Course of Raku / Objects, I/O, and exceptions / Exceptions / Exception objects / Exercises / Name the error

Solution: Name the error

Here is a possible solution to the task.

Code

sub risky {
    die 'sub failed';
}

{
    risky();

    CATCH {
        default {
            say .^name;
            say .message;
        }
    }
}

🦋 You can find the source code in the file name-the-error.raku.

Output

X::AdHoc
sub failed

Comments

1. The die happens inside risky, but the exception travels up to the caller. The CATCH in the block that called risky handles it, which is how error handling normally works: the failure and its handler need not be in the same routine.

2. A plain die with a string creates an X::AdHoc exception, which .^name reports, and .message returns the text that was passed to die.

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