get_index_of instead of get_full and docs on LinkTable explaini…

…ng `K`.

hugr-model/src/v0/scope/link.rs

@@ -10,9 +10,14 @@ type FxIndexSet<K> = IndexSet<K, BuildHasherDefault<FxHasher>>;
 /// Table for tracking links between ports.
 ///
 /// Two ports are connected when they share the same link. Links are named and
-/// scoped via isolated regions. The names of links must be unique within a
-/// single isolated region. Links from one isolated region are not visible in
-/// another. Links do not have a unique point of declaration.
+/// scoped via isolated regions. Links from one isolated region are not visible
+/// in another. Links do not have a unique point of declaration.
+///
+/// The link table keeps track of an association between a key of type `K` and
+/// the link indices within each region. When resolving links from a text format,
+/// `K` is the name of the link as a string slice. However the link table might
+/// is also useful in other contexts where the key is not a string when constructing
+/// a module from a different representation.
 ///
 /// # Examples
 ///

hugr-model/src/v0/scope/vars.rs

@@ -81,9 +81,9 @@ impl<'a> VarTable<'a> {
     /// Panics if there are no open scopes.
     pub fn resolve(&self, name: &'a str) -> Result<VarId, UnknownVarError<'a>> {
         let scope = self.scopes.last().unwrap();
-        let (set_index, _) = self
+        let set_index = self
             .vars
-            .get_full(&(scope.node, name))
+            .get_index_of(&(scope.node, name))
             .ok_or(UnknownVarError(scope.node, name))?;
         let var_index = (set_index - scope.var_stack) as u16;
         Ok(VarId(scope.node, var_index))