Rewrite CanBuildFrom => Factory without replaceTree

There is a conflict with the replaceSymbol Patch

Author: MasseGuillaume

scalafix/input/src/main/scala/fix/CanBuildFromSrc.scala

@@ -5,8 +5,8 @@ package fix
 
 import scala.language.higherKinds
 
+import scala.collection.immutable
 import collection.generic.CanBuildFrom
-import collection.immutable
 
 object CanBuildFromSrc {
 

scalafix/output/src/main/scala/fix/CanBuildFromSrc.scala

@@ -5,7 +5,8 @@ package fix
 
 import scala.language.higherKinds
 
-import collection.immutable
+import scala.collection.immutable
+import scala.collection.immutable
 import scala.collection.compat._
 
 object CanBuildFromSrc {

scalafix/rules/src/main/scala/scala/fix/collection/CanBuildFrom.scala

@@ -99,15 +99,15 @@ object CanBuildFromNothing {
               tpe @ Type.Apply(
                 collectionCanBuildFrom(_),
                 List(
-                  nothing(_),
+                  not @ nothing(_),
                   t,
                   toT
                 )
               )
             ),
             _
             ) =>
-          new CanBuildFromNothing(param, tpe, t, toT, stats, ctx, toTpe, handledTo)
+          new CanBuildFromNothing(param, tpe, not, t, toT, stats, ctx, toTpe, handledTo)
       }
       .map(_.toFactory)
       .asPatch
@@ -124,6 +124,7 @@ object CanBuildFromNothing {
 // toT  : CC[Int]
 case class CanBuildFromNothing(param: Name,
                                tpe: Type.Apply,
+                               not: Type,
                                t: Type,
                                toT: Type,
                                stats: List[Tree],
@@ -197,11 +198,15 @@ case class CanBuildFromNothing(param: Name,
 
     // implicit cbf: collection.generic.CanBuildFrom[Nothing, Int, CC[Int]] =>
     // implicit cbf: Factory[Int, CC[Int]]
-    val parameterType =
-      ctx.replaceTree(
-        tpe,
-        Type.Apply(Type.Name("Factory"), List(t, toT)).syntax
-      )
+    val parameterType = {
+      val comma    = ctx.tokenList.trailing(not.tokens.last).find(_.is[Token.Comma]).get
+      val spaceOpt = ctx.tokenList.trailing(comma).find(_.is[Token.Space])
+
+      ctx.removeTokens(not.tokens) +
+        ctx.removeToken(comma) +
+        spaceOpt.map(ctx.removeToken).getOrElse(Patch.empty) +
+        ctx.replaceTree(tpe.tpe, "Factory")
+    }
 
     parameterType + cbfCalls + toCalls
   }

scalafix/tests/src/test/scala/fix/ScalafixTests.scala

@@ -7,7 +7,7 @@ import scalafix.testkit._
 class ScalafixTests extends scalafix.testkit.SemanticRuleSuite {
 
   val only: Option[String] =
-    // Some("TraversableSrc") // << to run only one test:
+    // Some("Playground") // << to run only one test:
     None
 
   def testOnly(file: String): Unit = {