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Exceptions
==========
The standard library provides the type `core.Exception`, which is the root class for all exceptions
in Storm. Each exception contains a *message*, and optionally also a *stack trace*. It has the
following members:
```stormdoc
@core.Exception
- .message(*)
- .stackTrace
- .saveTrace()
```
The `saveTrace` function returns the exception itself. This makes it convenient to add a stack trace
to an exception temporarily by modifying code like:
```bsstmt
throw MyException();
```
into:
```bsstmt
throw MyException().saveTrace();
```
Exception Categories
--------------------
The following exceptions are provided in the standard library:
- [stormname:core.RuntimeError] extends `Exception`
Depicts a runtime error from some part of the system. The following subclasses are provided:
- [stormname:core.GcError] extends `RuntimeError`
Thrown when the garbage collector detects an issue. Typically when available memory is low.
- [stormname:core.NumericError] extends `RuntimeError`
Thrown when a numeric operation failed.
- [stormname:core.DivisionByZero] extends `NumericError`
Thrown whenever division by zero is attempted.
- [stormname:core.MemoryAccessError] extends `RuntimeError`
Thrown when an invalid memory address was accessed.
- [stormname:core.InternalError] extends `RuntimeError`
Generic form of internal error.
- [stormname:core.AbstractFnCalled] extends `RuntimeError`
Thrown when an abstract function was called.
- [stormname:core.NotSupported] extends `Exception`
Thrown when an operation is not supported.
- [stormname:core.UsageError] extends `Exception`
Thrown when an interface is used incorrectly.
- [stormname:core.StrError] extends `Exception`
Errors from `core.Str`.
- [stormname:core.MapError] extends `Exception`
Errors from `core.Map` and `core.RefMap`.
- [stormname:core.SetError] extends `Exception`
Errors from `core.Set` and `core.RefSet`.
- [stormname:core.ArrayError] extends `Exception`
Errors from `core.Array`.
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