verbosePrint method
To print the entire parsed FHIRPath expression, this includes ALL of the Parsers that are used in this package by the names used in this package. These are not always synonymous with the FHIRPath specification (although they usually are), and include some parser classes that were created for ease of evaluation but are not included at all as objects in the official spec. I'm generally going to recommend that you use prettyPrint instead
Implementation
@override
String verbosePrint(int indent) => '${" " * indent}ConvertsToBooleanParser';