More progress.

src/block.rs

@@ -71,7 +71,7 @@ macro_rules! block_impl {
             fn block<B>(value: Self) -> Self where B: Block { value / B::bits() as Self }
 
             #[inline]
-            fn bit<B>(value: B) -> Self where B: Block { B::biter::<Self>(value) as Self }
+            fn bit<B>(value: B) -> Self where B: Block { Self::from(B::biter::<Self>(value)) }
 
             #[inline]
             fn biter<B>(value: Self) -> u8 where B: Block { (value % B::bits() as Self) as u8 }

src/lib.rs

@@ -247,6 +247,14 @@ impl<'a, T, B> ops::BitOr<&'a Self> for BitSet<T, B> where T: Block, B: Block {
         self
     }
 }
+
+pub struct Iter<'a, T: 'a, B: 'a> {
+    iter: std::collections::hash_map::Iter<'a, T, B>,
+    block: T,
+    bits: B,
+    bit: B,
+}
+
 /*
 pub struct Iter<'a> {
     iter: std::collections::hash_map::Iter<'a, u64, u64>,