Stefanos Chaliasos created GROOVY-9967:
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Summary: STC: Access to field/property is forbidden after
instanceof.
Key: GROOVY-9967
URL: https://issues.apache.org/jira/browse/GROOVY-9967
Project: Groovy
Issue Type: Bug
Components: Static compilation, Static Type Checker
Affects Versions: 4.0.0-alpha-2
Reporter: Stefanos Chaliasos
I have the following Groovy program.
{code:groovy}
class Test {
static void main(String[] args) {
println(C.func4(new B()))
}
}
class A {}
class B extends A {
// It has the same behavior if f is a field instead of a property.
String f = "foo"
}
@groovy.transform.CompileStatic
class C {
static String func1(Object x) {
(x instanceof String) ? x : "foo" // Compiles
}
static String func2(B x) {
x.f // Compiles
}
static String func3(B x) {
(x instanceof B) ? x.f : "foo" // Compiles
}
static String func4(A x) {
(x instanceof B) ? x.f : "foo" // Does not compile
}
}
{code}
h2. Actual Behavior
The program does not compile, and I get the following error.
{code:java}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Test.groovy: 28: Access to A#f is forbidden @ line 28, column 24.
(x instanceof B) ? x.f : "foo"
^
1 error
{code}
h2. Expected Behavior
Compile successfully.
h2. Comment
This should be a regression bug because it compiles with the 3.0.7 compiler.
If we declared classes A and B after C, then the program compiles successfully.
Specifically, the following program compiles without any errors.
{code:groovy}
class Test {
static void main(String[] args) {
println(C.func4(new B()))
}
}
@groovy.transform.CompileStatic
class C {
static String func1(Object x) {
(x instanceof String) ? x : "foo" // Compiles
}
static String func2(B x) {
x.f // Compiles
}
static String func3(B x) {
(x instanceof B) ? x.f : "foo" // Compiles
}
static String func4(A x) {
(x instanceof B) ? x.f : "foo" // Does not compile
}
}
class A {}
class B extends A {
// It has the same behavior if f is a field instead of a property.
String f = "foo"
}
{code}
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