Unable to call Scala 3 inline methods from within Java

[mdedetrich]

Compiler version

3.3.1

Minimized code

See https://github.com/mdedetrich/call-scala3-inline-from-java-source for a reproducible example

object Inline {
  inline def myMethod: String = ""
}

public class CallInline {
    public void callInline() {
        Inline$.MODULE$.myMethod();
        return;
    }
}

Output

[error] /Users/mdedetrich/github/call-scala3-inline-from-java-source/src/main/java/CallInline.java:4:1: cannot find symbol
[error]   symbol:   method myMethod()
[error]   location: variable MODULE$ of type Inline$
[error] Inline$.MODULE$.myMethod
[error] (Compile / compileIncremental) javac returned non-zero exit code
[error] Total time: 0 s, completed 30 Dec 2023, 15:29:54

Expectation

For the Java source to compile. It appears that unlike Scala 2 with the @inline annotation, Scala 3 will strip the necessary symbols in the produced bytecode when using inline keyword which means its not callable from within Java sources.

For obvious reasons its not expected that Java is actually able to inline the method but rather that it can call it as a standard method without any inlining.

[sjrd]

This is by design. inline requires inlining. Since Java cannot inline the method, it's not allowed to call it at all.

[He-Pin]

@sjrd can we do inlining on the scala calls idempotent but still generate method for java usage ？