[INFO] crate buffoon 0.5.0 is already in cache
[INFO] testing buffoon-0.5.0 against 1.45.2 for beta-1.46-1
[INFO] extracting crate buffoon 0.5.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate buffoon 0.5.0 on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buffoon 0.5.0
[INFO] finished tweaking crates.io crate buffoon 0.5.0
[INFO] tweaked toml for crates.io crate buffoon 0.5.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6854210c7b950cc2ac1a143203264dd38e1ffba4657be64ec649868604e3e490
[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" "6854210c7b950cc2ac1a143203264dd38e1ffba4657be64ec649868604e3e490", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6854210c7b950cc2ac1a143203264dd38e1ffba4657be64ec649868604e3e490", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6854210c7b950cc2ac1a143203264dd38e1ffba4657be64ec649868604e3e490", kill_on_drop: false }`
[INFO] [stdout] 6854210c7b950cc2ac1a143203264dd38e1ffba4657be64ec649868604e3e490
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27ac8092c77f44277f0946fde83e37f46e11161a54395599b2211b2fb1ae6c4d
[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" "27ac8092c77f44277f0946fde83e37f46e11161a54395599b2211b2fb1ae6c4d", kill_on_drop: false }`
[INFO] [stderr]    Compiling buffoon v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:38:28
[INFO] [stdout]    |
[INFO] [stdout] 38 |         if let Some(num) = try!(self.read_unsigned_varint()) {
[INFO] [stdout]    |                            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |         while let Some(byte) = try!(self.read_byte()) {
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |         if let Some(len) = try!(self.read_usize()) {
[INFO] [stdout]    |                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:88:27
[INFO] [stdout]    |
[INFO] [stdout] 88 |             if let None = try!(self.read_byte()) {
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 108 |                 let cnt = try!(self.reader.read(&mut buf[off..]));
[INFO] [stdout]     |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:127:17
[INFO] [stdout]     |
[INFO] [stdout] 127 |         if 1 == try!(self.reader.read(&mut buf)) {
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:149:34
[INFO] [stdout]     |
[INFO] [stdout] 149 |                 if let Some(_) = try!(self.input.read_unsigned_varint()) {
[INFO] [stdout]     |                                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:157:36
[INFO] [stdout]     |
[INFO] [stdout] 157 |                 if let Some(len) = try!(self.input.read_usize()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:158:31
[INFO] [stdout]     |
[INFO] [stdout] 158 |                     if len == try!(self.input.skip(len)) {
[INFO] [stdout]     |                               ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:174:36
[INFO] [stdout]     |
[INFO] [stdout] 174 |                 if let Some(val) = try!(self.input.read_u64()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:185:33
[INFO] [stdout]     |
[INFO] [stdout] 185 |         match String::from_utf8(try!(self.read_bytes())) {
[INFO] [stdout]     |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:194:36
[INFO] [stdout]     |
[INFO] [stdout] 194 |                 if let Some(val) = try!(self.input.read_length_delimited()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             try!(self.write_message_field(field, msg));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         try!(self.write_usize(val.len()));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |         try!(self.write_bytes(val));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |             try!(self.write_byte_field(field, val));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:44:24
[INFO] [stdout]    |
[INFO] [stdout] 44 |             Some(s) => try!(self.write_str_field(field, s.borrow())),
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 try!(self.write_byte(bits));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |             try!(self.write_byte(bits | 0x80));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         try!(self.write_usize(bits));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         try!(out.write_head(field, Varint));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |         try!(out.write_usize(self));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         try!(out.write_head(field, Varint));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |         try!(out.write_unsigned_varint(self));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         try!(self.writer.write(bytes));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             try!(self.write_usize(size));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             try!(msg.serialize(self));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         try!(msg.serialize(&mut out));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |         try!(msg.serialize(self));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:72:13
[INFO] [stdout]    |
[INFO] [stdout] 72 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:73:13
[INFO] [stdout]    |
[INFO] [stdout] 73 |             try!(self.write_usize(nested_size));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     try!(msg.serialize(&mut serializer));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:31:22
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let serializer = try!(serializer_for(msg));
[INFO] [stdout]    |                      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     try!(serializer.serialize_into(msg, &mut bytes));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/input_stream.rs:104:17
[INFO] [stdout]     |
