Parser

`sig
type token =
AMPERAMPER
| AMPERSAND
| AND
| AS
| ASSERT
| BACKQUOTE
| BANG
| BAR
| BARBAR
| BARRBRACKET
| BEGIN
| CHAR of char
| CLASS
| COLON
| COLONCOLON
| COLONEQUAL
| COLONGREATER
| COMMA
| CONSTRAINT
| DO
| DONE
| DOT
| DOTDOT
| DOWNTO
| ELSE
| END
| EOF
| EQUAL
| EXCEPTION
| EXTERNAL
| FALSE
| FLOAT of (string * char option)
| FOR
| FUN
| FUNCTION
| FUNCTOR
| GREATER
| GREATERRBRACE
| GREATERRBRACKET
| IF
| IN
| INCLUDE
| INFIXOP0 of string
| INFIXOP1 of string
| INFIXOP2 of string
| INFIXOP3 of string
| INFIXOP4 of string
| DOTOP of string
| INHERIT
| INITIALIZER
| INT of (string * char option)
| LABEL of string
| LAZY
| LBRACE
| LBRACELESS
| LBRACKET
| LBRACKETBAR
| LBRACKETLESS
| LBRACKETGREATER
| LBRACKETPERCENT
| LBRACKETPERCENTPERCENT
| LESS
| LESSMINUS
| LET
| LIDENT of string
| LPAREN
| LBRACKETAT
| LBRACKETATAT
| LBRACKETATATAT
| MATCH
| METHOD
| MINUS
| MINUSDOT
| MINUSGREATER
| MODULE
| MUTABLE
| NEW
| NONREC
| OBJECT
| OF
| OPEN
| OPTLABEL of string
| OR
| PERCENT
| PLUS
| PLUSDOT
| PLUSEQ
| PREFIXOP of string
| PRIVATE
| QUESTION
| QUOTE
| RBRACE
| RBRACKET
| REC
| RPAREN
| SEMI
| SEMISEMI
| HASH
| HASHOP of string
| SIG
| STAR
| STRING of (string * string option)
| STRUCT
| THEN
| TILDE
| TO
| TRUE
| TRY
| TYPE
| UIDENT of string
| UNDERSCORE
| VAL
| VIRTUAL
| WHEN
| WHILE
| WITH
| COMMENT of (string * Location.t)
| DOCSTRING of Docstrings.docstring
| EOL
val implementation :
(Lexing.lexbuf -> Parser.token) -> Lexing.lexbuf -> Parsetree.structure
val interface :
(Lexing.lexbuf -> Parser.token) -> Lexing.lexbuf -> Parsetree.signature
val toplevel_phrase :
(Lexing.lexbuf -> Parser.token) ->
Lexing.lexbuf -> Parsetree.toplevel_phrase
val use_file :
(Lexing.lexbuf -> Parser.token) ->
Lexing.lexbuf -> Parsetree.toplevel_phrase list
val parse_core_type :
(Lexing.lexbuf -> Parser.token) -> Lexing.lexbuf -> Parsetree.core_type
val parse_expression :
(Lexing.lexbuf -> Parser.token) -> Lexing.lexbuf -> Parsetree.expression
val parse_pattern :
(Lexing.lexbuf -> Parser.token) -> Lexing.lexbuf -> Parsetree.pattern
end`