Alan Mackenzie <acm@muc.de> writes:

>> Write a multi-line raw string literal in c++-mode, and font
>> lock doesn't show the correct syntax highlighting. Sample code:
>
>> const char* s1 = R"foo(
>> Hello
>> World
>> )foo";
>
>> const char* s2 = R"(
>> Hello
>> World
>> )";
>
> Yes.  Thank you for reporting this bug.  I'm working on fixing it, and
> hope to commit a patch to master sometime in the next few days.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

Testing this in Emacs 28, I get: