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/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-fre-details" } */

int f();

template<typename predicate>
class noop_t {
    const predicate &pred;
public:
    explicit noop_t(const predicate &p) : pred(p) {}

    int operator()() const { return pred(); }
};

template<typename predicate>
inline noop_t<predicate> noop(const predicate pred) {
    return noop_t<predicate>(pred);
}

int x()
{
  return (noop(noop(noop(noop(noop(noop(noop(noop(noop(f)))))))))());
}

/* We should optimize this to a direct call.  */

/* { dg-final { scan-tree-dump "Replacing call target with f" "fre" } } */
/* { dg-final { cleanup-tree-dump "fre" } } */