> And I say "at least two problems" because it's assuming I haven't missed some other valid scenario for a single-colon to appear in an expression.

Here's another, a range-based for-loop in an immediately-invoked lambda:

    X"{ [&] { for (auto v : c) if (v) return *v; return s; }() }"

Or a switch-case statement in an immediately-invoked lambda would have single-colons as well.

-hadriel



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