Add explicit return type to impure compiler in freemonad docs

typelevel · Feb 13, 2016 · ee36b14 · ee36b14
1 parent b33be92
commit ee36b14
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/src/main/tut/freemonad.md b/docs/src/main/tut/freemonad.md
@@ -173,7 +173,7 @@ import scala.collection.mutable
 
 // the program will crash if a key is not found,
 // or if a type is incorrectly specified.
-def impureCompiler =
+def impureCompiler: KVStoreA ~> Id  =
   new (KVStoreA ~> Id) {
 
     // a very simple (and imprecise) key-value store