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Posted to notifications@groovy.apache.org by "Thodoris Sotiropoulos (Jira)" <ji...@apache.org> on 2023/04/07 13:45:00 UTC
[jira] [Created] (GROOVY-11004) Incompatible generic argument types when mixing diamond operator in parameterized function
Thodoris Sotiropoulos created GROOVY-11004:
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Summary: Incompatible generic argument types when mixing diamond operator in parameterized function
Key: GROOVY-11004
URL: https://issues.apache.org/jira/browse/GROOVY-11004
Project: Groovy
Issue Type: Bug
Components: Static Type Checker
Reporter: Thodoris Sotiropoulos
This might be a regression, as Groovy 4.0.10 accepts the program.
I have the following program
{code}
import java.util.*;
class Main {
static final void test() {
Map<Number, String> x = null;
Map<Number, String> y = Collections.unmodifiableNavigableMap(new TreeMap<>(x));
}
}
{code}
h3. Actual behavior
{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 6: [Static type checking] - Incompatible generic argument types. Cannot assign java.util.NavigableMap<java.lang.Object, java.lang.Object> to: java.util.Map<java.lang.Number, java.lang.String>
@ line 6, column 29.
Map<Number, String> y = Collections.unmodifiableNavigableMap(new TreeMap<>(x));
^
1 error
{code}
h3. Expected behavior
Compile successfully
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