On 08/07/2020 13.09, Alisdair Meredith via SG16 wrote:
> After taking another look over P2029 resolving a few core issues,
> I am further concerned by [lex.string]p11, which states (among
> other things) that concatenation of unicode string literals with
> different encoding-prefixes is conditionally supported with
> implementation-defined behavior. That seems a little to free for
> my tastes.

This is pre-existing and unchanged from the status quo.

[lex.string] p11
"Any other concatenations are conditionally-supported with implementation-defined behavior."

If you want a change here, it should be a separate paper.

Jens