[GROOVY-532] += gives me "Unable to pop operand off"

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0-beta-5
• Fix Version/s: 1.0-beta-10
• Assignee: Jochen Theodorou
• Reporter: Jonathan Aquino
• Created: 10/Jun/04 19:22
• Updated: 07/Feb/05 12:10
• Resolved: 07/Feb/05 12:10

Description

If I use x=x+ instead of x+=, I don't get the exception.

=== test.groovy

x = ""
[1..5].each {
x += "blah"
[1..5].each

{ # x = x + "blah" x += "blah" }

}

=== output

[]
[]
Caught: groovy.lang.GroovyRuntimeException: (class: test$2, method: doCall signature: (Ljava/lang/Object;)Ljava/lang/Object Unable to pop operand off an empty stack
groovy.lang.GroovyRuntimeException: (class: test$2, method: doCall signature: (Ljava/lang/Object;)Ljava/lang/Object Unable to pop operand off an empty stack
at groovy.lang.Closure.throwRuntimeException(Closure.java:248)
at groovy.lang.Closure.call(Closure.java:205)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:283)
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:324)
at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:56)
at org.codehaus.groovy.runtime.NewStaticMetaMethod.invoke(NewStaticMetaMethod.java:100)
at groovy.lang.MetaClass.doMethodInvoke(MetaClass.java:846)
at groovy.lang.MetaClass.invokeMethod(MetaClass.java:268)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:130)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:101)
at test.run(test.groovy:1)
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:324)
at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:56)
at groovy.lang.MetaClass.doMethodInvoke(MetaClass.java:846)
at groovy.lang.MetaClass.invokeMethod(MetaClass.java:268)
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:324)
at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:56)
at groovy.lang.MetaClass.doMethodInvoke(MetaClass.java:846)
at groovy.lang.MetaClass.invokeMethod(MetaClass.java:268)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:130)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:101)
at test.invokeMethod(test.groovy)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:117)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:101)
at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:332)
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:324)
at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:56)
at groovy.lang.MetaClass.doMethodInvoke(MetaClass.java:846)
at groovy.lang.MetaClass.invokeStaticMethod(MetaClass.java:329)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:124)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:101)
at test.main(test.groovy)
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:324)
at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:56)
at groovy.lang.MetaClass.doMethodInvoke(MetaClass.java:846)
at groovy.lang.MetaClass.invokeStaticMethod(MetaClass.java:329)
at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:124)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:101)
at groovy.lang.GroovyShell.run(GroovyShell.java:183)
at groovy.lang.GroovyShell.main(GroovyShell.java:88)
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:324)
at org.codehaus.classworlds.Launcher.launchStandard(Launcher.java:410)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:344)
at org.codehaus.classworlds.Launcher.main(Launcher.java:474)
Caused by: java.lang.VerifyError: (class: test$2, method: doCall signature: (Ljava/lang/Object;)Ljava/lang/Object Unable to pop operand off an empty stack
at test$1.doCall(test.groovy:3)
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:324)
at org.codehaus.groovy.runtime.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:56)
at groovy.lang.Closure.call(Closure.java:195)
... 60 more