Ruby version of an Index error case (https://ericlippert.com/2019/01/18/indexer-error-cases/)

index_error_cases.rb

# A Ruby implementation to confirm when assignments happen.
# Inspired by https://ericlippert.com/2019/01/18/indexer-error-cases/

# Prints
# A
# B
# C
# catch

def a
  puts 'A'
  []
end

def b
  puts 'B'
  'aaaaa'
end

def c
  puts 'C'
  123
end

begin
  a()[b()] = c
rescue
  puts 'catch'
end