[INFO] cloning repository https://github.com/krishna9358/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/krishna9358/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkrishna9358%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkrishna9358%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3bb2bf39cbb3e9a7cda1f0514ebcba25549233fc
[INFO] testing krishna9358/learning-rust against master#733b47ea4b1b86216f14ef56e49440c33933f230+rustflags=-Copt-level=3 for pr-138759-retry
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkrishna9358%2Flearning-rust" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/krishna9358/learning-rust
[INFO] finished tweaking git repo https://github.com/krishna9358/learning-rust
[INFO] tweaked toml for git repo https://github.com/krishna9358/learning-rust written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/krishna9358/learning-rust on toolchain 733b47ea4b1b86216f14ef56e49440c33933f230
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/krishna9358/learning-rust 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" "+733b47ea4b1b86216f14ef56e49440c33933f230" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b24e86e472a0eec8d0e7a83cec20654e4e6c855cb962a53fdd1fa3c006ca3fce
[INFO] running `Command { std: "docker" "start" "-a" "b24e86e472a0eec8d0e7a83cec20654e4e6c855cb962a53fdd1fa3c006ca3fce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b24e86e472a0eec8d0e7a83cec20654e4e6c855cb962a53fdd1fa3c006ca3fce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b24e86e472a0eec8d0e7a83cec20654e4e6c855cb962a53fdd1fa3c006ca3fce", kill_on_drop: false }`
[INFO] [stdout] b24e86e472a0eec8d0e7a83cec20654e4e6c855cb962a53fdd1fa3c006ca3fce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Copt-level=3" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a85af42c4a1aeed4ce845582039ac4079fb66de26149ae36ea0aec6fe2291f20
[INFO] running `Command { std: "docker" "start" "-a" "a85af42c4a1aeed4ce845582039ac4079fb66de26149ae36ea0aec6fe2291f20", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
[INFO] [stdout]    --> src/main.rs:211:1
[INFO] [stdout]     |
[INFO] [stdout] 211 | #[proc_macro]
[INFO] [stdout]     | ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `copy` in this scope
[INFO] [stdout]    --> src/main.rs:204:10
[INFO] [stdout]     |
[INFO] [stdout] 204 | #[derive(copy, clone)]
[INFO] [stdout]     |          ^^^^ help: a derive macro with a similar name exists (notice the capitalization): `Copy`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/marker.rs:469:1
[INFO] [stdout]     |
[INFO] [stdout]     = note: similarly named derive macro `Copy` defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find derive macro `clone` in this scope
[INFO] [stdout]    --> src/main.rs:204:16
[INFO] [stdout]     |
[INFO] [stdout] 204 | #[derive(copy, clone)]
[INFO] [stdout]     |                ^^^^^ help: a derive macro with a similar name exists (notice the capitalization): `Clone`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/clone.rs:225:1
[INFO] [stdout]     |
[INFO] [stdout]     = note: similarly named derive macro `Clone` defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `TokenStream` in this scope
[INFO] [stdout]    --> src/main.rs:212:20
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn my_macro(input: TokenStream) -> TokenStream{
[INFO] [stdout]     |                    ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `TokenStream` in this scope
[INFO] [stdout]    --> src/main.rs:212:36
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn my_macro(input: TokenStream) -> TokenStream{
[INFO] [stdout]     |                                    ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `say_hello`
[INFO] [stdout]    --> src/main.rs:194:14
[INFO] [stdout]     |
[INFO] [stdout] 194 | macro_rules! say_hello {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_macro`
[INFO] [stdout]    --> src/main.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn my_macro(input: TokenStream) -> TokenStream{
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:108:47
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let content : Result<String, Error> = read_to_string(  "file.txt");
[INFO] [stdout]     |                       ---------------------   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Result<String, std::io::Error>`, found `Result<String, Error>`
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       expected due to this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Result<String, Error>` and `Result<String, std::io::Error>` have similar names, but are actually distinct types
[INFO] [stdout] note: `Result<String, Error>` is defined in crate `core`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/result.rs:548:1
[INFO] [stdout] note: `Result<String, std::io::Error>` is defined in the current crate
[INFO] [stdout]    --> src/main.rs:161:1
[INFO] [stdout]     |
[INFO] [stdout] 161 | enum Result<T, E>{
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     match content{
[INFO] [stdout]     |           ------- this expression has type `Result<String, std::io::Error>`
[INFO] [stdout] 110 |         Ok(content) => println!("{}", content),
[INFO] [stdout]     |         ^^^^^^^^^^^ expected `Result<String, Error>`, found `Result<_, _>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `std::result::Result<_, _>` and `Result<String, std::io::Error>` have similar names, but are actually distinct types
[INFO] [stdout] note: `std::result::Result<_, _>` is defined in crate `core`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/result.rs:548:1
[INFO] [stdout] note: `Result<String, std::io::Error>` is defined in the current crate
[INFO] [stdout]    --> src/main.rs:161:1
[INFO] [stdout]     |
[INFO] [stdout] 161 | enum Result<T, E>{
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     match content{
