Merge pull request scala/scala#10593 from som-snytt/issue/9176-null-conversion

BigInt conversion checks for null

Author: lrytz

library/src/scala/collection/IterableOnce.scala

@@ -254,7 +254,7 @@ final class IterableOnceExtensionMethods[A](private val it: IterableOnce[A]) ext
 }
 
 object IterableOnce {
-  @`inline` implicit def iterableOnceExtensionMethods[A](it: IterableOnce[A]): IterableOnceExtensionMethods[A] =
+  @inline implicit def iterableOnceExtensionMethods[A](it: IterableOnce[A]): IterableOnceExtensionMethods[A] =
     new IterableOnceExtensionMethods[A](it)
 
   /** Computes the number of elements to copy to an array from a source IterableOnce

library/src/scala/math/BigInt.scala

@@ -123,7 +123,7 @@ object BigInt {
 
   /** Implicit conversion from `java.math.BigInteger` to `scala.BigInt`.
    */
-  implicit def javaBigInteger2bigInt(x: BigInteger): BigInt = apply(x)
+  implicit def javaBigInteger2bigInt(x: BigInteger): BigInt = if (x eq null) null else apply(x)
 
   // this method is adapted from Google Guava's version at
   //   https://github.com/google/guava/blob/master/guava/src/com/google/common/math/LongMath.java

library/src/scala/util/ChainingOps.scala

@@ -16,7 +16,7 @@ package util
 import scala.language.implicitConversions
 
 trait ChainingSyntax {
-  @`inline` implicit final def scalaUtilChainingOps[A](a: A): ChainingOps[A] = new ChainingOps(a)
+  @inline implicit final def scalaUtilChainingOps[A](a: A): ChainingOps[A] = new ChainingOps(a)
 }
 
 /** Adds chaining methods `tap` and `pipe` to every type.