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This is when calling a function with a generic type parameter. The actual type parameter is inferred, so we can't name it, but there is a corresponding formal parameter we could name.
E.g., if calling foo<T>(...) we have foo(...) and so get a type error for _, but we could mention T here, something like
cannot infer type for `_`, the inferred type corresponding to `T` in this call to `foo`