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test/tools/javac/lambda/8016177/T8016177c.java@4a6acc42c3a1 (annotated)

test/tools/javac/lambda/8016177/T8016177c.java

Mon, 02 Sep 2013 22:38:36 +0100

author

vromero

date

Mon, 02 Sep 2013 22:38:36 +0100

changeset 2000

4a6acc42c3a1

parent 0

959103a6100f

permissions

-rw-r--r--

8016177: structural most specific and stuckness
Reviewed-by: jjg, vromero
Contributed-by: maurizio.cimadamore@oracle.com

aoqi@0	1	/*
aoqi@0	2	* @test /nodynamiccopyright/
aoqi@0	3	* @bug 8016081 8016178
aoqi@0	4	* @summary structural most specific and stuckness
aoqi@0	5	* @compile/fail/ref=T8016177c.out -XDrawDiagnostics T8016177c.java
aoqi@0	6	*/
aoqi@0	7
aoqi@0	8	class T8016177c {
aoqi@0	9
aoqi@0	10	interface Function<X, Y> {
aoqi@0	11	Y m(X x);
aoqi@0	12	}
aoqi@0	13
aoqi@0	14	interface ExtFunction<X, Y> extends Function<X, Y> { }
aoqi@0	15
aoqi@0	16	<U, V> U m1(Function<U, V> f) { return null; }
aoqi@0	17	<U, V> U m1(ExtFunction<U, V> f) { return null; }
aoqi@0	18
aoqi@0	19	void m2(Function<Integer, Integer> f) { }
aoqi@0	20	void m2(ExtFunction<Integer, Integer> f) { }
aoqi@0	21
aoqi@0	22	void m3(Function<Integer, Integer> f) { }
aoqi@0	23	void m3(ExtFunction<Object, Integer> f) { }
aoqi@0	24
aoqi@0	25	int g1(Object s) { return 1; }
aoqi@0	26
aoqi@0	27	int g2(Number s) { return 1; }
aoqi@0	28	int g2(Object s) { return 1; }
aoqi@0	29
aoqi@0	30	void test() {
aoqi@0	31	m1((Integer x)->x); //ok - explicit lambda - subtyping picks most specific
aoqi@0	32	m2((Integer x)->x); //ok - explicit lambda - subtyping picks most specific
aoqi@0	33	m3((Integer x)->x); //ok - explicit lambda (only one applicable)
aoqi@0	34
aoqi@0	35	m1(x->1); //ok - stuck lambda but nominal most specific wins
aoqi@0	36	m2(x->1); //ok - stuck lambda but nominal most specific wins
aoqi@0	37	m3(x->1); //ambiguous - implicit lambda & different params
aoqi@0	38
aoqi@0	39	m1(this::g1); //ok - unambiguous ref - subtyping picks most specific
aoqi@0	40	m2(this::g1); //ok - unambiguous ref - subtyping picks most specific
aoqi@0	41	m3(this::g1); //ambiguous - both applicable, neither most specific
aoqi@0	42
aoqi@0	43	m1(this::g2); //ok - stuck mref but nominal most specific wins
aoqi@0	44	m2(this::g2); //ok - stuck mref but nominal most specific wins
aoqi@0	45	m3(this::g2); //ambiguous - different params
aoqi@0	46	}
aoqi@0	47	}