[Feature]: `raise` keyword support proposal. (REP-6)

[Almas-Ali]

Is your feature request related to a problem? Please describe.
It will make Radon more powerful.

Describe the solution you'd like
A sample example.

try {
    1/0
}
catch as err {
    raise some error
}

Work List:

• Add raise keyword support.
• Add raisable errors.

Examples:

• ValueError
• TypeError
• KeyError
• IndexError
• MemoryError
• IOError
• NotImplementedError etc more...
• For making this multiple errors, we need to make a BaseError class that will be inherited by child classes to make new errors. Also custom (user defined) errors will be supported.

This issue will be edited for any future changes.

[Almas-Ali]

Converting this to a proposal. Radon Enhancement Proposal (REP-6)

[Almas-Ali]

Added raise keyword support. #135

[Almas-Ali]

Added raisable builtin in stdlib/radiation #140
This supports a list of error types.

[Almas-Ali]

Also user defined radiation errors are possible.

fun MyError(message=null) -> message

raise MyError
raise MyError("This is my error")

[Almas-Ali]

This ends up this REP for now. We don’t have OOP fully supported yet. We will move to OOP model in the future.