jdk-24/test/langtools/tools/javac/ConditionalWithVoid.java

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/*
* @test /nodynamiccopyright/
* @bug 4974927 8064464
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* @summary The compiler was allowing void types in its parsing of conditional expressions.
* @author tball
*
* @compile/fail/ref=ConditionalWithVoid.out -XDrawDiagnostics ConditionalWithVoid.java
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*/
public class ConditionalWithVoid {
public void test(Object o, String s) {
// Should fail to compile since Object.wait() has a void return type. Poly case.
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System.out.println(o instanceof String ? o.hashCode() : o.wait());
// Should fail to compile since Object.wait() has a void return type. Standalone case.
(o instanceof String ? o.hashCode() : o.wait()).toString();
// Should fail to compile since Object.wait() has a void return type. Poly case.
System.out.println(switch (s) {case "" -> o.hashCode(); default -> o.wait();});
// Should fail to compile since Object.wait() has a void return type. Standalone case.
(switch (s) {case "" -> o.hashCode(); default -> o.wait();}).toString();
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}
}