48 lines
1.6 KiB
Java
48 lines
1.6 KiB
Java
/*
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* @test /nodynamiccopyright/
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* @bug 8016081 8016178
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* @summary structural most specific and stuckness
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* @compile/fail/ref=T8016177c.out -XDrawDiagnostics T8016177c.java
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*/
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class T8016177c {
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interface Function<X, Y> {
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Y m(X x);
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}
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interface ExtFunction<X, Y> extends Function<X, Y> { }
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<U, V> U m1(Function<U, V> f) { return null; }
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<U, V> U m1(ExtFunction<U, V> f) { return null; }
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void m2(Function<Integer, Integer> f) { }
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void m2(ExtFunction<Integer, Integer> f) { }
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void m3(Function<Integer, Integer> f) { }
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void m3(ExtFunction<Object, Integer> f) { }
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int g1(Object s) { return 1; }
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int g2(Number s) { return 1; }
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int g2(Object s) { return 1; }
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void test() {
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m1((Integer x)->x); //ok - explicit lambda - subtyping picks most specific
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m2((Integer x)->x); //ok - explicit lambda - subtyping picks most specific
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m3((Integer x)->x); //ok - explicit lambda (only one applicable)
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m1(x->1); //ok - stuck lambda but nominal most specific wins
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m2(x->1); //ok - stuck lambda but nominal most specific wins
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m3(x->1); //ambiguous - implicit lambda & different params
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m1(this::g1); //ok - unambiguous ref - subtyping picks most specific
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m2(this::g1); //ok - unambiguous ref - subtyping picks most specific
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m3(this::g1); //ambiguous - both applicable, neither most specific
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m1(this::g2); //ok - stuck mref but nominal most specific wins
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m2(this::g2); //ok - stuck mref but nominal most specific wins
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m3(this::g2); //ambiguous - different params
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}
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}
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