docs: def del_expr(self, ctx):
          """
          Returns the MUF needed to delete a given lvalue. (ie: array item)
          Returned MUF will set a bare variable to 0, and will remove the
          given indexed item for an indexed array or dictionary.
          """
          if self.readonly:
              raise MuvError(
                  "Cannot assign value to constant '%s'." % self.varname,
                  position=self.position
              )
          varname = ctx.lookup_variable(self.varname)
          if varname is None:
              raise MuvError(
                  "Undeclared identifier '%s'." % self.varname,
                  position=self.position
              )
          if len(self.indexing) == 0:
              return "0 {var} !".format(var=varname)
          if len(self.indexing) == 1:
              if ctx.target in ['fb7']:
                  return "{var} @ {idx} array_delitem".format(
                      var=varname,
                      idx=self.indexing[0].generate_code(ctx),
                  )
              else:
                  return "{var} @ {idx} array_delitem dup {var} !".format(
                      var=varname,
                      idx=self.indexing[0].generate_code(ctx),
                  )
          if ctx.target in ['fb7']:
              return "{var} @ {{ {idx} }}list array_nested_del".format(
                  var=varname,
                  idx=" ".join(x.generate_code(ctx) for x in self.indexing),
              )
          else:
              return "{var} @ {{ {idx} }}list array_nested_del dup {var} !".format(
                  var=varname,
                  idx=" ".join(x.generate_code(ctx) for x in self.indexing),
              )