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Posted to notifications@groovy.apache.org by "Alexey Afanasiev (JIRA)" <ji...@apache.org> on 2017/09/26 14:26:00 UTC
[jira] [Updated] (GROOVY-8330) Wrong 'Inconvertible types' error on
casting interface
[ https://issues.apache.org/jira/browse/GROOVY-8330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alexey Afanasiev updated GROOVY-8330:
-------------------------------------
Description:
{code}
import groovy.transform.CompileStatic
interface A1{}
interface A2 extends A1{}
class C1 implements A1{}
class C2 extends C1 implements A2 {}
@CompileStatic
def m(A2 a2) {
C1 c1 = (C1) a2 // There is error here now: Inconvertible types: cannot cast A2 to C1
}
{code}
JLS handle this situation in 5.1.6.1 :
__A narrowing reference conversion exists from reference type S to reference type T
if ...... - S is an interface type, T is a class type, and T does not name a final class.__
was:
{code}
import groovy.transform.CompileStatic
interface A1{}
interface A2 extends A1{}
class C1 implements A1{}
class C2 extends C1 implements A2 {}
@CompileStatic
def m(A2 a2) {
C1 c1 = (C1) a2 // There is error here now: Inconvertible types: cannot cast A2 to C1
}
{code}
JLS handle this situation in 5.1.6.1 :
_A narrowing reference conversion exists from reference type S to reference type T
if ...... - S is an interface type, T is a class type, and T does not name a final class._
> Wrong 'Inconvertible types' error on casting interface
> -------------------------------------------------------
>
> Key: GROOVY-8330
> URL: https://issues.apache.org/jira/browse/GROOVY-8330
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation, Static Type Checker
> Affects Versions: 2.4.12
> Reporter: Alexey Afanasiev
>
> {code}
> import groovy.transform.CompileStatic
> interface A1{}
> interface A2 extends A1{}
>
> class C1 implements A1{}
> class C2 extends C1 implements A2 {}
>
> @CompileStatic
> def m(A2 a2) {
> C1 c1 = (C1) a2 // There is error here now: Inconvertible types: cannot cast A2 to C1
> }
> {code}
> JLS handle this situation in 5.1.6.1 :
> __A narrowing reference conversion exists from reference type S to reference type T
> if ...... - S is an interface type, T is a class type, and T does not name a final class.__
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