Enter the following code into a new file:

/// Use g.
@deprecated
f() {}

main() {
  f();
}

Then hover over the invocation of 'f' in 'main'. The hover text tells you that 'f' is deprecated, but doesn't display the comment, which ideally includes information about what it is being replaced by. It would be nice to be able to get all of the relevant information, either by having the comment appear after the error text or having some way of cycling between different kinds of hover data.