Warn on inharmonic conversions [ci: last-only] (scala/scala#8679)

Warn on inharmonic conversions [ci: last-only]

Author: lrytz

library/src/scala/Function0.scala

@@ -11,7 +11,7 @@
  */
 
 // GENERATED CODE: DO NOT EDIT.
-// genprod generated these sources at: 2019-06-18T20:49:11.955Z
+// genprod generated these sources at: 2020-02-01T04:13:22.795Z
 
 package scala
 

library/src/scala/Int.scala

@@ -478,8 +478,9 @@ object Int extends AnyValCompanion {
   override def toString = "object scala.Int"
   /** Language mandated coercions from Int to "wider" types. */
   import scala.language.implicitConversions
-  implicit def int2long(x: Int): Long = x.toLong
+  @deprecated("Implicit conversion from Int to Float is dangerous because it loses precision. Write `.toFloat` instead.", "2.13.1")
   implicit def int2float(x: Int): Float = x.toFloat
+  implicit def int2long(x: Int): Long = x.toLong
   implicit def int2double(x: Int): Double = x.toDouble
 }
 

library/src/scala/Long.scala

@@ -475,7 +475,9 @@ object Long extends AnyValCompanion {
   override def toString = "object scala.Long"
   /** Language mandated coercions from Long to "wider" types. */
   import scala.language.implicitConversions
+  @deprecated("Implicit conversion from Long to Float is dangerous because it loses precision. Write `.toFloat` instead.", "2.13.1")
   implicit def long2float(x: Long): Float = x.toFloat
+  @deprecated("Implicit conversion from Long to Double is dangerous because it loses precision. Write `.toDouble` instead.", "2.13.1")
   implicit def long2double(x: Long): Double = x.toDouble
 }