top is label suffix. Can I pass
label suffix by function call? Given
vardef (suffix qqaa)foo (expr ...) label.qqaa("whatever", origin); enddef;
I don't know where
(suffix qqaa) should put in function. And I don't know how to call
foo to pass the label suffix.
We can define a variable in vardef, e.g.,
vardef foo (expr ..., position). Then judge
if else and give right suffix to label. But it will be much more convenient if we can directly pass label suffix.
The purpose is to give flexibility to user to define label position outside core function.