No idea what is the problem but I reproduce the issue with Nasser erfc function.

The macro erfc2 is taken into account and works.

ric

(1) -> )system cat /home/guida/.fricas.input
)set output characters default
macro %SIF(e) == unparse(e::InputForm) -- SPAD Input Form
erfc(x) == 1 - erf(x)
macro erfc2(x) == 1 - erf(x)
(1) -> erfc2(1)

   (1)  - erf(1) + 1
                                                    Type: Expression(Integer)
(2) -> erfc(1)
   There are no library operations named erfc
      Use HyperDoc Browse or issue
                                )what op erfc
      to learn if there is any operation containing " erfc " in its
      name.
Cannot find a definition or applicable library operation named erfc
      with argument type(s)
                               PositiveInteger
Perhaps you should use "@" to indicate the required return type,
      or "$" to specify which version of the function you need.

(2) -> )display op erfc
   erfc is not a known function. FriCAS will try to list its functions
      which contain erfc in their names. This is the same output you
      would get by issuing
                            )what operations erfc

   There are no operations containing those patterns

(2) ->

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