boolean (PsiBuilder b, int l, Parser _a, Parser _b) { if (!recursion_guard_(b, l, "a_b_a")) return false; boolean r, p; Marker m = enter_section_(b, l, _NONE_); r = _a.parse(b, l); p = r; // pin = 1 r = r && a_b_a_1(b, l + 1, _b, _a); exit_section_(b, l, m, r, p, null); return r || p; }