@return [Array<Object>] the list of requirements that led to
`requirement` being required.
Nonsymmetric reduction from Hessenberg to real Schur form.
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 options for the gem install command.
@return [Array<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.