Avoid instance name collisions

circe · Jun 12, 2019 · 8a27b32 · 8a27b32
1 parent 6b99cb3
commit 8a27b32
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/modules/generic/shared/src/main/scala/io/circe/generic/util/macros/JsonCodecMacros.scala b/modules/generic/shared/src/main/scala/io/circe/generic/util/macros/JsonCodecMacros.scala
@@ -73,15 +73,15 @@ abstract class JsonCodecMacros {
       )
     } else {
       val tparamNames = tparams.map(_.name)
-      def mkImplicitParams(typeSymbol: TypeSymbol) =
+      def mkImplicitParams(prefix: String, typeSymbol: TypeSymbol) =
         tparamNames.zipWithIndex.map {
           case (tparamName, i) =>
-            val paramName = TermName(s"instance$i")
+            val paramName = TermName(s"$prefix$i")
             val paramType = tq"$typeSymbol[$tparamName]"
             q"$paramName: $paramType"
         }
-      val decodeParams = mkImplicitParams(DecoderClass)
-      val encodeParams = mkImplicitParams(EncoderClass)
+      val decodeParams = mkImplicitParams("decode", DecoderClass)
+      val encodeParams = mkImplicitParams("encode", EncoderClass)
       val Type = tq"$tpname[..$tparamNames]"
       (
         q"""implicit def $decodeName[..$tparams](implicit ..$decodeParams): $DecoderClass[$Type] =