Exception throw when compiling a project: java.lang.NullPointerException: tried to cast away nullability, but value is null #15845
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OndrejSpanel
added
the
stat:needs triage
KacperFKorban
added
the
stat:needs minimization
szymon-rd
added
area:typer
and removed
stat:needs triage
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Yes, that's clearly a compiler bug. |
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@OndrejSpanel if you run this on latest main once #15890 is merged you should hopefully get the compilation unit that caused the crash. |
To clarify how to proceed: does this mean I should test the issue on 3.1.4 once it is released? |
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If you want to wait for a release it would be 3.2.1. But you could also run
with the nightly before. once #15845 is merged.
…On Sat, Aug 20, 2022 at 1:16 PM Ondřej Španěl ***@***.***> wrote:
if you run this on latest main
To clarify how to proceed: does this mean I should test the issue on 3.1.4
once it is released?
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@OndrejSpanel can you try with scalaVersion |
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Thanks for pinging me. When I have tried that, I am told which file is the error in, and that the error is while typechecking:
When I remove State.scala completely, I get a different error in a different file:
I will try removing a much as possible to still get the |
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I was able to reduce the repro into two files, each of them containing only a few lines of code. Repro is available in https://github.com/OndrejSpanel/scala3-error-repro I was not able to reproduce the issue in a single file, or without a nested This is how the files currently look like: Config.scala: package config
package state
case class Config(simulations: Seq[(String, Any)] = Seq.empty)State.scala: package config
import state._
object State {
object Info {
def apply(): Info = Info(Config(), Seq.empty)
}
case class Info(cfg: AnyRef, allTypes: Seq[AnyRef])
} |
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Thanks for minimization! I tried to reproduce it, but it works for me. Is there something unexpected on your classpath maybe? |
How can I check for that? I get the error by just launching I use Windows 11 x64, my default Java version is 11:
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It it not Windows specific, it can be reproduced on a GitHub runner using Ubuntu, see https://github.com/OndrejSpanel/scala3-error-repro/runs/7954324298?check_suite_focus=true I think the GitHub runner environment should be clean and there should be no class-path issues on it. |
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I could reproduce it now. The two files have to be compiled as State.scala and Config.scala, in that order on the command line. If the order is swapped, it compiles. I.e. |
Fixes scala#15845. Curiously this code was never exercised before, despite the many millions of lines of code we compile. It's even more curious that the faulty behavior could be triggered by such a simple example.
Compiler version
3.1.3
Minimized example
I am afraid I do not have a minimized example yet, I will need some advice on how to extract it.
I am trying to port my complex project to Scala 3. I have fixed most deprecation warnings in 2.13 and upgraded almost all libraries. I am not getting much compiler errors any more, but still use both "-source:3.0-migration" and "-Xignore-scala2-macros", as not all libraries are ported and I still need to compile the project as 2.13 one.
Output
When building my project with Scala 3.1.3, I get following error:
I am not told which part of the project / what particulat Scala source is the compiler working at, therefore I have no idea how could I pinpoint the problem.
The top of the callstack is:
Expectation
I think compiler can show errors, but should never throw exceptions.
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