{Serialize, SerializeStruct, Serializer};
[INFO] [stdout]   |                  ^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/non_volatile/object/tree/internal_node.rs:45:42
[INFO] [stdout]    |
[INFO] [stdout] 45 |             _p: std::marker::PhantomData<(K)>,
[INFO] [stdout]    |                                          ^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/non_volatile/object/tree/buffer_node.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufMut`, `Buf`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use bytes::{Buf, BufMut};
[INFO] [stdout]   |             ^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `failure::format_err`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use failure::format_err;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Cursor`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Cursor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/non_volatile/object/uberblock.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:79:31
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn process_sortedmap(sm: &mut SortedMap<&str, &str>) {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn SortedMap<&str, &str>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/main.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     return Ok(());
[INFO] [stdout]    |     ------------- any code following this expression is unreachable
[INFO] [stdout] 31 |     ctx.commit();
[INFO] [stdout]    |     ^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/main.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     return Ok(());
[INFO] [stdout]    |     ------------- any code following this expression is unreachable
[INFO] [stdout] 31 |     ctx.commit();
[INFO] [stdout]    |     ^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::ConstObjType`
[INFO] [stdout]  --> src/non_volatile/manager.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::common::ConstObjType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::ConstObjType`
[INFO] [stdout]  --> src/non_volatile/manager.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::common::ConstObjType;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `non_exhaustive` has been stable since 1.40.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     non_exhaustive,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `uniform_paths` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     uniform_paths,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `dbg_macro` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     dbg_macro,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `try_from` has been stable since 1.34.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     try_from,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: Trait bound impl Object: Object does not depend on any type or lifetime parameters
[INFO] [stdout]   --> src/algorithm.rs:23:26
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn new() -> impl Object {
[INFO] [stdout]    |                          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(trivial_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `non_exhaustive` has been stable since 1.40.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     non_exhaustive,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `FileBackend::write` that must be used
[INFO] [stdout]   --> src/non_volatile/manager.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |             nv_blk_dev.write(i * Uberblock::RAW_SIZE as u64, &ub_raw);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `FileBackend::write` that must be used
[INFO] [stdout]    --> src/non_volatile/manager.rs:104:9
[INFO] [stdout]     |
[INFO] [stdout] 104 |         self.nv_blk_dev.write(ub_offset, &ub_raw);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `uniform_paths` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     uniform_paths,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `FileBackend::write` that must be used
[INFO] [stdout]    --> src/non_volatile/manager.rs:167:9
[INFO] [stdout]     |
[INFO] [stdout] 167 |         nv_blk_dev.write(offset, &obj_raw);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `dbg_macro` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     dbg_macro,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `try_from` has been stable since 1.34.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     try_from,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', compiler/rustc_errors/src/lib.rs:961:13
[INFO] [stdout] warning: 33 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] stack backtrace:
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<<std::rc::Rc<impl non_volatile::object::any_rc_object::Object> as std::convert::TryFrom<non_volatile::object::any_rc_object::AnyRcObject>>::Error as std::fmt::Debug>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:34:52
[INFO] [stdout]    |
[INFO] [stdout] 34 |         <Rc<Self> as TryFrom<AnyRcObject>>::Error: Debug;
[INFO] [stdout]    |                                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<std::rc::Rc<impl non_volatile::object::any_rc_object::Object> as std::convert::TryFrom<non_volatile::object::any_rc_object::AnyRcObject>>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:33:19
