A single stack frame.
The name of the stack frame. For mixin frames, this is the mixin name; otherwise, it's `nil`.
@return [String?]
The type of this stack frame. This can be `:import`, `:mixin`, or `:base`.
`:base` indicates that this is the bottom-most frame, meaning that it represents a single line of code rather than a nested context. The stack will only ever have one base frame, and it will always be the most deeply-nested frame.
@return [Symbol?]
Whether this is the base frame.
@return [Boolean]
# File lib/sass/stack.rb, line 59 def is_base? type == :base end
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