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From "Daniel Sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GROOVY-8445) Static analysis does not work properly when coercing Closure to FunctionInterface
Date Fri, 12 Jan 2018 15:11:00 GMT
Daniel Sun created GROOVY-8445:
----------------------------------

             Summary: Static analysis does not work properly when coercing Closure to FunctionInterface
                 Key: GROOVY-8445
                 URL: https://issues.apache.org/jira/browse/GROOVY-8445
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
    Affects Versions: 2.6.0-alpha-2, 2.4.13, 2.5.0-beta-2, 3.0.0-alpha-1
            Reporter: Daniel Sun


The following code fails when executing in static compilation mode.

{code:java}
        import groovy.transform.CompileStatic
        import java.util.stream.Collectors
        import java.util.stream.Stream
        
        @CompileStatic     // if we comment this line, the code works in dynamic mode.
        public class Test1 {
            public static void main(String[] args) {
                p();
            }
            
            public static void p() {
                assert 13 == Stream.of(1, 2, 3).reduce(7, {r, e -> r + e});
            }
        }
{code}

Here is the error message:
{code}
[Static type checking] - Cannot find matching method java.util.stream.Stream#reduce(int, groovy.lang.Closure).
Please check if the declared type is correct and if the method exists.
 at line: 12, column: 30

[Static type checking] - Cannot find matching method java.lang.Object#plus(java.lang.Object).
Please check if the declared type is correct and if the method exists.
 at line: 12, column: 68
{code}

Similarly, the following code fails in static compilation mode too:

{code:java}
        import groovy.transform.CompileStatic
        import java.util.stream.Collectors
        import java.util.stream.Stream
        
        @CompileStatic  // if we comment this line, the code works in dynamic mode.
        public class Test1 {
            public static void main(String[] args) {
                p();
            }
            
            public static void p() {
                def list = [1, 2, 3]
                list.replaceAll { e -> e + 10 }
                assert [11, 12, 13] == list
            }
        }
{code}

Here is the error message:

{code}
[Static type checking] - Cannot find matching method java.util.List#replaceAll(groovy.lang.Closure).
Please check if the declared type is correct and if the method exists.
 at line: 13, column: 17

[Static type checking] - Cannot find matching method java.lang.Object#plus(int). Please check
if the declared type is correct and if the method exists.
 at line: 13, column: 40


{code}






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