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import java.util.*;
// A common interface for linters that can check a single line of code
// Every Check will check for its own type of error on a single line of code.
public interface Check {
// Checks for this Check's error condition on this line with this line number.
// If an error exists on this line, returns an Optional with an Error present
// indicating an error occurred. If no errors are present, returns an empty Optional.
public Optional<Error> lint(String line, int lineNumber);
}
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