Does this dependency request match spec?
NOTE: matches_spec? matches prerelease versions. See also match?
Enumerates trusted certificates.
Delegates to the wrapped source’s fetch_spec method.
Check that a method is callable via dRuby.
obj is the object we want to invoke the method on. msg_id is the method name, as a Symbol.
If the method is an insecure method (see insecure_method?) a SecurityError is thrown. If the method is private or undefined, a NameError is thrown.
Visit the child nodes of the given node.