Callee returns the named target of a function call, if any: a function, method, builtin, or variable.

Dependencies returns all dependencies of the specified packages.

Dereference returns a pointer's element type; otherwise it returns T.

DereferenceR returns a pointer's element type; otherwise it returns T.

FlattenFields recursively flattens T and embedded structs, returning a list of fields.

IntuitiveMethodSet returns the intuitive method set of a type T, which is the set of methods you can call on an addressable value of that type.

OPT(dh): IsType is kind of expensive; should we really use it?.

StaticCallee returns the target (function or method) of a static function call, if any.

A MethodSetCache records the method set of each type T for which MethodSet(T) is called so that repeat queries are fast.