[INFO] cloning repository https://github.com/magnesium-lang/scratch
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/magnesium-lang/scratch" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmagnesium-lang%2Fscratch", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmagnesium-lang%2Fscratch'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 126aac1e82f033f387cc4b0ed74ffc1e23a7797e
[INFO] checking magnesium-lang/scratch against try#81185c2d21df0ba45fd33e65bbdce76dc0d89bd9 for pr-139646
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmagnesium-lang%2Fscratch" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/magnesium-lang/scratch on toolchain 81185c2d21df0ba45fd33e65bbdce76dc0d89bd9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+81185c2d21df0ba45fd33e65bbdce76dc0d89bd9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/magnesium-lang/scratch
[INFO] finished tweaking git repo https://github.com/magnesium-lang/scratch
[INFO] tweaked toml for git repo https://github.com/magnesium-lang/scratch written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/magnesium-lang/scratch already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+81185c2d21df0ba45fd33e65bbdce76dc0d89bd9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+81185c2d21df0ba45fd33e65bbdce76dc0d89bd9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ffd29927349a59fd23efa88f7b160f1f2ae4b7550562e02de19d0a701871eb37
[INFO] running `Command { std: "docker" "start" "-a" "ffd29927349a59fd23efa88f7b160f1f2ae4b7550562e02de19d0a701871eb37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffd29927349a59fd23efa88f7b160f1f2ae4b7550562e02de19d0a701871eb37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffd29927349a59fd23efa88f7b160f1f2ae4b7550562e02de19d0a701871eb37", kill_on_drop: false }`
[INFO] [stdout] ffd29927349a59fd23efa88f7b160f1f2ae4b7550562e02de19d0a701871eb37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+81185c2d21df0ba45fd33e65bbdce76dc0d89bd9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 82ef6d7b48f81f37c83d1a3c69700c5e329a5e7b107c56b919ec2c130958778e
[INFO] running `Command { std: "docker" "start" "-a" "82ef6d7b48f81f37c83d1a3c69700c5e329a5e7b107c56b919ec2c130958778e", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]     Checking futures v0.1.29
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking move-test v0.1.0 (/opt/rustwide/workdir/move-test)
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking num_cpus v1.11.1
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking compose-test v0.1.0 (/opt/rustwide/workdir/compose-test)
[INFO] [stdout] error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
[INFO] [stdout]   --> compose-test/src/main.rs:43:6
[INFO] [stdout]    |
[INFO] [stdout] 43 | impl std::ops::FnOnce<String> for IO {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `FnOnce`
[INFO] [stdout]   --> /rustc/81185c2d21df0ba45fd33e65bbdce76dc0d89bd9/library/core/src/ops/function.rs:242:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0059]: type parameter to bare `FnMut` trait must be a tuple
[INFO] [stdout]   --> compose-test/src/main.rs:50:6
[INFO] [stdout]    |
[INFO] [stdout] 50 | impl std::ops::FnMut<String> for IO {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `FnMut`
[INFO] [stdout]   --> /rustc/81185c2d21df0ba45fd33e65bbdce76dc0d89bd9/library/core/src/ops/function.rs:163:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument
[INFO] [stdout]   --> compose-test/src/main.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     extern "rust-call" fn call_once(self, args: String) -> Self::Output {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument
[INFO] [stdout]   --> compose-test/src/main.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     extern "rust-call" fn call_mut(&mut self, args: String) -> Self::Output {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `String` is not a tuple
[INFO] [stdout]   --> compose-test/src/main.rs:52:24
[INFO] [stdout]    |
[INFO] [stdout] 52 |         self.call_once(args)
[INFO] [stdout]    |              --------- ^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout]    |              |
[INFO] [stdout]    |              required by a bound introduced by this call
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `call_once`
[INFO] [stdout]   --> /rustc/81185c2d21df0ba45fd33e65bbdce76dc0d89bd9/library/core/src/ops/function.rs:250:5
[INFO] [stdout] help: use a unary tuple instead
[INFO] [stdout]    |
[INFO] [stdout] 52 |         self.call_once((args,))
[INFO] [stdout]    |                        +    ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0059, E0277.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0059`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `compose-test` (bin "compose-test") due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
[INFO] [stdout]   --> compose-test/src/main.rs:43:6
[INFO] [stdout]    |
[INFO] [stdout] 43 | impl std::ops::FnOnce<String> for IO {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `FnOnce`
[INFO] [stdout]   --> /rustc/81185c2d21df0ba45fd33e65bbdce76dc0d89bd9/library/core/src/ops/function.rs:242:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0059]: type parameter to bare `FnMut` trait must be a tuple
[INFO] [stdout]   --> compose-test/src/main.rs:50:6
[INFO] [stdout]    |
[INFO] [stdout] 50 | impl std::ops::FnMut<String> for IO {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `FnMut`
[INFO] [stdout]   --> /rustc/81185c2d21df0ba45fd33e65bbdce76dc0d89bd9/library/core/src/ops/function.rs:163:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument
[INFO] [stdout]   --> compose-test/src/main.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     extern "rust-call" fn call_once(self, args: String) -> Self::Output {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument
[INFO] [stdout]   --> compose-test/src/main.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     extern "rust-call" fn call_mut(&mut self, args: String) -> Self::Output {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `String` is not a tuple
[INFO] [stdout]   --> compose-test/src/main.rs:52:24
[INFO] [stdout]    |
[INFO] [stdout] 52 |         self.call_once(args)
[INFO] [stdout]    |              --------- ^^^^ the trait `Tuple` is not implemented for `String`
[INFO] [stdout]    |              |
[INFO] [stdout]    |              required by a bound introduced by this call
[INFO] [stdout]    |
[INFO] [stdout] note: required by a bound in `call_once`
[INFO] [stdout]   --> /rustc/81185c2d21df0ba45fd33e65bbdce76dc0d89bd9/library/core/src/ops/function.rs:250:5
[INFO] [stdout] help: use a unary tuple instead
[INFO] [stdout]    |
[INFO] [stdout] 52 |         self.call_once((args,))
[INFO] [stdout]    |                        +    ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0059, E0277.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0059`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `compose-test` (bin "compose-test" test) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "82ef6d7b48f81f37c83d1a3c69700c5e329a5e7b107c56b919ec2c130958778e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82ef6d7b48f81f37c83d1a3c69700c5e329a5e7b107c56b919ec2c130958778e", kill_on_drop: false }`
[INFO] [stdout] 82ef6d7b48f81f37c83d1a3c69700c5e329a5e7b107c56b919ec2c130958778e