[INFO] [stdout] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 37 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "27ac8092c77f44277f0946fde83e37f46e11161a54395599b2211b2fb1ae6c4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27ac8092c77f44277f0946fde83e37f46e11161a54395599b2211b2fb1ae6c4d", kill_on_drop: false }`
[INFO] [stdout] 27ac8092c77f44277f0946fde83e37f46e11161a54395599b2211b2fb1ae6c4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b0ec77f15c48dda940dbddde175d106b6e2607a217fed007c81c06e8a4d13c2
[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" "9b0ec77f15c48dda940dbddde175d106b6e2607a217fed007c81c06e8a4d13c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling buffoon v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:38:28
[INFO] [stdout]    |
[INFO] [stdout] 38 |         if let Some(num) = try!(self.read_unsigned_varint()) {
[INFO] [stdout]    |                            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |         while let Some(byte) = try!(self.read_byte()) {
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |         if let Some(len) = try!(self.read_usize()) {
[INFO] [stdout]    |                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:88:27
[INFO] [stdout]    |
[INFO] [stdout] 88 |             if let None = try!(self.read_byte()) {
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 108 |                 let cnt = try!(self.reader.read(&mut buf[off..]));
[INFO] [stdout]     |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:127:17
[INFO] [stdout]     |
[INFO] [stdout] 127 |         if 1 == try!(self.reader.read(&mut buf)) {
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:149:34
[INFO] [stdout]     |
[INFO] [stdout] 149 |                 if let Some(_) = try!(self.input.read_unsigned_varint()) {
[INFO] [stdout]     |                                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:157:36
[INFO] [stdout]     |
[INFO] [stdout] 157 |                 if let Some(len) = try!(self.input.read_usize()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:158:31
[INFO] [stdout]     |
[INFO] [stdout] 158 |                     if len == try!(self.input.skip(len)) {
[INFO] [stdout]     |                               ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:174:36
[INFO] [stdout]     |
[INFO] [stdout] 174 |                 if let Some(val) = try!(self.input.read_u64()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:185:33
[INFO] [stdout]     |
[INFO] [stdout] 185 |         match String::from_utf8(try!(self.read_bytes())) {
[INFO] [stdout]     |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:194:36
[INFO] [stdout]     |
[INFO] [stdout] 194 |                 if let Some(val) = try!(self.input.read_length_delimited()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             try!(self.write_message_field(field, msg));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         try!(self.write_usize(val.len()));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |         try!(self.write_bytes(val));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |             try!(self.write_byte_field(field, val));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:44:24
[INFO] [stdout]    |
[INFO] [stdout] 44 |             Some(s) => try!(self.write_str_field(field, s.borrow())),
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 try!(self.write_byte(bits));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |             try!(self.write_byte(bits | 0x80));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         try!(self.write_usize(bits));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         try!(out.write_head(field, Varint));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |         try!(out.write_usize(self));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         try!(out.write_head(field, Varint));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |         try!(out.write_unsigned_varint(self));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         try!(self.writer.write(bytes));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             try!(self.write_usize(size));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             try!(msg.serialize(self));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         try!(msg.serialize(&mut out));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |         try!(msg.serialize(self));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:72:13
[INFO] [stdout]    |
[INFO] [stdout] 72 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:73:13
[INFO] [stdout]    |
[INFO] [stdout] 73 |             try!(self.write_usize(nested_size));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     try!(msg.serialize(&mut serializer));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:31:22
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let serializer = try!(serializer_for(msg));
[INFO] [stdout]    |                      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     try!(serializer.serialize_into(msg, &mut bytes));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/input_stream.rs:104:17
[INFO] [stdout]     |
[INFO] [stdout] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 37 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:38:28
[INFO] [stdout]    |
[INFO] [stdout] 38 |         if let Some(num) = try!(self.read_unsigned_varint()) {
[INFO] [stdout]    |                            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:58:32
[INFO] [stdout]    |
[INFO] [stdout] 58 |         while let Some(byte) = try!(self.read_byte()) {
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |         if let Some(len) = try!(self.read_usize()) {
[INFO] [stdout]    |                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/input_stream.rs:88:27
