castError.cfa:7:1 error: Cannot choose between 3 alternatives for expression
Cast of:
  Name: f
... to:
  char Alternatives are:
Cost ( 1, 0, 0, 0, 0, 0, 0 ): Cast of:
     Variable Expression: f: function
       accepting unspecified arguments
     ... returning nothing

   ... to:
     char
 (types:
   char
 )
 Environment:

Cost ( 1, 0, 0, 0, 0, 0, 0 ): Cast of:
     Variable Expression: f: double
   ... to:
     char
 (types:
   char
 )
 Environment:

Cost ( 1, 0, 0, 0, 0, 0, 0 ): Cast of:
     Variable Expression: f: signed int
   ... to:
     char
 (types:
   char
 )
 Environment: