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[Frama-c-discuss] What is wrong with this inductive sum definition?

  • Subject: [Frama-c-discuss] What is wrong with this inductive sum definition?
  • From: dclist at gmail.com (dclist)
  • Date: Sun, 27 Feb 2011 09:10:59 -0500
/*@ inductive is_sum{L}(integer i, int* t, int s) {
      case is_sum_base{L}:
         \forall integer i, int* t, int s; i <= 0 ==> \at(*t,L) == s;
      case is_sum_left{L}:
         \forall integer i, int* t, int s; i > 0 && is_sum(i, t, s)
              ==> is_sum(i-1,t,s-\at(*(t + i),L));
    }
   */

gives me the error

foo.h:6:[kernel] user error: Error during annotations analysis:
invalid implicit conversion from ? to int

What am I doing wrong?