[jira] [Updated] (GROOVY-9984) Wrong type inference when passing null

["Stefanos Chaliasos (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefanos Chaliasos updated GROOVY-9984:
---------------------------------------
    Component/s: Static Type Checker
                 Static compilation

> Wrong type inference when passing null
> --------------------------------------
>
>                 Key: GROOVY-9984
>                 URL: https://issues.apache.org/jira/browse/GROOVY-9984
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static compilation, Static Type Checker
>            Reporter: Stefanos Chaliasos
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 4.0.0-alpha-3
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> I have the following Groovy program.
> {code:groovy}
> @groovy.transform.CompileStatic
> public class Main {
>   public static void main(String[] args) {
>     final A<Integer> x = new A<>(null);
>     baz(x);
>   }
>   public static void baz(A<Integer> x) {}
> }
> class A<T> {
>   T f;
>   public A(T f) {
>     this.f = f;
>   }
> }
> {code}
> h2. Actual Behavior
> The program does not compile, and I get the following error.
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> Test.groovy: 4: [Static type checking] - Incompatible generic argument types. Cannot assign A <java.lang.Object> to: A <Integer>
>  @ line 4, column 26.
>        final A<Integer> x = new A<>(null);
>                             ^
> Test.groovy: 5: [Static type checking] - Cannot call Main#baz(A <java.lang.Integer>) with arguments [A <java.lang.Object>]
>  @ line 5, column 5.
>        baz(x);
>        ^
> 2 errors
> {code}
> h2. Expected Behavior
> Compile successfully.
> h2. Comment
> This should be a regression bug because it compiles with the 4.0.0-alpha-2 compiler.
> h2. Affected Version
> This programs fails when compiled with the compiler from the master (commit: f0eea862549529ef4e93fafe337f86dd4ac98751).



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