# FormatException constructor

const FormatException([String message = "", dynamic source, int offset ])

Creates a new FormatException with an optional error `message`.

Optionally also supply the actual `source` with the incorrect format, and the `offset` in the format where a problem was detected.

## Implementation

    @pragma("vm:entry-point")
    const FormatException([this.message = "", this.source, this.offset]);