[jira] [Commented] (GROOVY-10347) STC: lowed bound wildcard inference produces false positives

["Eric Milles (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-10347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17439454#comment-17439454 ] 

Eric Milles commented on GROOVY-10347:
--------------------------------------

Another example:
{code:groovy}
@groovy.transform.TypeChecked
void test() {
  String[] one = ['foo','bar'], two = ['baz']
  Map<String,Integer> map = one.collectEntries{[it,1]} + two.collectEntries{[it,2]}
  print map
}
{code}

> STC: lowed bound wildcard inference produces false positives
> ------------------------------------------------------------
>
>                 Key: GROOVY-10347
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10347
>             Project: Groovy
>          Issue Type: Bug
>            Reporter: Eric Milles
>            Assignee: Eric Milles
>            Priority: Minor
>
> Follow up from GROOVY-10339 and possibly related to GROOVY-10047, GROOVY-9998 and GROOVY-9803.  Consider the following:
> {code:groovy}
> class Pogo {
>   String x
> }
> class Sorter implements Comparator<Pogo>, Serializable {
>   int compare(Pogo p1, Pogo p2) { p1.x <=> p2.x }
> }
> @groovy.transform.TypeChecked
> void test(Pogo[] pogos) {
>   List<String> strings = pogos.sort(true, new Sorter()).collect { Pogo pogo ->
>     pogo.x
>   }
>   print strings
> }
> test(new Pogo(x:'foo'),new Pogo(x:'bar'))
> {code}
> Current STC has difficulty with multiple type witnesses for the "sort" call, which supplies {{Pogo[]}} for {{T[]}} and {{Sorter}} for {{Comparator<? super T>}}.
> STC errors:
> {code}
> Incompatible generic argument types. Cannot assign java.util.List<java.lang.Object> to: java.util.List<java.lang.String>
> Expected parameter of type java.lang.Object but got Pogo
> No such property: x for class: java.lang.Object
> {code}



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