[INFO] [stdout]    |
[INFO] [stdout] 33 |         Rc<Self>: TryFrom<AnyRcObject>,
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<std::rc::Rc<impl non_volatile::object::any_rc_object::Object> as std::marker::Sized>) on opaque type
[INFO] [stdout]     |
[INFO] [stdout]     = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<non_volatile::object::any_rc_object::AnyRcObject as std::convert::From<std::rc::Rc<impl non_volatile::object::any_rc_object::Object>>>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:32:22
[INFO] [stdout]    |
[INFO] [stdout] 32 |         AnyRcObject: From<Rc<Self>>,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<non_volatile::object::any_rc_object::AnyRcObject as std::marker::Sized>) on opaque type
[INFO] [stdout]     |
[INFO] [stdout]     = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<non_volatile::object::any_rc_object::AnyRcObject as std::convert::From<impl non_volatile::object::any_rc_object::Object>>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:31:77
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub trait Object = Serializable + ConstObjType + Default where AnyRcObject: From<Self>,
[INFO] [stdout]    |                                                                             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: Trait bound impl Object: Object does not depend on any type or lifetime parameters
[INFO] [stdout]   --> src/algorithm.rs:23:26
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn new() -> impl Object {
[INFO] [stdout]    |                          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(trivial_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `FileBackend::write` that must be used
[INFO] [stdout]   --> src/non_volatile/manager.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |             nv_blk_dev.write(i * Uberblock::RAW_SIZE as u64, &ub_raw);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `FileBackend::write` that must be used
[INFO] [stdout]    --> src/non_volatile/manager.rs:104:9
[INFO] [stdout]     |
[INFO] [stdout] 104 |         self.nv_blk_dev.write(ub_offset, &ub_raw);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `FileBackend::write` that must be used
[INFO] [stdout]    --> src/non_volatile/manager.rs:167:9
[INFO] [stdout]     |
[INFO] [stdout] 167 |         nv_blk_dev.write(offset, &obj_raw);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    0:     0x7f505b6d54b0 - std::backtrace_rs::backtrace::libunwind::trace::h452faf99f32e7c93
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]    1:     0x7f505b6d54b0 - std::backtrace_rs::backtrace::trace_unsynchronized::he40edc71437667a1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x7f505b6d54b0 - std::sys_common::backtrace::_print_fmt::h6c51d6ade71f46bf
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:79
[INFO] [stderr]    3:     0x7f505b6d54b0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3cd15d7003dec37a
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:58
[INFO] [stderr]    4:     0x7f505b743e4c - core::fmt::write::h1857a60b204f1b6a
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/core/src/fmt/mod.rs:1080
[INFO] [stderr]    5:     0x7f505b6c7887 - std::io::Write::write_fmt::hac61caff894c35ae
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/io/mod.rs:1517
[INFO] [stderr]    6:     0x7f505b6da190 - std::sys_common::backtrace::_print::haa2f390fb7957e3e
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:61
[INFO] [stderr]    7:     0x7f505b6da190 - std::sys_common::backtrace::print::h48c7cbbad9013bb1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:48
[INFO] [stderr]    8:     0x7f505b6da190 - std::panicking::default_hook::{{closure}}::h8b7ff05a31e71d55
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:208
[INFO] [stderr]    9:     0x7f505b6d9edc - std::panicking::default_hook::h2f00c78800d98e4c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:227
[INFO] [stderr]   10:     0x7f505bf56f58 - rustc_driver::report_ice::hd736bea9ad59b02a
[INFO] [stdout] warning: 33 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   11:     0x7f504f7c23f6 - <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call::h909f843b53e9992c
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<<std::rc::Rc<impl non_volatile::object::any_rc_object::Object> as std::convert::TryFrom<non_volatile::object::any_rc_object::AnyRcObject>>::Error as std::fmt::Debug>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:34:52
[INFO] [stdout]    |
[INFO] [stdout] 34 |         <Rc<Self> as TryFrom<AnyRcObject>>::Error: Debug;
[INFO] [stdout]    |                                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1056
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<std::rc::Rc<impl non_volatile::object::any_rc_object::Object> as std::convert::TryFrom<non_volatile::object::any_rc_object::AnyRcObject>>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:33:19
[INFO] [stdout]    |
[INFO] [stdout] 33 |         Rc<Self>: TryFrom<AnyRcObject>,
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   12:     0x7f504f7b37d5 - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}::had3fd405126d54e9
