Jason Garrett created GROOVY-11008:
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Summary: incorrect type inference after (instanceof || instanceof)
Key: GROOVY-11008
URL: https://issues.apache.org/jira/browse/GROOVY-11008
Project: Groovy
Issue Type: Bug
Components: Compiler
Affects Versions: 3.0.17
Reporter: Jason Garrett
Under static compilation, inside an "if" condition that checks if either of two
variables are an instance of a class, both variables are inferred to be that
class. If one of them is not, accessing it results in a ClassCastException.
{code:java}
import groovy.transform.CompileStatic
@CompileStatic
class InstanceofTypeInference {
static abstract class BaseClass {
abstract String getMyString()
}
static class ClassA extends BaseClass {
String getMyString() {
return "Class A String"
}
}
static class ClassB extends BaseClass {
String getMyString() {
return "Class B String"
}
}
void doStuff(BaseClass foo, BaseClass bar) {
if((foo instanceof ClassA) || (bar instanceof ClassA)) {
println foo.myString
println bar.myString // cannot cast ClassB to ClassA
}
}
static void main(args) {
def example = new InstanceofTypeInference()
example.doStuff(new ClassA(), new ClassB())
}
} {code}
Running this example fails with a ClassCastException.
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