J.3.4 Characters
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).