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<std::rc::Rc<impl non_volatile::object::any_rc_object::Object> as std::marker::Sized>) on opaque type
[INFO] [stdout]     |
[INFO] [stdout]     = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/proc_macro/src/bridge/client.rs:321
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<non_volatile::object::any_rc_object::AnyRcObject as std::convert::From<std::rc::Rc<impl non_volatile::object::any_rc_object::Object>>>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:32:22
[INFO] [stdout]    |
[INFO] [stdout] 32 |         AnyRcObject: From<Rc<Self>>,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', compiler/rustc_errors/src/lib.rs:961:13
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<non_volatile::object::any_rc_object::AnyRcObject as std::marker::Sized>) on opaque type
[INFO] [stdout]     |
[INFO] [stdout]     = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] stack backtrace:
[INFO] [stdout] error: internal compiler error: unexpected predicate TraitPredicate(<non_volatile::object::any_rc_object::AnyRcObject as std::convert::From<impl non_volatile::object::any_rc_object::Object>>) on opaque type
[INFO] [stdout]   --> src/non_volatile/object/any_rc_object.rs:31:77
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub trait Object = Serializable + ConstObjType + Default where AnyRcObject: From<Self>,
[INFO] [stdout]    |                                                                             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: delayed at compiler/rustc_ty/src/ty.rs:480:18
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   13:     0x7f505b6da938 - std::panicking::rust_panic_with_hook::h4eaa635e4694aef3
[INFO] [stderr]    0:     0x7f1f6b48e4b0 - std::backtrace_rs::backtrace::libunwind::trace::h452faf99f32e7c93
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:581
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]   14:     0x7f505b6da4e9 - std::panicking::begin_panic_handler::{{closure}}::hec242f1b136b5ff2
[INFO] [stderr]    1:     0x7f1f6b48e4b0 - std::backtrace_rs::backtrace::trace_unsynchronized::he40edc71437667a1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:484
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]   15:     0x7f505b6d591c - std::sys_common::backtrace::__rust_end_short_backtrace::h1f3cc383ee6c0374
[INFO] [stderr]    2:     0x7f1f6b48e4b0 - std::sys_common::backtrace::_print_fmt::h6c51d6ade71f46bf
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:153
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:79
[INFO] [stderr]   16:     0x7f505b6da4a9 - rust_begin_unwind
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:483
[INFO] [stderr]    3:     0x7f1f6b48e4b0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3cd15d7003dec37a
[INFO] [stderr]   17:     0x7f505b6da45b - std::panicking::begin_panic_fmt::hebfdcd945bbd27b1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:58
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:437
[INFO] [stderr]    4:     0x7f1f6b4fce4c - core::fmt::write::h1857a60b204f1b6a
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/core/src/fmt/mod.rs:1080
[INFO] [stderr]    5:     0x7f1f6b480887 - std::io::Write::write_fmt::hac61caff894c35ae
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/io/mod.rs:1517
[INFO] [stderr]    6:     0x7f1f6b493190 - std::sys_common::backtrace::_print::haa2f390fb7957e3e
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:61
[INFO] [stderr]    7:     0x7f1f6b493190 - std::sys_common::backtrace::print::h48c7cbbad9013bb1
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:48
[INFO] [stderr]    8:     0x7f1f6b493190 - std::panicking::default_hook::{{closure}}::h8b7ff05a31e71d55
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:208
[INFO] [stderr]    9:     0x7f1f6b492edc - std::panicking::default_hook::h2f00c78800d98e4c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:227
[INFO] [stderr]   10:     0x7f1f6bd0ff58 - rustc_driver::report_ice::hd736bea9ad59b02a
[INFO] [stderr]   11:     0x7f1f5f5793f6 - <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call::h909f843b53e9992c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1056
[INFO] [stderr]   12:     0x7f1f5f56a7d5 - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}::had3fd405126d54e9
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/proc_macro/src/bridge/client.rs:321
[INFO] [stderr]   13:     0x7f1f6b493938 - std::panicking::rust_panic_with_hook::h4eaa635e4694aef3
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:581
[INFO] [stderr]   18:     0x7f505ef1c001 - rustc_errors::HandlerInner::flush_delayed::h2c3aafbae684cfc4
[INFO] [stderr]   19:     0x7f505ef187e1 - <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop::h1d54a15167394493
[INFO] [stderr]   20:     0x7f505bedc086 - core::ptr::drop_in_place::hfd793d113e997faf
[INFO] [stderr]   14:     0x7f1f6b4934e9 - std::panicking::begin_panic_handler::{{closure}}::hec242f1b136b5ff2
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:484
[INFO] [stderr]   15:     0x7f1f6b48e91c - std::sys_common::backtrace::__rust_end_short_backtrace::h1f3cc383ee6c0374
[INFO] [stderr]   21:     0x7f505bedd3b6 - <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop::h5a91048a4a774455
