toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
if (isSynthesized) return "[synthesized code]";
if (isEOF) return "[EOF]";
final rowfmt = (row + 1).toString().padLeft(4);
final colfmt = (col + 1).toString().padRight(3);
return "[$rowfmt:$colfmt]";
}