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.
@pragma("vm:entry-point") const FormatException([this.message = "", this.source, this.offset]);
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https://api.dart.dev/stable/2.5.0/dart-core/FormatException/FormatException.html