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys_common/backtrace.rs:153
[INFO] [stderr]   22:     0x7f505bf141fd - core::ptr::drop_in_place::h3ca67d8903970ab2
[INFO] [stderr]   23:     0x7f505bf0c2bb - rustc_span::with_source_map::he52d2e0c6177f287
[INFO] [stderr]   16:     0x7f1f6b4934a9 - rust_begin_unwind
[INFO] [stderr]   24:     0x7f505bf7b848 - rustc_interface::interface::create_compiler_and_run::h80874578e642ac73
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:483
[INFO] [stderr]   25:     0x7f505bf5a3ca - scoped_tls::ScopedKey<T>::set::h7e0a01d39c8551cf
[INFO] [stderr]   17:     0x7f1f6b49345b - std::panicking::begin_panic_fmt::hebfdcd945bbd27b1
[INFO] [stderr]   26:     0x7f505bf69e97 - std::sys_common::backtrace::__rust_begin_short_backtrace::hd515bf0a4768efd9
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/panicking.rs:437
[INFO] [stderr]   27:     0x7f505bef61ee - core::ops::function::FnOnce::call_once{{vtable.shim}}::hc776a06d7e45ba64
[INFO] [stderr]   18:     0x7f1f6ecd5001 - rustc_errors::HandlerInner::flush_delayed::h2c3aafbae684cfc4
[INFO] [stderr]   19:     0x7f1f6ecd17e1 - <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop::h1d54a15167394493
[INFO] [stderr]   28:     0x7f505b6e9eda - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h12eb11286d55ef7c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1042
[INFO] [stderr]   20:     0x7f1f6bc95086 - core::ptr::drop_in_place::hfd793d113e997faf
[INFO] [stderr]   21:     0x7f1f6bc963b6 - <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop::h5a91048a4a774455
[INFO] [stderr]   29:     0x7f505b6e9eda - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h7a8834e2603fbb01
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1042
[INFO] [stderr]   22:     0x7f1f6bccd1fd - core::ptr::drop_in_place::h3ca67d8903970ab2
[INFO] [stderr]   23:     0x7f1f6bcc52bb - rustc_span::with_source_map::he52d2e0c6177f287
[INFO] [stderr]   30:     0x7f505b6e9eda - std::sys::unix::thread::Thread::new::thread_start::h0afd1709a500dd5c
[INFO] [stderr]   24:     0x7f1f6bd34848 - rustc_interface::interface::create_compiler_and_run::h80874578e642ac73
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys/unix/thread.rs:87
[INFO] [stderr]   25:     0x7f1f6bd133ca - scoped_tls::ScopedKey<T>::set::h7e0a01d39c8551cf
[INFO] [stderr]   31:     0x7f505b607609 - start_thread
[INFO] [stderr]   26:     0x7f1f6bd22e97 - std::sys_common::backtrace::__rust_begin_short_backtrace::hd515bf0a4768efd9
[INFO] [stderr]   27:     0x7f1f6bcaf1ee - core::ops::function::FnOnce::call_once{{vtable.shim}}::hc776a06d7e45ba64
[INFO] [stderr]   28:     0x7f1f6b4a2eda - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h12eb11286d55ef7c
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1042
[INFO] [stderr]   32:     0x7f505b51b103 - clone
[INFO] [stderr]   29:     0x7f1f6b4a2eda - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h7a8834e2603fbb01
[INFO] [stderr]   33:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] [stderr] error: internal compiler error: unexpected panic
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/alloc/src/boxed.rs:1042
[INFO] [stderr] 
[INFO] [stderr] note: the compiler unexpectedly panicked. this is a bug.
[INFO] [stderr] 
[INFO] [stderr] note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
[INFO] [stderr] 
[INFO] [stderr]   30:     0x7f1f6b4a2eda - std::sys::unix::thread::Thread::new::thread_start::h0afd1709a500dd5c
[INFO] [stderr] note: rustc 1.48.0-nightly (72f88fc4e 2020-09-04) running on x86_64-unknown-linux-gnu
[INFO] [stderr] 
[INFO] [stderr] note: compiler flags: -C embed-bitcode=no -C debuginfo=2
[INFO] [stderr] 
[INFO] [stderr] note: some of the compiler flags provided by cargo are hidden
[INFO] [stderr] 
[INFO] [stderr] query stack during panic:
[INFO] [stderr] end of query stack
[INFO] [stderr]                                at /rustc/72f88fc4e9458f89516a0b8b0868f3718aec5b47/library/std/src/sys/unix/thread.rs:87
[INFO] [stderr]   31:     0x7f1f6b3c0609 - start_thread
[INFO] [stderr]   32:     0x7f1f6b2d4103 - clone
[INFO] [stderr]   33:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] [stderr] error: internal compiler error: unexpected panic
[INFO] [stderr] 
[INFO] [stderr] note: the compiler unexpectedly panicked. this is a bug.
[INFO] [stderr] 
[INFO] [stderr] note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
[INFO] [stderr] 
[INFO] [stderr] note: rustc 1.48.0-nightly (72f88fc4e 2020-09-04) running on x86_64-unknown-linux-gnu
[INFO] [stderr] 
[INFO] [stderr] note: compiler flags: -C embed-bitcode=no -C debuginfo=2 --crate-type bin
[INFO] [stderr] 
[INFO] [stderr] note: some of the compiler flags provided by cargo are hidden
[INFO] [stderr] 
[INFO] [stderr] query stack during panic:
[INFO] [stderr] end of query stack
[INFO] [stderr] error: could not compile `playground`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2ef85d0cbc7a7441d6b0fb2913b2d5b4f40e03ecfad289dac9c0cc7bde6840c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ef85d0cbc7a7441d6b0fb2913b2d5b4f40e03ecfad289dac9c0cc7bde6840c4", kill_on_drop: false }`
[INFO] [stdout] 2ef85d0cbc7a7441d6b0fb2913b2d5b4f40e03ecfad289dac9c0cc7bde6840c4
