Is "?:" still not a valid punctuation, or has it come into use? https://english.stackexchange.com/a/90994/443467 is when the question is short. What is the best replacement for this when the question is too long? For example, if the sentence is like this:
What is the problem with this code?:
What would be the best replacement for this when rewording, adding a line, replacing the 'this' to use 'above', 'below', 'following' or positional words etc., compromising the tone/emphasis, or just excluding the colon is not possible?