Expected function type used for parameter types inference in function expression

compiler/testData/diagnostics/tests/functionAsExpression/FunctionType.kt

@@ -17,7 +17,7 @@ fun testParamType() {
     bar.checkType { it : _<(String) -> Unit> }
 
     val bas: (String) -> Unit = fun (param: String) {}
-    val bag: (Int) -> Unit = <!TYPE_MISMATCH!>fun (param: String) {}<!>
+    val bag: (Int) -> Unit = <!TYPE_MISMATCH!>fun (<!EXPECTED_PARAMETER_TYPE_MISMATCH!>param: String<!>) {}<!>
 }
 
 fun testReceiverType() {

compiler/testData/diagnostics/tests/functionAsExpression/MissingParameterTypes.kt

@@ -0,0 +1,25 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
+
+val a = fun (<!CANNOT_INFER_PARAMETER_TYPE!>x<!>) = <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x<!>
+
+val b: (Int) -> Int = fun (x) = x + 3
+
+val c: (Int, String) -> Int = <!TYPE_MISMATCH!>fun <!EXPECTED_PARAMETERS_NUMBER_MISMATCH!>(x)<!> = 3<!>
+
+val d: (Int, String) -> Int = <!TYPE_MISMATCH!>fun <!EXPECTED_PARAMETERS_NUMBER_MISMATCH!>(x)<!> = 3<!>
+
+val e: (Int, String) -> Int = <!TYPE_MISMATCH!>fun <!EXPECTED_PARAMETERS_NUMBER_MISMATCH!>(<!EXPECTED_PARAMETER_TYPE_MISMATCH!>x: String<!>)<!> = 3<!>
+
+val f: (Int) -> Int = <!TYPE_MISMATCH!>fun (<!EXPECTED_PARAMETER_TYPE_MISMATCH!>x: String<!>) = 3<!>
+
+fun test1(a: (Int) -> Unit) {
+    test1(fun (<!CANNOT_INFER_PARAMETER_TYPE!>x<!>) { <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>x<!> : Int})
+}
+
+fun test2(a: (Int) -> Unit) {
+    test2(<!TYPE_MISMATCH!>fun (x: String) {}<!>)
+}
+
+fun test3(a: (Int, String) -> Unit) {
+    test3(<!TYPE_MISMATCH!>fun (x: String) {}<!>)
+}

compiler/testData/diagnostics/tests/functionAsExpression/MissingParameterTypes.txt

@@ -0,0 +1,11 @@
+package
+
+internal val a: (???) -> [ERROR : Cannot be inferred]
+internal val b: (kotlin.Int) -> kotlin.Int
+internal val c: (kotlin.Int, kotlin.String) -> kotlin.Int
+internal val d: (kotlin.Int, kotlin.String) -> kotlin.Int
+internal val e: (kotlin.Int, kotlin.String) -> kotlin.Int
+internal val f: (kotlin.Int) -> kotlin.Int
+internal fun test1(/*0*/ a: (kotlin.Int) -> kotlin.Unit): kotlin.Unit
+internal fun test2(/*0*/ a: (kotlin.Int) -> kotlin.Unit): kotlin.Unit
+internal fun test3(/*0*/ a: (kotlin.Int, kotlin.String) -> kotlin.Unit): kotlin.Unit