The function merge-ef-specs
returns an external format spec constructed by adding information not supplied in ef-spec1 from ef-spec2.
Each external format spec argument is either a symbol or a list.
If ef-spec1 and ef-spec2 have the same value for their name component (whether they are lists or symbols), return ef-spec1 combined with any parameters from ef-spec2 that are not specified in ef-spec1.
Otherwise, if ef-spec1 is :default
or a list beginning with :default
, return ef-spec2 with parameters modified to be a union of the parameters from ef-spec1 and ef-spec2, with those from ef-spec1 taking priority.
Otherwise, return ef-spec1 with any :eol-style
parameter from ef-spec2 if ef-spec1 does not specify :eol-style
.
LispWorks User Guide and Reference Manual - 20 Sep 2017