[INFO] [stdout]    |
[INFO] [stdout] 88 |             if let None = try!(self.read_byte()) {
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 108 |                 let cnt = try!(self.reader.read(&mut buf[off..]));
[INFO] [stdout]     |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:127:17
[INFO] [stdout]     |
[INFO] [stdout] 127 |         if 1 == try!(self.reader.read(&mut buf)) {
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:149:34
[INFO] [stdout]     |
[INFO] [stdout] 149 |                 if let Some(_) = try!(self.input.read_unsigned_varint()) {
[INFO] [stdout]     |                                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:157:36
[INFO] [stdout]     |
[INFO] [stdout] 157 |                 if let Some(len) = try!(self.input.read_usize()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:158:31
[INFO] [stdout]     |
[INFO] [stdout] 158 |                     if len == try!(self.input.skip(len)) {
[INFO] [stdout]     |                               ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:174:36
[INFO] [stdout]     |
[INFO] [stdout] 174 |                 if let Some(val) = try!(self.input.read_u64()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:185:33
[INFO] [stdout]     |
[INFO] [stdout] 185 |         match String::from_utf8(try!(self.read_bytes())) {
[INFO] [stdout]     |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/input_stream.rs:194:36
[INFO] [stdout]     |
[INFO] [stdout] 194 |                 if let Some(val) = try!(self.input.read_length_delimited()) {
[INFO] [stdout]     |                                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             try!(self.write_message_field(field, msg));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         try!(self.write_usize(val.len()));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |         try!(self.write_bytes(val));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |             try!(self.write_byte_field(field, val));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:44:24
[INFO] [stdout]    |
[INFO] [stdout] 44 |             Some(s) => try!(self.write_str_field(field, s.borrow())),
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 try!(self.write_byte(bits));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |             try!(self.write_byte(bits | 0x80));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_stream.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         try!(self.write_usize(bits));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         try!(out.write_head(field, Varint));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |         try!(out.write_usize(self));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         try!(out.write_head(field, Varint));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/output_stream.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |         try!(out.write_unsigned_varint(self));
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         try!(self.writer.write(bytes));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             try!(self.write_usize(size));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/output_writer.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |             try!(msg.serialize(self));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         try!(msg.serialize(&mut out));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |         try!(msg.serialize(self));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:72:13
[INFO] [stdout]    |
[INFO] [stdout] 72 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/serializer.rs:73:13
[INFO] [stdout]    |
[INFO] [stdout] 73 |             try!(self.write_usize(nested_size));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     try!(msg.serialize(&mut serializer));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:31:22
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let serializer = try!(serializer_for(msg));
[INFO] [stdout]    |                      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     try!(serializer.serialize_into(msg, &mut bytes));
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |             try!(out.write_str_field(1, "hello"));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/input_stream.rs:104:17
[INFO] [stdout]     |
[INFO] [stdout] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 38 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.90s
[INFO] running `Command { std: "docker" "inspect" "9b0ec77f15c48dda940dbddde175d106b6e2607a217fed007c81c06e8a4d13c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b0ec77f15c48dda940dbddde175d106b6e2607a217fed007c81c06e8a4d13c2", kill_on_drop: false }`
[INFO] [stdout] 9b0ec77f15c48dda940dbddde175d106b6e2607a217fed007c81c06e8a4d13c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6c2044b2c8b6f1252219817f0c418b34063eeb9d2c05195aa270d4e690d950af
[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" "6c2044b2c8b6f1252219817f0c418b34063eeb9d2c05195aa270d4e690d950af", kill_on_drop: false }`
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:38:28
[INFO] [stderr]    |
[INFO] [stderr] 38 |         if let Some(num) = try!(self.read_unsigned_varint()) {
[INFO] [stderr]    |                            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:58:32
[INFO] [stderr]    |
[INFO] [stderr] 58 |         while let Some(byte) = try!(self.read_byte()) {
[INFO] [stderr]    |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:76:28
[INFO] [stderr]    |
[INFO] [stderr] 76 |         if let Some(len) = try!(self.read_usize()) {
[INFO] [stderr]    |                            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:88:27
[INFO] [stderr]    |
