fix: generalize from_types macro

src/elements/mn.rs

@@ -18,7 +18,7 @@ impl<'a> From<&'a str> for Num {
     }
 }
 
-crate::from_types!(u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize);
+crate::from_types!(u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize => Num);
 
 impl<T> From<T> for MathMl
 where

src/lib.rs

@@ -4,6 +4,8 @@ pub mod attributes;
 pub mod elements;
 pub mod markers;
 
+use elements::Num;
+
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub(crate) enum Tag {
     Num(Num),
@@ -16,9 +18,9 @@ pub struct MathMl {
 }
 
 macro_rules! from_types {
-    ($($type:ty),* $(,)?) => {
+    ($($type:path),* $(,)? => $for_type:path) => {
         $(
-        impl From<$type> for Num {
+        impl From<$type> for $for_type {
             fn from(value: $type) -> Self {
                 Self {
                     num: format!("{}", value),
@@ -30,5 +32,4 @@ macro_rules! from_types {
     };
 }
 
-use elements::Num;
 pub(crate) use from_types;