statement
	executable-statement
	declaration

executable-statement
	expression ;
	compound-statement
	if ( expression ) statement
	if ( expression ) statement else statement
	while  ( expression ) statement
	do statement while ( expression ) ;
	for ( [ expression ]; [ expression ]; [ expression ] ) statement
	forall ( expression [ , expression ] in expression ) statement
	switch ( expression ) compound-statement
	case parser-evaluated-expression :
	default ;
	break ;
	continue ;
	return [ expression ] ;
	try statement onerror statement
	;

factor	integer-number
	character-code
	floating-point-number
	string
	regular-expression
	identifier
	NULL
	( expression )
	[ array expression-list  ]
	[ set expression-list ]
	[ struct [ : expression , ] assignment-list ]
	[ func function-body ]

expression-list	empty
	expression [ , ]
	expression , expression-list

assignment-list	empty
	assignment [ , ]
	assignment , assignment-list

assignment	struct-key =  expression

struct-key	identifier
	( expression )

function-body	( identifier-list ) compound-statement

identifier-list	empty
	identifier [  , ]
	identifier ,  identifier-list

primary-expression	factor  primary-operation...

primary-operation	[ expression ]
	. identifier
	. ( expression )
	-> identifier
	->  ( expression )
	( expression-list )

term	[ prefix-operator...] primary-expression [ postfix-operator... ]

prefix-operator	Any of:
	* & - + ! ~ ++ -- @ $

postfix-operator	Any of:
	++ --

expression	term
	expression infix-operator expression

infix-operator	Any of:
	* / %
	+ -
	>> <<
	< > <= >=
	== != ~ !~ ~~ ~~~
	&

	^
	|
	&&
	||
	:
	?
	= += -= *= /= %= >>= <<= &= ^= |= ~~= <=>
	,

simple-expression
	expression ;

compound-expression
	{ statement... }

if-statement
	if ( expression ) statement
	if ( expression ) statement else statement

while-statement
	while  ( expression ) statement

do-while-statement
	do statement while ( expression ) ;

for-statement
	for ( [ expression ]; [ expression ]; [ expression ] ) statement

forall-statement
	forall ( expression [ ,expression ] in expression ) statement

switch-statement
	switch ( expression ) compound-statement

switch-case
	case expression : ;
	default :

break-and-continue
	break ;
	continue ;

return-statement
	return [ expression ] ;

try-statement
	try  statement onerror statement

declaration	storage-class declaration-list ;
	storage-class identifier function-body

storage-class	extern
	static
	auto

declaration-list	identifier [ = expression ]
	declaration-list , identifier [ = expression ]