NAME
	catch - catch errors

SYNOPSIS
	mixed catch(expr)

DESCRIPTION
	Evaluate 'expr'. If there is no error, 0 is returned. If there
	is a standard error, a string (with a leading '*') will be returned.
	The function throw(value) can also be used to immediately return
	 any value, except 0.

NOTA BENE
	The catch() is somewhat costly, and should not be used anywhere.
	 Rather, use it at places where an error would destroy consistency.

SEE ALSO
	throw