[INFO] cloning repository PaulGrandperrin/playground
[INFO] running `"git" "clone" "--bare" "git://github.com/PaulGrandperrin/playground.git" "work/cache/sources/gh/PaulGrandperrin/playground"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/PaulGrandperrin/playground'...
[INFO] running `"git" "clone" "work/cache/sources/gh/PaulGrandperrin/playground" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/PaulGrandperrin/playground"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/PaulGrandperrin/playground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/PaulGrandperrin/playground" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/PaulGrandperrin/playground"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/PaulGrandperrin/playground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 572ff41ccdfa72771a37fd9ab89f37e9b5451041
[INFO] sha for GitHub repo PaulGrandperrin/playground: 572ff41ccdfa72771a37fd9ab89f37e9b5451041
[INFO] validating manifest of PaulGrandperrin/playground on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of PaulGrandperrin/playground on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing PaulGrandperrin/playground
[INFO] finished frobbing PaulGrandperrin/playground
[INFO] frobbed toml for PaulGrandperrin/playground written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/PaulGrandperrin/playground/Cargo.toml
[INFO] started frobbing PaulGrandperrin/playground
[INFO] finished frobbing PaulGrandperrin/playground
[INFO] frobbed toml for PaulGrandperrin/playground written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/PaulGrandperrin/playground/Cargo.toml
[INFO] crate PaulGrandperrin/playground already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing PaulGrandperrin/playground against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/PaulGrandperrin/playground:/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=forbid" "-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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] 2b4e3b12dbaf8774205b912b72a7e75e77584fe4b1aece623f0afa44bcdff31d
[INFO] running `"docker" "start" "-a" "2b4e3b12dbaf8774205b912b72a7e75e77584fe4b1aece623f0afa44bcdff31d"`
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling backtrace v0.3.26
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling exitfailure v0.5.1
[INFO] [stderr]    Compiling color-backtrace v0.1.3
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::BTreeMap`
[INFO] [stderr]  --> src/algorithm.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::BTreeMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Insert`
[INFO] [stderr]   --> src/algorithm.rs:12:62
[INFO] [stderr]    |
[INFO] [stderr] 12 | use crate::non_volatile::object::tree::{BufferNode, Message, Insert};
[INFO] [stderr]    |                                                              ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common::ConstObjType`
[INFO] [stderr]   --> src/algorithm.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     use crate::common::ConstObjType;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/algorithm.rs:302:20
[INFO] [stderr]     |
[INFO] [stderr] 302 |                 if (num_of_candidates_for_cur_child > BUF_SIZE) { // BIG TODO find a better heuristic
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common::ConstObjType`
[INFO] [stderr]  --> src/context.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::common::ConstObjType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::non_volatile::object::object_type::ObjectType`
[INFO] [stderr]  --> src/context.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::non_volatile::object::object_type::ObjectType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `LeafNode`, `LeafType`, `NodeEntry`
[INFO] [stderr]  --> src/context.rs:6:41
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::non_volatile::object::tree::{LeafNode, LeafType, NodeEntry, Message, Insert};
[INFO] [stderr]   |                                         ^^^^^^^^  ^^^^^^^^  ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/context.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]   --> src/context.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::rc::Rc;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::borrow::Borrow`
[INFO] [stderr]  --> src/non_volatile/object/any_rc_object.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::borrow::Borrow;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TryInto`
[INFO] [stderr]  --> src/non_volatile/object/any_rc_object.rs:7:29
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::convert::{TryFrom, TryInto};
[INFO] [stderr]   |                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufMut`, `Buf`
[INFO] [stderr]  --> src/non_volatile/object/object_pointer.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 | use bytes::{Buf, BufMut};
[INFO] [stderr]   |             ^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Cursor`
[INFO] [stderr]  --> src/non_volatile/object/object_pointer.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Cursor;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::marker::PhantomData`
[INFO] [stderr]  --> src/non_volatile/object/tree.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::marker::PhantomData;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Deserialize`, `Deserializer`, `SeqAccess`, `Visitor`, `self`
[INFO] [stderr]  --> src/non_volatile/object/tree.rs:7:17
[INFO] [stderr]   |
[INFO] [stderr] 7 | use serde::de::{self, Deserialize, Deserializer, SeqAccess, Visitor};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `SerializeStruct`, `Serialize`, `Serializer`
