[Voted into WP at October, 2009 meeting.]

Proposed resolution (September, 2009):

This issue is resolved by the resolution of issue 790.

According to 5.13.5 [lex.string] paragraph 4,

A string literal that does not begin with u8, u, U, or L is an ordinary string literal, and is initialized with the given characters.

This is not as clear as it could be that a string like u8R"[xxx]" is not an ordinary string literal, because the string's prefix is not one of those listed (i.e., it's not obvious that possible substrings of the prefix are in view). This would be clearer if it simply said,

A string literal with no prefix or a prefix of R is an ordinary string literal.