empty_stack()

If no arguments are provided, adds the names of any headers without values to a stack. If one or more arguments are provided and an argument is a variable that variable is checked for emptyness.

Header and variable arguments can be mixed.

The resulting stack does not persist from line to line.

Data signatures
empty_stack()
empty_stack( [header or var: $${\color{green}None}$$ ǁ $${\color{green}Any}$$], ... )

Call signatures
empty_stack()
empty_stack( [header or var: Variable ǁ Header], ... )

Purpose	Value
Main focus	empty_stack() produces a calculated value

Context	Qualifier
Match qualifiers	onmatch
Value qualifiers	onmatch

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