FormatException const constructor
const FormatException(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.
Source
const FormatException([this.message = "", this.source, this.offset]);
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https://api.dartlang.org/stable/1.24.3/dart-core/FormatException/FormatException.html