Evaluation of String problem

[Roy van Rijn]

Dear kulla-devs,

Trying the latest code from the kulla branch, and I've done the following:
1) Install JDK 9
2) Get latest sources: get_sources.sh
3) Modified script/compile.sh for OS/X (/bin instead of /usr/bin)
4) Modified script/compile.sh removed path
../src/jdk.jshell/share/classes/*/*/*/*/*/*.java (there doesnt seem to
be a java file matching six stars)
5) Compile (no messages, works fine)
6) Modified script/run.sh for OS/X (/bin instead of /usr/bin)
7) Started jshell (although the version is: Version (version info not
available))

Next there seems to be a problem evaluating strings with the +
operator, for example:

-> String a = "a";
|  Added variable a of type String with initial value "a"
-> String b = "b";
|  Added variable b of type String with initial value "b"
-> String c = a + b;
|  Added variable c of type String
-> String d = "test " + " another test";
|  Added variable d of type String
-> System.out.println(a);
a
-> System.out.println(b);
b
-> System.out.println(c);
null
-> System.out.println(d);
null

Any idea what could be causing this? This breaks the most trivial of
examples, for example:
-> double tau = Math.PI * 2;
|  Added variable tau of type double with initial value 6.283185307179586

-> System.out.println("Tau is: " + tau);
An exception has occurred in the compiler (1.9.0-ea). Please file a
bug against the Java compiler via the Java bug reporting page
(http://bugreport.java.com) after checking the Bug Database
(http://bugs.java.com) for duplicates. Include your program and the
following diagnostic in your report. Thank you.
java.lang.AssertionError
at com.sun.tools.javac.util.Assert.error(Assert.java:155)
at com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:62)
at com.sun.tools.javac.util.ListBuffer.append(ListBuffer.java:127)
at com.sun.tools.javac.parser.JavacParser.arguments(JavacParser.java:1799)
at com.sun.tools.javac.parser.JavacParser.arguments(JavacParser.java:1814)
at com.sun.tools.javac.parser.JavacParser.term3(JavacParser.java:1276)
at com.sun.tools.javac.parser.JavacParser.term2(JavacParser.java:902)
at com.sun.tools.javac.parser.JavacParser.term1(JavacParser.java:873)
at com.sun.tools.javac.parser.JavacParser.term(JavacParser.java:829)
at com.sun.tools.javac.parser.JavacParser.term(JavacParser.java:809)
at jdk.jshell.ReplParser.replUnit(ReplParser.java:225)
at jdk.jshell.ReplParser.parseCompilationUnit(ReplParser.java:132)
at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:601)
at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:638)
at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:930)
at com.sun.tools.javac.api.JavacTaskImpl.parseInternal(JavacTaskImpl.java:233)
at com.sun.tools.javac.api.JavacTaskImpl.access$400(JavacTaskImpl.java:69)
at com.sun.tools.javac.api.JavacTaskImpl$2.call(JavacTaskImpl.java:225)
at com.sun.tools.javac.api.JavacTaskImpl$2.call(JavacTaskImpl.java:222)
at com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:128)
at com.sun.tools.javac.api.JavacTaskImpl.parse(JavacTaskImpl.java:222)
at jdk.jshell.TaskFactory$ParseTask.parse(TaskFactory.java:221)
at jdk.jshell.TaskFactory$ParseTask.<init>(TaskFactory.java:207)
at jdk.jshell.CompletenessAnalyzer$Parser.disambiguateDeclarationVsExpression(CompletenessAnalyzer.java:671)
at jdk.jshell.CompletenessAnalyzer$Parser.parseUnit(CompletenessAnalyzer.java:615)
at jdk.jshell.CompletenessAnalyzer.scan(CompletenessAnalyzer.java:87)
at jdk.jshell.SourceCodeAnalysisImpl.analyzeCompletion(SourceCodeAnalysisImpl.java:133)
at jdk.internal.jshell.tool.ConsoleIOContext$1.analyzeCompletion(ConsoleIOContext.java:77)
at jdk.internal.jshell.tool.EditingHistory.add(EditingHistory.java:127)
at jdk.internal.jline.console.ConsoleReader.finishBuffer(ConsoleReader.java:655)
at jdk.internal.jline.console.ConsoleReader.accept(ConsoleReader.java:2027)
at jdk.internal.jline.console.ConsoleReader.readLine(ConsoleReader.java:2695)
at jdk.internal.jline.console.ConsoleReader.readLine(ConsoleReader.java:2277)
at jdk.internal.jshell.tool.ConsoleIOContext.readLine(ConsoleIOContext.java:153)
at jdk.internal.jshell.tool.JShellTool.run(JShellTool.java:447)
at jdk.internal.jshell.tool.JShellTool.start(JShellTool.java:266)
at jdk.internal.jshell.tool.JShellTool.start(JShellTool.java:245)
at jdk.internal.jshell.tool.JShellTool.main(JShellTool.java:235)

Is there something wrong with the way I've compiled/used the latest
code? Or is the jshell actually broken at this point?

Roy