[INFO] [stdout]     |           ------- this expression has type `Result<String, std::io::Error>`
[INFO] [stdout] 110 |         Ok(content) => println!("{}", content),
[INFO] [stdout] 111 |         Err(error) => println!("Error: {}", error)
[INFO] [stdout]     |         ^^^^^^^^^^ expected `Result<String, Error>`, found `Result<_, _>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `std::result::Result<_, _>` and `Result<String, std::io::Error>` have similar names, but are actually distinct types
[INFO] [stdout] note: `std::result::Result<_, _>` is defined in crate `core`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/result.rs:548:1
[INFO] [stdout] note: `Result<String, std::io::Error>` is defined in the current crate
[INFO] [stdout]    --> src/main.rs:161:1
[INFO] [stdout]     |
[INFO] [stdout] 161 | enum Result<T, E>{
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:154:23
[INFO] [stdout]     |
[INFO] [stdout] 154 | let x : Option<i32> = Some(5);
[INFO] [stdout]     |         -----------   ^^^^^^^ expected `Option<i32>`, found `Option<{integer}>`
[INFO] [stdout]     |         |
[INFO] [stdout]     |         expected due to this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `std::option::Option<{integer}>` and `Option<i32>` have similar names, but are actually distinct types
[INFO] [stdout] note: `std::option::Option<{integer}>` is defined in crate `core`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/option.rs:591:1
[INFO] [stdout] note: `Option<i32>` is defined in the current crate
[INFO] [stdout]    --> src/main.rs:147:1
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum Option<T>{
[INFO] [stdout]     | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:155:23
[INFO] [stdout]     |
[INFO] [stdout] 155 | let y : Option<i32> = None;
[INFO] [stdout]     |         -----------   ^^^^ expected `Option<i32>`, found `Option<_>`
[INFO] [stdout]     |         |
[INFO] [stdout]     |         expected due to this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `std::option::Option<_>` and `Option<i32>` have similar names, but are actually distinct types
[INFO] [stdout] note: `std::option::Option<_>` is defined in crate `core`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/option.rs:591:1
[INFO] [stdout] note: `Option<i32>` is defined in the current crate
[INFO] [stdout]    --> src/main.rs:147:1
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum Option<T>{
[INFO] [stdout]     | ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `Option<i32>` doesn't implement `Debug`
[INFO] [stdout]    --> src/main.rs:156:18
[INFO] [stdout]     |
[INFO] [stdout] 156 | println!("{:?}", x);
[INFO] [stdout]     |           ----   ^ `Option<i32>` cannot be formatted using `{:?}` because it doesn't implement `Debug`
[INFO] [stdout]     |           |
[INFO] [stdout]     |           required by this formatting parameter
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `Debug` is not implemented for `Option<i32>`
[INFO] [stdout]     = note: add `#[derive(Debug)]` to `Option<i32>` or manually `impl Debug for Option<i32>`
[INFO] [stdout]     = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider annotating `Option<i32>` with `#[derive(Debug)]`
[INFO] [stdout]     |
[INFO] [stdout] 147 + #[derive(Debug)]
[INFO] [stdout] 148 | enum Option<T>{
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `Option<i32>` doesn't implement `Debug`
[INFO] [stdout]    --> src/main.rs:157:18
[INFO] [stdout]     |
[INFO] [stdout] 157 | println!("{:?}", y);
[INFO] [stdout]     |           ----   ^ `Option<i32>` cannot be formatted using `{:?}` because it doesn't implement `Debug`
[INFO] [stdout]     |           |
[INFO] [stdout]     |           required by this formatting parameter
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `Debug` is not implemented for `Option<i32>`
[INFO] [stdout]     = note: add `#[derive(Debug)]` to `Option<i32>` or manually `impl Debug for Option<i32>`
[INFO] [stdout]     = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider annotating `Option<i32>` with `#[derive(Debug)]`
[INFO] [stdout]     |
[INFO] [stdout] 147 + #[derive(Debug)]
[INFO] [stdout] 148 | enum Option<T>{
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:169:16
[INFO] [stdout]     |
[INFO] [stdout] 167 | fn divide(a : i32, b : i32) -> Result<i32, String>{
[INFO] [stdout]     |                                ------------------- expected `Result<i32, String>` because of return type
[INFO] [stdout] 168 |     if b == 0{
[INFO] [stdout] 169 |         return Err(String::from("Cannot divide by zero"));
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Result<i32, String>`, found `Result<_, String>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `std::result::Result<_, String>` and `Result<i32, String>` have similar names, but are actually distinct types
[INFO] [stdout] note: `std::result::Result<_, String>` is defined in crate `core`
[INFO] [stdout]    --> /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/result.rs:548:1
[INFO] [stdout] note: `Result<i32, String>` is defined in the current crate
[INFO] [stdout]    --> src/main.rs:161:1
[INFO] [stdout]     |
[INFO] [stdout] 161 | enum Result<T, E>{
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `TokenStream`
[INFO] [stdout]    --> src/main.rs:213:12
[INFO] [stdout]     |
[INFO] [stdout] 213 |     return TokenStream::new();
[INFO] [stdout]     |            ^^^^^^^^^^^ use of undeclared type `TokenStream`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0308, E0412, E0433.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-programming` (bin "rust-programming") due to 14 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a85af42c4a1aeed4ce845582039ac4079fb66de26149ae36ea0aec6fe2291f20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a85af42c4a1aeed4ce845582039ac4079fb66de26149ae36ea0aec6fe2291f20", kill_on_drop: false }`
[INFO] [stdout] a85af42c4a1aeed4ce845582039ac4079fb66de26149ae36ea0aec6fe2291f20