@param [Object] requirement @return [Array<Object>] the list of requirements that led to
`requirement` being required.
Search through all unresolved deps and sub-dependencies and return specs that contain the file matching path.
Returns a Ruby lighter-weight code representation of this specification, used for indexing only.
See to_ruby.
Default description for the gem install and update commands.
@return [Set<Vertex>] the vertices of {#graph} where ‘self` is a
{#descendent?}
@param [Set<Vertex>] vertices the set to add the predecessors to @return [Set<Vertex>] the vertices of {#graph} where ‘self` is a
{#descendent?}
@return [Array<Array<Object>>] The different requirement
trees that led to every requirement for the current spec.