)
Sets the objects in the range start inclusive to end exclusive
to the given fillValue.
An error occurs if start..end is not a valid range for this.
Source
/**
* Sets the objects in the range [start] inclusive to [end] exclusive
* to the given [fillValue].
*
* An error occurs if [start]..[end] is not a valid range for `this`.
*/
void fillRange(int start, int end, [E fillValue]);