The System'To_Address
(System is the only permissible prefix)
denotes a function identical to
System.Storage_Elements.To_Address except that
it is a static attribute. This means that if its argument is
a static expression, then the result of the attribute is a
static expression. This means that such an expression can be
used in contexts (e.g. preelaborable packages) which require a
static expression and where the function call could not be used
(since the function call is always non-static, even if its
argument is static). The argument must be in the range
-(2**(m-1) .. 2**m-1, where m is the memory size
(typically 32 or 64). Negative values are intepreted in a
modular manner (e.g. -1 means the same as 16#FFFF_FFFF# on
a 32 bits machine).