Noop pos counter

default-streams/src/pos/mod.rs

@@ -1,5 +1,6 @@
 mod index;
 mod newline;
+mod nop;
 
 pub use index::IndexPosCounter;
 pub use newline::PosLineCol;

default-streams/src/pos/nop.rs

@@ -0,0 +1,12 @@
+use crate::iterator::PosCounter;
+pub struct NopPosCounter {}
+
+impl<C> PosCounter<'static, C, ()> for NopPosCounter {
+    fn update(&mut self, c: C) {}
+
+    fn export(&self) {}
+
+    fn init() -> Self {
+        return NopPosCounter {};
+    }
+}

src/lib.rs

@@ -6,6 +6,7 @@ pub trait Predicate<C> {
 
 pub trait Pos<'pos> {}
 
+impl Pos<'static> for () {}
 impl Pos<'static> for usize {}
 
 pub trait KeywordComparatorIterator<'keyword, C> {