[INFO] [stderr]  --> src/non_volatile/object/tree.rs:8:18
[INFO] [stderr]   |
[INFO] [stderr] 8 | use serde::ser::{Serialize, SerializeStruct, Serializer};
[INFO] [stderr]   |                  ^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/non_volatile/object/tree/buffer_node.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufMut`, `Buf`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | use bytes::{Buf, BufMut};
[INFO] [stderr]   |             ^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `failure::format_err`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use failure::format_err;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Cursor`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Cursor;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:79:31
[INFO] [stderr]    |
[INFO] [stderr] 79 | fn process_sortedmap(sm: &mut SortedMap<&str, &str>) {
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn SortedMap<&str, &str>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/main.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     ctx.commit();
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unreachable_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common::ConstObjType`
[INFO] [stderr]  --> src/non_volatile/manager.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use crate::common::ConstObjType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `uniform_paths` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     uniform_paths,
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `dbg_macro` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     dbg_macro,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `try_from` has been stable since 1.34.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     try_from,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: Trait bound impl non_volatile::object::any_rc_object::Object: non_volatile::object::any_rc_object::Object does not depend on any type or lifetime parameters
[INFO] [stderr]   --> src/algorithm.rs:23:26
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn new() -> impl Object {
[INFO] [stderr]    |                          ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `non_volatile::block_device::file_backend::FileBackend::write` that must be used
[INFO] [stderr]   --> src/non_volatile/manager.rs:50:13
[INFO] [stderr]    |
[INFO] [stderr] 50 |             nv_blk_dev.write(i * Uberblock::RAW_SIZE as u64, &ub_raw);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `non_volatile::block_device::file_backend::FileBackend::write` that must be used
[INFO] [stderr]    --> src/non_volatile/manager.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         self.nv_blk_dev.write(ub_offset, &ub_raw);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `non_volatile::block_device::file_backend::FileBackend::write` that must be used
[INFO] [stderr]    --> src/non_volatile/manager.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 |         nv_blk_dev.write(offset, &obj_raw);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.39s
[INFO] running `"docker" "inspect" "2b4e3b12dbaf8774205b912b72a7e75e77584fe4b1aece623f0afa44bcdff31d"`
[INFO] running `"docker" "rm" "-f" "2b4e3b12dbaf8774205b912b72a7e75e77584fe4b1aece623f0afa44bcdff31d"`
[INFO] [stdout] 2b4e3b12dbaf8774205b912b72a7e75e77584fe4b1aece623f0afa44bcdff31d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/PaulGrandperrin/playground:/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=forbid" "-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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 29590f2014f9dbdb53a3aa6d3ad83665aaa48b27eb80ae460bc03f2e36b5079d
[INFO] running `"docker" "start" "-a" "29590f2014f9dbdb53a3aa6d3ad83665aaa48b27eb80ae460bc03f2e36b5079d"`
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::BTreeMap`
[INFO] [stderr]  --> src/algorithm.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::BTreeMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Insert`
[INFO] [stderr]   --> src/algorithm.rs:12:62
[INFO] [stderr]    |
[INFO] [stderr] 12 | use crate::non_volatile::object::tree::{BufferNode, Message, Insert};
[INFO] [stderr]    |                                                              ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common::ConstObjType`
[INFO] [stderr]   --> src/algorithm.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     use crate::common::ConstObjType;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/algorithm.rs:302:20
[INFO] [stderr]     |
[INFO] [stderr] 302 |                 if (num_of_candidates_for_cur_child > BUF_SIZE) { // BIG TODO find a better heuristic
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common::ConstObjType`
[INFO] [stderr]  --> src/context.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::common::ConstObjType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::non_volatile::object::object_type::ObjectType`
[INFO] [stderr]  --> src/context.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::non_volatile::object::object_type::ObjectType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `LeafNode`, `LeafType`, `NodeEntry`
[INFO] [stderr]  --> src/context.rs:6:41
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::non_volatile::object::tree::{LeafNode, LeafType, NodeEntry, Message, Insert};
[INFO] [stderr]   |                                         ^^^^^^^^  ^^^^^^^^  ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/context.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]   --> src/context.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::rc::Rc;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::borrow::Borrow`
