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Editorial Team
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Asked: 2026-05-31T23:43:51+00:00

What’s behind the NumericRange Int size restriction on the Scala for-loop comprehension? Is it

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What’s behind the NumericRange Int size restriction on the Scala for-loop comprehension? Is it possible (without to much headache) to extend “for/Seqs” NumericRange to make use of Long (or anything bigger than Int.MaxValue)?

scala>for (i: Long <- 0L to 10000000000) {}

java.lang.IllegalArgumentException: 0 to 10000000000L by 1: "seqs cannot contain more than Int.MaxValue elements."
    at scala.collection.immutable.NumericRange$.count(NumericRange.scala:227)
    at scala.collection.immutable.NumericRange.numRangeElements(NumericRange.scala:53)
    at scala.collection.immutable.NumericRange.length(NumericRange.scala:55)
    at scala.collection.immutable.NumericRange.foreach(NumericRange.scala:73)
    at .<init>(<console>:19)
    at .<clinit>(<console>)
    at .<init>(<console>:11)
    at .<clinit>(<console>)
    at $print(<console>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
    at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920)
    at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
    at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
    at java.lang.Thread.run(Thread.java:680)

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Thanks in advance!

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1 Answer

  1. Editorial Team

    Short answer- it appears to be a “feature” – at least, it’s working as designed.

    As @drexin pointed out, the implementation of “to” is limited to having an Int range. However…

    The problem is that NumericRange[T].count(), .numRangeElements, and .length() returns an Int – regardless of what T is. In this case, it’s a NumericRange[Long], where it seems a bit wrong to have count() limited to 31 bits, IMHO.
    However…

    From browsing Jira issues, this appears to be working as designed. See, e.g., SI-4370. But just to be sure it’s been thought out from this perspective, I entered SI-5619.

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