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https://issues.apache.org/jira/browse/GROOVY-11012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17718061#comment-17718061
]
Eric Milles commented on GROOVY-11012:
--------------------------------------
This script hits on a different error. In Groovy, an interface with a default
method is implemented as a trait.
{code:groovy}
/*interface Bar<T> {
default T get(x,y) { }
}*/
trait Bar<T> {
T get(x,y) {
}
}
class Foo<V> implements Bar<V> {
static <V> Foo<V> create() { }
}
@TypeChecked test(Foo<Number> foo) {
Number x = foo.get(null, null) // Cannot assign value of type Object to
variable of type Number
}
test(Foo.<Number>create())
{code}
> Wrong type is inferred when calling method defined in the parent class
> ----------------------------------------------------------------------
>
> Key: GROOVY-11012
> URL: https://issues.apache.org/jira/browse/GROOVY-11012
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Minor
>
> I have the following program
> {code}
> interface Bar<V> {
> default V get(Object x, Object y) { return null; }
> }
> class Foo<V> implements Bar<V> {
> static <V> Foo<V> create() { return null; }
> }
> class Main {
> static final void test() {
> Number x = Foo.<Number>create().get(null, null);
> }
> }
> {code}
> h3. Actual behavior
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> test.groovy: 11: [Static type checking] - Cannot assign value of type
> java.lang.Object to variable of type java.lang.Number
> @ line 11, column 16.
> Number x = Foo.<Number>create().get(null, null);
> ^
> 1 error
> {code}
> h3. Expected behavior
> Compile successfully
> h3. Notes
> Tested against master (commit: 5bcd83e0fde722971f97d479f1a4d6da6cd4aa5f)
> Test cased adapt from the following program that uses the Guava lib
> {code}
> import com.google.common.collect.HashBasedTable;
> class Main {
> static final void test() {
> Number x = HashBasedTable.<Number, Number, Number>create().get(null,
> null);
> }
> }
> {code}
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