[INFO] [stderr] 88 |             if let None = try!(self.read_byte()) {
[INFO] [stderr]    |                           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:108:27
[INFO] [stderr]     |
[INFO] [stderr] 108 |                 let cnt = try!(self.reader.read(&mut buf[off..]));
[INFO] [stderr]     |                           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:127:17
[INFO] [stderr]     |
[INFO] [stderr] 127 |         if 1 == try!(self.reader.read(&mut buf)) {
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:149:34
[INFO] [stderr]     |
[INFO] [stderr] 149 |                 if let Some(_) = try!(self.input.read_unsigned_varint()) {
[INFO] [stderr]     |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:157:36
[INFO] [stderr]     |
[INFO] [stderr] 157 |                 if let Some(len) = try!(self.input.read_usize()) {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:158:31
[INFO] [stderr]     |
[INFO] [stderr] 158 |                     if len == try!(self.input.skip(len)) {
[INFO] [stderr]     |                               ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:174:36
[INFO] [stderr]     |
[INFO] [stderr] 174 |                 if let Some(val) = try!(self.input.read_u64()) {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:185:33
[INFO] [stderr]     |
[INFO] [stderr] 185 |         match String::from_utf8(try!(self.read_bytes())) {
[INFO] [stderr]     |                                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:194:36
[INFO] [stderr]     |
[INFO] [stderr] 194 |                 if let Some(val) = try!(self.input.read_length_delimited()) {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |             try!(self.write_message_field(field, msg));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |         try!(self.write_head(field, LengthDelimited));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |         try!(self.write_usize(val.len()));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |         try!(self.write_bytes(val));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |             try!(self.write_byte_field(field, val));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:44:24
[INFO] [stderr]    |
[INFO] [stderr] 44 |             Some(s) => try!(self.write_str_field(field, s.borrow())),
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:78:17
[INFO] [stderr]    |
[INFO] [stderr] 78 |                 try!(self.write_byte(bits));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:82:13
[INFO] [stderr]    |
[INFO] [stderr] 82 |             try!(self.write_byte(bits | 0x80));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |         try!(self.write_usize(bits));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |         try!(out.write_head(field, Varint));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         try!(out.write_usize(self));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |         try!(out.write_head(field, Varint));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:109:9
[INFO] [stderr]     |
[INFO] [stderr] 109 |         try!(out.write_unsigned_varint(self));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |         try!(self.writer.write(bytes));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:39:13
[INFO] [stderr]    |
[INFO] [stderr] 39 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |             try!(self.write_usize(size));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:42:13
[INFO] [stderr]    |
[INFO] [stderr] 42 |             try!(msg.serialize(self));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |         try!(msg.serialize(&mut out));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         try!(msg.serialize(self));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |             try!(self.write_usize(nested_size));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     try!(msg.serialize(&mut serializer));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:31:22
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let serializer = try!(serializer_for(msg));
[INFO] [stderr]    |                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     try!(serializer.serialize_into(msg, &mut bytes));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |             try!(out.write_str_field(1, "hello"));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/input_stream.rs:104:17
[INFO] [stderr]     |
[INFO] [stderr] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[INFO] [stderr]     |                 ----^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 38 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:38:28
[INFO] [stderr]    |
[INFO] [stderr] 38 |         if let Some(num) = try!(self.read_unsigned_varint()) {
[INFO] [stderr]    |                            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:58:32
[INFO] [stderr]    |
[INFO] [stderr] 58 |         while let Some(byte) = try!(self.read_byte()) {
[INFO] [stderr]    |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:76:28
[INFO] [stderr]    |
[INFO] [stderr] 76 |         if let Some(len) = try!(self.read_usize()) {
[INFO] [stderr]    |                            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/input_stream.rs:88:27
[INFO] [stderr]    |
[INFO] [stderr] 88 |             if let None = try!(self.read_byte()) {
[INFO] [stderr]    |                           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:108:27
[INFO] [stderr]     |
[INFO] [stderr] 108 |                 let cnt = try!(self.reader.read(&mut buf[off..]));
[INFO] [stderr]     |                           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:127:17
[INFO] [stderr]     |
[INFO] [stderr] 127 |         if 1 == try!(self.reader.read(&mut buf)) {
