Dead end with macros

src/external/numbers/mod.rs

@@ -0,0 +1,38 @@
+mod numeric;
+use numeric::Numeric;
+
+use std::fmt::Debug;
+use std::rc::Rc;
+use std::hash::Hash;
+
+use crate::{atomic_impl, atomic_redirect, externfn_impl, xfn_initial, xfn_middle, xfn_last, xfn};
+use crate::foreign::{ExternError, ExternFn, Atom, Atomic};
+use crate::representations::Primitive;
+use crate::representations::interpreted::{Clause, InternalError};
+
+// xfn_initial!(
+//   /// Multiply function
+//   Multiply2, Multiply1
+// );
+// xfn_middle!(
+//   /// Partially applied multiply function
+//   Multiply2, Multiply1, Multiply0, (
+//     a: Numeric: |c: &Clause| c.clone().try_into()
+//   )
+// );
+// xfn_last!(
+//   /// Fully applied Multiply function.
+//   Multiply1, Multiply0, (
+//     b: Numeric: |c: &Clause| c.clone().try_into(),
+//     a: Numeric: |c: &Clause| c.clone().try_into()
+//   ), Ok((*a * b).into())
+// );
+
+xfn!((
+  /// Multiply function
+  a: Numeric: |c: &Clause| c.clone().try_into(),
+  /// Partially applied multiply function
+  b: Numeric: |c: &Clause| c.clone().try_into()
+), {
+  Ok((*a * b).into())
+});