Add _>>_ for IO.Primitive.Core (#2374)

This has to be in scope for desugaring `do` blocks that don't bind
intermediate results.

Author: ncfavier

CHANGELOG.md

@@ -492,6 +492,11 @@ Additions to existing modules
   forever : IO ⊤ → IO ⊤
   ```
 
+* In `IO.Primitive.Core`:
+  ```agda
+  _>>_ : IO A → IO B → IO B
+  ```
+
 * In `Data.Word.Base`:
   ```agda
   _≤_ : Rel Word64 zero

src/IO/Primitive/Core.agda

@@ -36,3 +36,6 @@ postulate
 -- Haskell-style alternative syntax
 return : A → IO A
 return = pure
+
+_>>_ : IO A → IO B → IO B
+a >> b = a >>= λ _ → b