20 static bool implies(const LExpr *LHS, bool LNeg, const LExpr *RHS, bool RNeg) {  in implies()  function
25     return implies(A->left(), LNeg, RHS, RNeg) &&  in implies()
26            implies(A->right(), LNeg, RHS, RNeg);  in implies()
29     return implies(LHS, LNeg, A->left(), RNeg) &&  in implies()
30            implies(LHS, LNeg, A->right(), RNeg);  in implies()
35     return implies(A->left(), LNeg, RHS, RNeg) ||  in implies()
36            implies(A->right(), LNeg, RHS, RNeg);  in implies()
39     return implies(LHS, LNeg, A->left(), RNeg) ||  in implies()
40            implies(LHS, LNeg, A->right(), RNeg);  in implies()
62     return implies(LHS, LNeg, cast<Not>(RHS)->exp(), !RNeg);  in implies()
87     return implies(cast<Not>(LHS)->exp(), !LNeg, RHS, RNeg);  in implies()
106 bool implies(const LExpr *LHS, const LExpr *RHS) {  in implies()  function
108   return ::implies(LHS, false, RHS, false);  in implies()