Thodoris Sotiropoulos created GROOVY-10324:
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Summary: STC is unable to infer type variable when combining
parameterized types and the diamond operator
Key: GROOVY-10324
URL: https://issues.apache.org/jira/browse/GROOVY-10324
Project: Groovy
Issue Type: Bug
Reporter: Thodoris Sotiropoulos
I have the following program
{code:java}
class A {
<T> T foo(C<T> t) { return null; }
}
class C<T> {}
class B {
void test() {
C<String> x = (new A()).foo(new C<>());
}
}
{code}
h3. Actual behaviour
{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 12: [Static type checking] - Cannot assign value of type
java.lang.Object to variable of type C<java.lang.String>
@ line 12, column 19.
C<String> x = (new A()).foo(new C<>());
^
1 error
{code}
h3. Expected behaviour
Compile successfully
Note that compilation fails only if the expected return type is parameterized
(i.e., `D<String>`). If I replace the declared type of `x` with a regular type
(i.e., `String`), the code compiles fine.
Tested against master.
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