Class `std.variant.VariantException`

/** Thrown in three cases:

Name	Type	Description
`source`	`TypeInfo`	The `source` type in the conversion or comparison
`target`	`TypeInfo`	The `target` type in the conversion or comparison
`file`	`string`	The file name and `line` number of the D source code corresponding with where the error was thrown from.
`info`	`object.Throwable.TraceInfo`	The stack trace of where the error happened. This is an opaque `object` that can either be converted to `string`, or iterated over with `foreach` to extract the items in the stack trace (as strings).
`line`	`ulong`	The file name and `line` number of the D source code corresponding with where the error was thrown from.
`msg`	`string`	A message describing the error.
`next`	`Throwable`	A reference to the next error in the list. This is used when a new `Throwable` is thrown from inside a `catch` block. The originally caught `Exception` will be chained to the new `Throwable` via this field.

Name	Description
`factory`	Create instance of class specified by the fully qualified name `classname`. The class must either have no constructors or have a default constructor.
`opCmp`	Compare with another `Object` obj.
`opEquals`	Returns !=0 if this `object` does have the same contents as obj.
`toHash`	Compute hash function for `Object`.
`toString`	Overrides `Object.toString` and returns the error message. Internally this forwards to the `toString` overload that takes a sink delegate.
`toString`	The `Throwable` hierarchy uses a `toString` overload that takes a `sink` delegate to avoid GC allocations, which cannot be performed in certain error situations. Override this `toString` method to customize the error message.

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