Example of parsing invalid Indental source with Nodaire::Indental.

nodaire-invalid-source.rb

> require 'nodaire/indental'
# true

> source = <<~NDTL
  NAME
    KEY : VALUE
    key : duplicate
      wrong indent level
  NDTL

> doc = Nodaire::Indental.parse(source)

> doc.valid?
# false

> doc.errors.each { |e| warn e }
# Duplicate key on line 3
# No list specified on line 4

> doc = Nodaire::Indental.parse!(source)
# Traceback (most recent call last):
# [...]
# Nodaire::ParserError (Duplicate key on line 3)