Java classes with annotations fail to parse #20063
Description
Compiler version
3.3.1
3.5.0-RC1-bin-SNAPSHOT
Should happen in every version, and in Scala 2 as well
Minimized code
// JFun.java
// Other annotations also fail, for example, @Deprecated
@FunctionalInterface
public interface JFun {
String f(String s);
}with an empty scala file in order to trigger the compiling: Stest.scala.
Output
> scala-cli compile JFun.java Stest.scala
Compiling project (Scala 3.3.1, JVM (17))
[error] ./JFun.java:2:1
[error] package expected but public found.
[error] public interface JFun {
[error] ^^^^^^
[error] ./JFun.java:6:1
[error] identifier expected but eof found.
Error compiling project (Scala 3.3.1, JVM (17))
Compilation failed
> scala-cli compile --scala 2 JFun.java Stest.scala
Compiling project (Scala 2.13.13, JVM (17))
[error] ./JFun.java:2:1
[error] `package` expected but `public` found.
[error] public interface JFun {
[error] ^
[error] ./JFun.java:5:1
[error] identifier expected but eof found.
[error] ^
Error compiling project (Scala 2.13.13, JVM (17))
Compilation failed
Expectation
Should compile.
Analyze
In JavaParser, it tries to read annotations with the package.
/** CompilationUnit ::= [package QualId semi] TopStatSeq
*/
def compilationUnit(): Tree = {
val start = in.offset
val pkg: RefTree =
if (in.token == AT || in.token == PACKAGE) {
annotations()
accept(PACKAGE)
val pkg = qualId()
accept(SEMI)
pkg
}
...Scala 2 also has the same issue, since this part is a direct port (and there is a TODO there).
Removing in.token == AT || from the condition and annotations() from the body makes the code compile.