langtools/test/tools/javac/lambda/TargetType66.java

/*
 * @test /nodynamiccopyright/
 * @bug 8009131
 * @summary Overload: javac should discard methods that lead to errors in lambdas with implicit parameter types
 * @compile/fail/ref=TargetType66.out -XDrawDiagnostics TargetType66.java
 */
class TargetType66 {
    interface SAM1 {
        void m(String s);
    }

    interface SAM2 {
        void m(Integer s);
    }

    void g(SAM1 s1) { }
    void g(SAM2 s2) { }

    void test() {
        g(x->{ String s = x; }); //ambiguous
        g(x->{ Integer i = x; }); //ambiguous
        g(x->{ Object o = x; }); //ambiguous
        g(x->{ Character c = x; }); //error: inapplicable methods
        g(x->{ Character c = ""; }); //error: incompatible types
    }
}