happy: happy (Parser generator for Haskell)
happy:
happy: Happy is a parser generator system for Haskell, similar to the tool
happy: `yacc' for C.  Like `yacc', it takes a file containing an annotated
happy: BNF specification of a grammar and produces a Haskell module
happy: containing a parser for the grammar.
happy:
happy: https://haskell.org/happy/
happy:
happy:
happy: