[jira] [Commented] (GROOVY-7888) Type checker infers wrong type collection plus assignment (+=) for property on Java class

["Paul King (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-7888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429675#comment-15429675 ] 

Paul King commented on GROOVY-7888:
-----------------------------------

A smaller self-contained example illustrating the problem:
{code}
class ContainsSet { void setFiles(Set<File> files) { } }
@groovy.transform.TypeChecked modifyIdeaModel(ContainsSet set) { set.files += new File('foo') }
modifyIdeaModel(new ContainsSet())
{code}

> Type checker infers wrong type collection plus assignment (+=) for property on Java class
> -----------------------------------------------------------------------------------------
>
>                 Key: GROOVY-7888
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7888
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>    Affects Versions: 2.4.7
>            Reporter: Stefan Wolf
>
> Given the Java class
> {code}
> public class ContainsSet extends GroovyObjectSupport {
>     private Set<File> files = new HashSet<File>();
>     public Set<File> getFiles() {
>         return files;
>     }
>     public void setFiles(Set<File> files) {
>         this.files = files;
>     }
> }
> {code}
> the following Groovy code will not type check:
> {code}
> @TypeChecked
> private Set<File> modifyIdeaModel() {
>     set.files += new File('foo')
> }
> {code}
> The failure is: 
> {code}
> Error: Groovyc: [Static type checking] - Cannot assign value of type java.io.File to variable of type java.util.Set <java.io.File>
> {code}
> Without the {{@TypeChecked}} the code runs with dynamic Groovy.
> Using the following Groovy class type checking the code above works.
> {code}
> class ContainsSet {
>     Set<File> files = new HashSet<>()
> }
> {code}



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