[jira] [Commented] (GROOVY-11009) STC resolves wrong method reference

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

    [ https://issues.apache.org/jira/browse/GROOVY-11009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17713750#comment-17713750 ] 

Eric Milles commented on GROOVY-11009:
--------------------------------------

The method reference has 2 methods that may satisfy:
# the static method declared by Main
# the instance method declared by Object

STC does not remove #2 from the candidate list and then subsequent parameter and return type checks aren't strictly limited to the type parameter "T".

> STC resolves wrong method reference
> -----------------------------------
>
>                 Key: GROOVY-11009
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11009
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>            Reporter: Thodoris Sotiropoulos
>            Assignee: Eric Milles
>            Priority: Minor
>
> This is probably a regression
> I have the following program
> {code}
> import java.util.function.*;
> class Main {
>   static final void test() {
>     final Function<Double, Double> x = Main::clone;
>   }
>   public static <T> T clone(T x) { return x; }
> }
> {code}
> h3. Actual behavior
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> test.groovy: 5: [Static type checking] - Invalid return type: java.lang.Object is not convertible to java.lang.Double
>  @ line 5, column 40.
>        final Function<Double, Double> x = Main::clone;
>                                           ^
> 1 error
> {code}
> h3. Expected behavior
> Compile successfully
> h3. Notes
> Tested against master (commit: c4ee3ce0661eec7d633fc81281d79c8889b3dc66)
> Test case adapted from:
> {code}
> import java.util.function.*;
> class Main {
>   static final void test() {
>     Function<Double, Double> x = org.apache.commons.lang3.ObjectUtils::clone;
>   }
> }
> {code}



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