prettyPrint method
Uses a rough approximation of reverse polish notation to render the parsed value of a FHIRPath in a more human readable way than verbosePrint, while still demonstrating how the expression was parsed and nested according to this package
Implementation
@override
String prettyPrint([int indent = 2]) => '(\n'
'${" " * indent}${value.prettyPrint(indent + 1)}\n'
'${indent <= 0 ? "" : " " * (indent - 1)})';