nbits completely removed

data/shared/src/main/scala/sigma/ast/methods.scala

@@ -312,10 +312,6 @@ case object SBigIntMethods extends SNumericTypeMethods {
   final val ToNBitsCostInfo = OperationCostInfo(
     FixedCost(JitCost(5)), NamedDesc("NBitsMethodCall"))
 
-  //id = 8 to make it after toBits
-  val ToNBits = SMethod(this, "nbits", SFunc(this.ownerType, SLong), 8, ToNBitsCostInfo.costKind)
-                  .withInfo(ModQ, "Encode this big integer value as NBits")
-
   /** The following `modQ` methods are not fully implemented in v4.x and this descriptors.
     * This descritors are remain here in the code and are waiting for full implementation
     * is upcoming soft-forks at which point the cost parameters should be calculated and

interpreter/shared/src/test/scala/sigma/serialization/MethodCallSerializerSpecification.scala

@@ -24,25 +24,4 @@ class MethodCallSerializerSpecification extends SerializationSpecification {
     roundTripTest(expr)
   }
 
-  property("MethodCall deserialization round trip for BigInt.nbits") {
-    def code = {
-      val bi = BigIntConstant(5)
-      val expr = MethodCall(bi,
-        SBigIntMethods.ToNBits,
-        Vector(),
-        Map()
-      )
-      roundTripTest(expr)
-    }
-
-    VersionContext.withVersions(VersionContext.V6SoftForkVersion, 1) {
-      code
-    }
-
-    an[ValidationException] should be thrownBy (
-      VersionContext.withVersions((VersionContext.V6SoftForkVersion - 1).toByte, 1) {
-        code
-      }
-      )
-  }
 }