[INFO] [stderr]     |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:149:34
[INFO] [stderr]     |
[INFO] [stderr] 149 |                 if let Some(_) = try!(self.input.read_unsigned_varint()) {
[INFO] [stderr]     |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:157:36
[INFO] [stderr]     |
[INFO] [stderr] 157 |                 if let Some(len) = try!(self.input.read_usize()) {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:158:31
[INFO] [stderr]     |
[INFO] [stderr] 158 |                     if len == try!(self.input.skip(len)) {
[INFO] [stderr]     |                               ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:174:36
[INFO] [stderr]     |
[INFO] [stderr] 174 |                 if let Some(val) = try!(self.input.read_u64()) {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:185:33
[INFO] [stderr]     |
[INFO] [stderr] 185 |         match String::from_utf8(try!(self.read_bytes())) {
[INFO] [stderr]     |                                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/input_stream.rs:194:36
[INFO] [stderr]     |
[INFO] [stderr] 194 |                 if let Some(val) = try!(self.input.read_length_delimited()) {
[INFO] [stderr]     |                                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |             try!(self.write_message_field(field, msg));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |         try!(self.write_head(field, LengthDelimited));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |         try!(self.write_usize(val.len()));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |         try!(self.write_bytes(val));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |             try!(self.write_byte_field(field, val));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:44:24
[INFO] [stderr]    |
[INFO] [stderr] 44 |             Some(s) => try!(self.write_str_field(field, s.borrow())),
[INFO] [stderr]    |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:78:17
[INFO] [stderr]    |
[INFO] [stderr] 78 |                 try!(self.write_byte(bits));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:82:13
[INFO] [stderr]    |
[INFO] [stderr] 82 |             try!(self.write_byte(bits | 0x80));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_stream.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |         try!(self.write_usize(bits));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |         try!(out.write_head(field, Varint));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         try!(out.write_usize(self));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |         try!(out.write_head(field, Varint));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/output_stream.rs:109:9
[INFO] [stderr]     |
[INFO] [stderr] 109 |         try!(out.write_unsigned_varint(self));
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |         try!(self.writer.write(bytes));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:39:13
[INFO] [stderr]    |
[INFO] [stderr] 39 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |             try!(self.write_usize(size));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/output_writer.rs:42:13
[INFO] [stderr]    |
[INFO] [stderr] 42 |             try!(msg.serialize(self));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |         try!(msg.serialize(&mut out));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         try!(msg.serialize(self));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 |             try!(self.write_head(field, LengthDelimited));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serializer.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |             try!(self.write_usize(nested_size));
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     try!(msg.serialize(&mut serializer));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:31:22
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let serializer = try!(serializer_for(msg));
[INFO] [stderr]    |                      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     try!(serializer.serialize_into(msg, &mut bytes));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/input_stream.rs:104:17
[INFO] [stderr]     |
[INFO] [stderr] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[INFO] [stderr]     |                 ----^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 37 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/buffoon-d1bfabaae8cd1e18
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test input_stream::test::test_reading_empty_stream ... ok
[INFO] [stdout] test input_stream::test::test_skipping_string_field ... ok
[INFO] [stdout] test input_stream::test::test_reading_incorrect_type_from_field ... ok
[INFO] [stdout] test input_stream::test::test_reading_twice_from_field ... ok
[INFO] [stdout] test input_stream::test::test_reading_multi_byte_usize ... ok
[INFO] [stdout] test input_stream::test::test_reading_sequential_fields ... ok
[INFO] [stdout] test input_stream::test::test_reading_single_byte_usize ... ok
[INFO] [stdout] test input_stream::test::test_reading_string ... ok
[INFO] [stdout] test test::test_writing_simple_message ... ok
[INFO] [stderr]    Doc-tests buffoon
[INFO] [stdout] test input_stream::test::test_reading_multi_byte_tag_field ... ok
[INFO] [stdout] test test::test_writing_unit_struct ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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 `Command { std: "docker" "inspect" "6c2044b2c8b6f1252219817f0c418b34063eeb9d2c05195aa270d4e690d950af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c2044b2c8b6f1252219817f0c418b34063eeb9d2c05195aa270d4e690d950af", kill_on_drop: false }`
[INFO] [stdout] 6c2044b2c8b6f1252219817f0c418b34063eeb9d2c05195aa270d4e690d950af