[INFO] [stderr]  --> src/non_volatile/object/any_rc_object.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::borrow::Borrow;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TryInto`
[INFO] [stderr]  --> src/non_volatile/object/any_rc_object.rs:7:29
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::convert::{TryFrom, TryInto};
[INFO] [stderr]   |                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufMut`, `Buf`
[INFO] [stderr]  --> src/non_volatile/object/object_pointer.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 | use bytes::{Buf, BufMut};
[INFO] [stderr]   |             ^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Cursor`
[INFO] [stderr]  --> src/non_volatile/object/object_pointer.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Cursor;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::marker::PhantomData`
[INFO] [stderr]  --> src/non_volatile/object/tree.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::marker::PhantomData;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Deserialize`, `Deserializer`, `SeqAccess`, `Visitor`, `self`
[INFO] [stderr]  --> src/non_volatile/object/tree.rs:7:17
[INFO] [stderr]   |
[INFO] [stderr] 7 | use serde::de::{self, Deserialize, Deserializer, SeqAccess, Visitor};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `SerializeStruct`, `Serialize`, `Serializer`
[INFO] [stderr]  --> src/non_volatile/object/tree.rs:8:18
[INFO] [stderr]   |
[INFO] [stderr] 8 | use serde::ser::{Serialize, SerializeStruct, Serializer};
[INFO] [stderr]   |                  ^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/non_volatile/object/tree/buffer_node.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufMut`, `Buf`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | use bytes::{Buf, BufMut};
[INFO] [stderr]   |             ^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `failure::format_err`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use failure::format_err;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Cursor`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Cursor;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/non_volatile/object/uberblock.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:79:31
[INFO] [stderr]    |
[INFO] [stderr] 79 | fn process_sortedmap(sm: &mut SortedMap<&str, &str>) {
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn SortedMap<&str, &str>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/main.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     ctx.commit();
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unreachable_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common::ConstObjType`
[INFO] [stderr]  --> src/non_volatile/manager.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use crate::common::ConstObjType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `uniform_paths` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     uniform_paths,
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `dbg_macro` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     dbg_macro,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `try_from` has been stable since 1.34.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     try_from,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: Trait bound impl non_volatile::object::any_rc_object::Object: non_volatile::object::any_rc_object::Object does not depend on any type or lifetime parameters
[INFO] [stderr]   --> src/algorithm.rs:23:26
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn new() -> impl Object {
[INFO] [stderr]    |                          ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `non_volatile::block_device::file_backend::FileBackend::write` that must be used
[INFO] [stderr]   --> src/non_volatile/manager.rs:50:13
[INFO] [stderr]    |
[INFO] [stderr] 50 |             nv_blk_dev.write(i * Uberblock::RAW_SIZE as u64, &ub_raw);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `non_volatile::block_device::file_backend::FileBackend::write` that must be used
[INFO] [stderr]    --> src/non_volatile/manager.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         self.nv_blk_dev.write(ub_offset, &ub_raw);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `non_volatile::block_device::file_backend::FileBackend::write` that must be used
[INFO] [stderr]    --> src/non_volatile/manager.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 |         nv_blk_dev.write(offset, &obj_raw);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.06s
[INFO] running `"docker" "inspect" "29590f2014f9dbdb53a3aa6d3ad83665aaa48b27eb80ae460bc03f2e36b5079d"`
[INFO] running `"docker" "rm" "-f" "29590f2014f9dbdb53a3aa6d3ad83665aaa48b27eb80ae460bc03f2e36b5079d"`
[INFO] [stdout] 29590f2014f9dbdb53a3aa6d3ad83665aaa48b27eb80ae460bc03f2e36b5079d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/PaulGrandperrin/playground:/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=forbid" "-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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "test" "--frozen"`
[INFO] [stdout] 307e0567f14ffe6002b9016ee3e4e34ee63a603a3314653605f5c3b3eb23a4c4
[INFO] running `"docker" "start" "-a" "307e0567f14ffe6002b9016ee3e4e34ee63a603a3314653605f5c3b3eb23a4c4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/playground-c23492546a660aed
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "307e0567f14ffe6002b9016ee3e4e34ee63a603a3314653605f5c3b3eb23a4c4"`
[INFO] running `"docker" "rm" "-f" "307e0567f14ffe6002b9016ee3e4e34ee63a603a3314653605f5c3b3eb23a4c4"`
[INFO] [stdout] 307e0567f14ffe6002b9016ee3e4e34ee63a603a3314653605f5c3b3eb23a4c4