Proposed resolution (reviewed by CWG 2026-10-27, with low quorum):

Change in 5.13.2 [lex.icon] paragraph 1 as follows:

In an integer-literal,

• the sequence of binary-digits, octal-digits, digits, or hexadecimal-digits or
• the sequence of digits in an octal-literal or decimal-literal

is interpreted as a base N integer as shown in Table 7; the lexically first digit of the sequence of digits is the most significant.

(From submission #794.)

The octal integer literal 0 is not covered by the rule in 5.13.2 [lex.icon] paragraph 1.