Comment 1 Sebastian Zarnekow 2011-09-29 13:38:11 EDT

I get this stacktrace[3]. The side-effects validation has to unpack casts.
If the casted closure is used in an assignment, the following illegal java code is produced (note the newIterable<T>) [1].
The following snippet will result in invalid code, too [2]:

var Iterable<String> x = [ Object a |
     newArrayList(a.toString).iterator
].curry('')

[1]
  final Function1<Object,String> _function = new Function1<Object,String>() {
      public String apply(final Object a) {
        String _string = a.toString();
        return _string;
      }
    };
  Iterable<String> x = ((Iterable<String>) new Iterable<T>() {
      public Iterator<T> iterator() {
        return _function.apply();
      }
  });

[2] Note the wrong type arguments and the missing final for the _curry:
final Function1<Object,Iterator<String>> _function = new Function1<Object,Iterator<String>>() {
          public Iterator<String> apply(final Object a) {
            String _string = a.toString();
            ArrayList<String> _newArrayList = CollectionLiterals.<String>newArrayList(_string);
            Iterator<String> _iterator = _newArrayList.iterator();
            return _iterator;
          }
        };
      Function0<Iterator<String>> _curry = FunctionExtensions.<String, Iterator<String>>curry(_function, "");
      Iterable<String> x = new Iterable<String>() {
          public Iterator<String> iterator() {
            return _curry.apply();
          }
      };

[3]
java.lang.IllegalArgumentException: a closure definition does not cause any side-effects
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:471)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:137)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:307)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:137)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:63)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:137)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.compile(AbstractXbaseCompiler.java:90)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler.compile(Xtend2Compiler.java:356)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler.compile(Xtend2Compiler.java:166)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Compiler.compile(Xtend2Compiler.java:118)
	at org.eclipse.xtext.xtend2.compiler.Xtend2Generator.doGenerate(Xtend2Generator.java:46)
	at org.eclipse.xtext.builder.BuilderParticipant.handleChangedContents(BuilderParticipant.java:203)
	at org.eclipse.xtext.builder.BuilderParticipant.build(BuilderParticipant.java:154)
	at org.eclipse.xtext.builder.impl.RegistryBuilderParticipant.build(RegistryBuilderParticipant.java:60)
	at org.eclipse.xtext.builder.impl.XtextBuilder.doBuild(XtextBuilder.java:180)
	at org.eclipse.xtext.builder.impl.XtextBuilder.incrementalBuild(XtextBuilder.java:161)
	at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:102)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

Comment 2 Sebastian Zarnekow 2011-09-30 05:49:46 EDT

(In reply to comment #1)
> I get this stacktrace[3]. The side-effects validation has to unpack casts.

Pushed to master.

Comment 3 Sebastian Zarnekow 2012-05-22 11:31:53 EDT

I don't exceptions any more but the code snippet

def something234() {
  [Object a | a.toString] as Iterable<String>
}

compiles to invalid Java code without any error marker in Xtend.

Comment 4 Sven Efftinge 2013-09-12 08:20:31 EDT

fixed in the meantime

Comment 5 Eclipse Webmaster 2017-10-31 11:05:11 EDT

Requested via bug 522520.

-M.

Comment 6 Eclipse Webmaster 2017-10-31 11:16:32 EDT

Requested via bug 522520.

-M.