lambda: return type checks initial

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/ReturnTypeCompatibility.java

@@ -0,0 +1,72 @@
+class ReturnTypeIncompatibility {
+
+    interface I1<T extends Number> {
+        T m(Integer x);
+    }
+
+    interface I2<L extends String> {
+        L m(Integer x);
+    }
+
+    interface I3<K> {
+        void m(Integer x);
+    }
+
+    static <P extends Number> void call(I1<P> i1) {
+        i1.m(1);
+    }
+
+    static <P extends String> void call(I2<P> i2) {
+        i2.m(2);
+    }
+
+    static <Q> void call(I3<Q> i3) {
+        i3.m(3);
+    }
+
+    public static void main(String[] args) {
+        call(i-> {return i;});
+    }
+}
+
+
+class ReturnTypeCompatibility {
+
+    interface I1<T extends Number> {
+        T m(T x);
+    }
+
+    interface I2<L extends String> {
+        L m(L x);
+    }
+
+    interface I3<K> {
+        void m(K x);
+    }
+
+    static <P extends Number> void call(I1<P> i1) {
+        i1.m(null);
+    }
+
+    static <P extends String> void call(I2<P> i2) {
+        i2.m(null);
+    }
+
+    static <Q> void call(I3<Q> i3) {
+        i3.m(null);
+    }
+
+    public static void main(String[] args) {
+        <error descr="Cannot resolve method 'call(<lambda expression>)'">call</error>(i-> {return i;});
+    }
+}
+
+class ReturnTypeChecks1 {
+
+    interface I<K extends Number, V extends Number> {
+       V m(K k);
+    }
+
+    I<Integer, Integer> accepted = i -> { return i; };
+    <error descr="Incompatible types. Found: '<lambda expression>', required: 'ReturnTypeChecks1.I<java.lang.Double,java.lang.Integer>'">I<Double, Integer> rejected = i -> { return i; };</error>
+}