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From "Alexey Afanasiev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GROOVY-8084) Captured types doesn't work in @CompileStatic
Date Mon, 27 Aug 2018 09:25:00 GMT

    [ https://issues.apache.org/jira/browse/GROOVY-8084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593379#comment-16593379
] 

Alexey Afanasiev commented on GROOVY-8084:
------------------------------------------

Glad to see that work on type inference and generics is continuing!

> 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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