An error caused by searching for a dependency that is completely unknown, i.e. has no versions available whatsoever.
An error caused by attempting to fulfil a dependency that was circular
@note This exception will be thrown iff a {Vertex} is added to a
{DependencyGraph} that has a {DependencyGraph::Vertex#path_to?} an
existing {DependencyGraph::Vertex}
This class encapsulates a dependency resolver. The resolver is responsible for determining which set of dependencies to activate, with feedback from the {#specification_provider}
A state that encapsulates a set of {#requirements} with an {Array} of possibilities
A state that encapsulates a single possibility to fulfill the given {#requirement}
Delegates all {Gem::Resolver::Molinillo::ResolutionState} methods to a ‘#state` property.