fix headers

Author: SteveBronder

stan/math/fwd/fun/pow.hpp

@@ -6,6 +6,7 @@
 #include <stan/math/fwd/fun/inv.hpp>
 #include <stan/math/fwd/fun/inv_sqrt.hpp>
 #include <stan/math/fwd/fun/inv_square.hpp>
+#include <stan/math/fwd/fun/log.hpp>
 #include <stan/math/fwd/fun/sqrt.hpp>
 #include <stan/math/fwd/fun/square.hpp>
 #include <stan/math/prim/fun/pow.hpp>
@@ -63,22 +64,6 @@ inline auto pow(const T1& x1, const T2& x2) {
 }
 
 
-// must uniquely match all pairs of:
-//    { complex<fvar<V>>, complex<T>, fvar<V>, T }
-// with at least one fvar<V> and at least one complex, where T is arithmetic:
-// 1) complex<fvar<V>>, complex<fvar<V>>
-// 2) complex<fvar<V>>, complex<T>
-// 3) complex<fvar<V>>, fvar<V>
-// 4) complex<fvar<V>>, T
-// 5) complex<T>, complex<fvar<V>>
-// 6) complex<T>, fvar<V>
-// 7) fvar<V>, complex<fvar<V>>
-// 8) fvar<V>, complex<T>
-// 9) T, complex<fvar<V>>
-
-
-
-
 /**
  * Returns the elementwise raising of the first argument to the power of the
  * second argument.

stan/math/prim/meta/base_type.hpp

@@ -4,6 +4,7 @@
 #include <stan/math/prim/fun/Eigen.hpp>
 #include <stan/math/prim/meta/is_complex.hpp>
 #include <stan/math/prim/meta/is_eigen.hpp>
+#include <stan/math/prim/meta/value_type.hpp>
 #include <stan/math/prim/meta/is_vector.hpp>
 #include <type_traits>
 #include <vector>

stan/math/prim/meta/is_var.hpp

@@ -1,7 +1,7 @@
 #ifndef STAN_MATH_PRIM_META_IS_VAR_HPP
 #define STAN_MATH_PRIM_META_IS_VAR_HPP
 
-#include <stan/math/prim/meta.hpp>
+#include <stan/math/prim/meta/require_helpers.hpp>
 
 #include <type_traits>