Was thinking of a programming languages in which every string is a valid program.
What is the type of the string A->? or A-> where we used ? not to indicate a type but that any type could go there.
2026-03-26 16:07:01.1774541221
If the "string" $A \to B$ usually means the type of functions from $A$ to $B$ then what should the string $A\to ?$ mean?
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It's a little unclear precisely what you're asking, but you can consider $A \to (-)$ to be a type constructor $* \to *$ that takes a type $B$ and maps it to the type $A \to B$. Here $*$ represents the kind of types. This is possible in type theories like System F$\omega$ and programming languages like Haskell.