A parent-referencing selector (`&` in Sass). The function of this is to be replaced by the parent selector in the nested hierarchy.
@see Selector#to_a
# File lib/sass/selector.rb, line 26 def to_a ["&"] end
Always raises an exception.
@raise [Sass::SyntaxError] Parent selectors should be resolved before unification @see Selector#unify
# File lib/sass/selector.rb, line 34 def unify(sels) raise Sass::SyntaxError.new("[BUG] Cannot unify parent selectors.") end
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