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invalid generic signature for type params bounded by primitive #9846

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scabug opened this issue Jul 6, 2016 · 1 comment
Open

invalid generic signature for type params bounded by primitive #9846

scabug opened this issue Jul 6, 2016 · 1 comment
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backend bytecode erasure fixed in Scala 3 This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/)
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@scabug
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scabug commented Jul 6, 2016

scala code:

class A {
  def f[T <: Int](x: T): T = x
}

the generic signature looks like this:

  // access flags 0x1
  // signature <T:Ljava/lang/Object;>(TT;)TT;
  // declaration: T f<T>(T)
  public f(I)I

which is invalid, java generics don't abstract over primitives. the following java code compiles:

public class B {
  public static void main(String[] args) {
    A a = new A();
    System.out.println(a.f(10));
  }
}

but fails to run

Exception in thread "main" java.lang.NoSuchMethodError: A.f(Ljava/lang/Object;)Ljava/lang/Object;
        at B.main(B.java:4)
@scabug
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scabug commented Jul 6, 2016

Imported From: https://issues.scala-lang.org/browse/SI-9846?orig=1
Reporter: @lrytz
Affected Versions: 2.12.0-M5

@scabug scabug added the quickfix label Apr 7, 2017
@scabug scabug added this to the Backlog milestone Apr 7, 2017
@smarter smarter mentioned this issue Jun 8, 2022
Closed
@SethTisue SethTisue added the fixed in Scala 3 This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/) label Apr 4, 2023
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backend bytecode erasure fixed in Scala 3 This issue does not exist in the Scala 3 compiler (https://github.com/lampepfl/dotty/)
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