[The number of bits in a byte (3.6).]
[The values of the members of the execution character set (5.2.1).]
[The unique value of the member of the execution character set produced
for each of the standard alphabetic escape sequences (5.2.2).]
[The value of a char object into which has been stored any
character other than a member of the basic execution character set (6.2.5).]
[Which of signed char or unsigned char has the same range,
representation, and behavior as "plain" char (6.2.5, 6.3.1.1).]
[The mapping of members of the source character set (in character
constants and string literals) to members of the execution character
set (6.4.4.4, 5.1.1.2).]
[The value of an integer character constant containing more than one
character or containing a character or escape sequence that does not map
to a single-byte execution character (6.4.4.4).]
[The value of a wide character constant containing more than one
multibyte character, or containing a multibyte character or escape
sequence not represented in the extended execution character set (6.4.4.4).]
[The current locale used to convert a wide character constant consisting
of a single multibyte character that maps to a member of the extended
execution character set into a corresponding wide character code (6.4.4.4).]
[The current locale used to convert a wide string literal into
corresponding wide character codes (6.4.5).]
[The value of a string literal containing a multibyte character or escape
sequence not represented in the execution character set (6.4.5).]
