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>
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/params/FormalParams.java

@@ -16,4 +16,20 @@ class Foo {
     bar((int i) -> {System.out.println(i);});
   } 
   void bar(I i){}
+}
+
+class ReturnTypeCompatibility {
+
+    interface I1<L> {
+        L m(L x);
+    }
+
+    static <P> void call(I1<P> i2) {
+        i2.m(null);
+    }
+
+    public static void main(String[] args) {
+        call((String i)->{ return i;});
+        call<error descr="'call(ReturnTypeCompatibility.I1<java.lang.Object>)' in 'ReturnTypeCompatibility' cannot be applied to '(<lambda expression>)'">((int i)->{ return i;})</error>;
+    }
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/params/InferredParams.java

@@ -1,3 +1,5 @@
+import java.lang.Integer;
+
 interface I {
   void m(int i);
 }
@@ -18,6 +20,14 @@ class Foo {
     <error descr="Incompatible types. Found: 'java.lang.String', required: 'int'">int i = ab;</error>
   };
 
+  {
+    A<String> a1;
+    a1 = (ab)->{
+      String s = ab;
+      <error descr="Incompatible types. Found: 'java.lang.String', required: 'int'">int i = ab;</error>
+    };
+  }
+  
   A<Integer> bazz() {
     bar((o) -> {
       String s = o;
@@ -33,3 +43,18 @@ class Foo {
   void bar(A<String> a){}
 }
 
+class CastInference {
+  public interface I1<X> {
+    X m();
+  }
+  public interface I2<X> {
+    X m();
+  }
+  public static <X> void foo(I1<X> s) {}
+  public static <X> void foo(I2<X> s) {}
+
+  public static void main(String[] args) {
+    foo((I1<Integer>)() -> 42);
+    I1<Integer> i1 = (I1<Integer>)() -> 42;
+  }
+}