pragma Wide_Character_Encoding (IDENTIFIER | CHARACTER_LITERAL);
This pragma specifies the wide character encoding to be used in program source text appearing subsequently. It is a configuration pragma, but may also be used at any point that a pragma is allowed, and it is permissible to have more than one such pragma in a file, allowing multiple encodings to appear within the same file.
The argument can be an identifier or a character literal. In the identifier
case, it is one of
BRACKETS. In the character literal
case it is correspondingly one of the characters `h', `u',
`s', `e', `8', or `b'.
Note that when the pragma is used within a file, it affects only the encoding within that file, and does not affect withed units, specs, or subunits.