Add an implicitNotFoundAnnotation.

typelevel · Apr 4, 2024 · b5f6290 · b5f6290
1 parent 08d12df
commit b5f6290
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/modules/core/shared/src/main/scala/weaver/Comparison.scala b/modules/core/shared/src/main/scala/weaver/Comparison.scala
@@ -3,7 +3,9 @@ package weaver
 import cats.Eq
 import cats.Show
 import com.eed3si9n.expecty._
+import scala.annotation.implicitNotFound
 
+@implicitNotFound("Could not find an implicit Comparison[${A}]. Does ${A} have an associated cats.Eq[${A}] instance?")
 trait Comparison[A] {
   def diff(expected: A, found: A): Option[String]
 }