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This works by introspecting rustc's error output, using the JSON format to determine whether it's a warning or error, then skipping it altogether if it's a summary of the diagnostics printed. Before: ``` src/main.rs:1:10: warning: trait objects without an explicit `dyn` are deprecated src/main.rs:1:1: error[E0601]: `main` function not found in crate `wrong` src/main.rs:1:9: error[E0038]: the trait `Clone` cannot be made into an object error: aborting due to 2 previous errors; 1 warning emitted error: could not compile `wrong` ``` After: ``` $ cargo check --message-format short src/main.rs:1:10: warning: trait objects without an explicit `dyn` are deprecated src/main.rs:1:1: error[E0601]: `main` function not found in crate `wrong` src/main.rs:1:9: error[E0038]: the trait `Clone` cannot be made into an object error: could not compile `wrong` due to 2 previous errors; 1 warning emitted ```