[jira] [Updated] (GROOVY-10343) STC fails to infer dependent type variable

["Thodoris Sotiropoulos (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thodoris Sotiropoulos updated GROOVY-10343:
-------------------------------------------
    Description: 
I have the following program

{code:java}
class A<T1, T2 extends T1> {
  T1 f;

  A(T1 f) {
    this.f = f;
  }
  T2 foo() { return null; }
}

class Test {
  void test() {
    Integer x = 1;
    var y = new A<>(x).foo();
    Integer z = y;
  }
  
}
{code}

h3. Actual behavior

{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 14: [Static type checking] - Cannot assign value of type java.lang.Object to variable of type java.lang.Integer
 @ line 14, column 17.
       Integer z = y;
                   ^

1 error
{code}

h3. Expected behaviour

Compile successfully

Note that the program above compiles as expected in javac.

Tested against master (https://github.com/apache/groovy/commit/cee45d768bb65d1254a61a6dd4ce3c6a1f2ee3ca)

  was:
I have the following program

{code:java}
class A<T1, T2 extends T1> {
  T1 f;

  A(T1 f) {
    this.f = f;
  }
  T2 foo() { return null; }
}

class Test {
  void test() {
    Integer x = 1;
    var y = new A<>(x).foo();
    Integer z = y;
  }
  
}
{code}

h3. Actual behavior

{code}

{code}


> STC fails to infer dependent type variable
> ------------------------------------------
>
>                 Key: GROOVY-10343
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10343
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>            Reporter: Thodoris Sotiropoulos
>            Priority: Major
>
> I have the following program
> {code:java}
> class A<T1, T2 extends T1> {
>   T1 f;
>   A(T1 f) {
>     this.f = f;
>   }
>   T2 foo() { return null; }
> }
> class Test {
>   void test() {
>     Integer x = 1;
>     var y = new A<>(x).foo();
>     Integer z = y;
>   }
>   
> }
> {code}
> h3. Actual behavior
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> test.groovy: 14: [Static type checking] - Cannot assign value of type java.lang.Object to variable of type java.lang.Integer
>  @ line 14, column 17.
>        Integer z = y;
>                    ^
> 1 error
> {code}
> h3. Expected behaviour
> Compile successfully
> Note that the program above compiles as expected in javac.
> Tested against master (https://github.com/apache/groovy/commit/cee45d768bb65d1254a61a6dd4ce3c6a1f2ee3ca)



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