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* args *

)Constructs a tuple of the default implementation according to the supplied

argument subforms. Each argument subform can be a list of the form (

expression must evaluate to a tuple, denoting all its mappings. The result is

constructed from the denoted mappings in left-to-right order; so if a given key

is supplied by more than one argument subform, its associated value will be

given by the rightmost such subform.

argument subforms. Each argument subform can be a list of the form (

*key-expr*

*value-expr*

), denoting a mapping from the value of *key-expr*

to the value of*value-expr*

; or a list of the form ($ *expression*

), in which case theexpression must evaluate to a tuple, denoting all its mappings. The result is

constructed from the denoted mappings in left-to-right order; so if a given key

is supplied by more than one argument subform, its associated value will be

given by the rightmost such subform.