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https://issues.apache.org/jira/browse/GROOVY-8084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17897281#comment-17897281
]
ASF GitHub Bot commented on GROOVY-8084:
----------------------------------------
eric-milles opened a new pull request, #2121:
URL: https://github.com/apache/groovy/pull/2121
When comparing method call arguments to parameters, wildcard generics are
considered captured. Thus, they are not compatible with other types.
https://docs.oracle.com/javase/tutorial/extra/generics/wildcards.html
**TODO:** The test case for GROOVY-10006 / GROOVY-10339 produces a wildcard
for `LowestUpperBoundClassNode` and so it fails
```groovy
def <T> void test(T x, T y, T z) { }
test(1,"II",Class) // Cannot call <T> test(T, T, T) with arguments [int,
String, Class]
```
> Captured types doesn't work in @CompileStatic
> ---------------------------------------------
>
> Key: GROOVY-8084
> URL: https://issues.apache.org/jira/browse/GROOVY-8084
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation, Static Type Checker
> Affects Versions: 2.4.8
> Reporter: Alexey Afanasiev
> Assignee: Daniel Sun
> Priority: Major
> Fix For: 3.0.0-alpha-4, 2.5.3
>
>
> This code could be successfully compiled and executed.
> {code}
> @CompileStatic
> static def method(List<? extends Serializable> captured) {
> captured.add('some string')
> return captured
> }
> println method(new ArrayList<Integer>())
> {code}
> Looks like type check in groovy doesn't work with captured types. Is it a bug?
> Is there any documentation about generics in groovy?
> P.S.:
> Another kind of strange behaviour:
> {code}
> @CompileStatic
> static def method() {
> List<Integer> list = new ArrayList<>()
> List<? extends Serializable> captured = list
> captured.add('some string') //Error:(7, 5) Groovyc: [Static type
> checking] - Cannot call java.util.ArrayList
> <java.lang.Integer>#add(java.lang.Integer) with arguments [java.lang.String]
> return captured
> }
> {code}
> Somehow type checking infered type of 'captured' variable to
> java.util.ArrayList <java.lang.Integer>
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