Scala 2 regression: free-form names in backticks crash at runtime #12729
Description
Compiler version
With 3.0.0 (or 3.0.1-RC1 on scastie)
Minimized code
object foo {
val `<x>` = "hello!"
def main(args: Array[String]): Unit = println(`<x>`)
}Output
In scastie this gives:
java.lang.ClassFormatError: Method "<x>" in class foo has illegal signature "()Ljava/lang/String;"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:757)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at sbt.internal.ManagedClassLoader.findClass(ManagedClassLoader.java:102)
at sbt.internal.BottomClassLoader.lambda$findClass$0(BottomClassLoader.java:56)
at sbt.internal.ClassLoadingLock.withLock(ClassLoadingLock.java:29)
at sbt.internal.BottomClassLoader.findClass(BottomClassLoader.java:51)
at sbt.internal.BottomClassLoader.loadClass(BottomClassLoader.java:66)
at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at sbt.Run.getMainMethod(Run.scala:150)
at sbt.Run.execute$1(Run.scala:81)
at sbt.Run.$anonfun$runWithLoader$5(Run.scala:110)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
at sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:17)
at sbt.TrapExit$App.run(TrapExit.scala:258)
at java.lang.Thread.run(Thread.java:748)
I've also seen it give something like:
java.lang.ClassFormatError: Illegal method name "<expr>"
Expectation
Since (fun) names like this worked fine in 2.13, I'd expect them to work fine in 3 too... perhaps they used to be name mangled?
This form in particular using <name> is useful for giving names to grammar rules in parsers.