FIR: introduce FunInterfaceDeclarationChecker

compiler/fir/analysis-tests/testData/resolve/funInterfaceDeclaration.fir.txt

@@ -0,0 +1,55 @@
+FILE: funInterfaceDeclaration.kt
+    public abstract interface Test1 : R|kotlin/Any| {
+        public abstract fun foo(): R|kotlin/Unit|
+
+        public abstract fun boo(): R|kotlin/Unit|
+
+    }
+    public abstract interface Test2 : R|kotlin/Any| {
+    }
+    public abstract interface Test3 : R|kotlin/Any| {
+        public abstract val a: R|kotlin/Int|
+            public get(): R|kotlin/Int|
+
+        public abstract fun foo(): R|kotlin/Unit|
+
+    }
+    public abstract interface Test4 : R|kotlin/Any| {
+        public abstract fun <T> foo(a: R|T|): R|kotlin/Unit|
+
+    }
+    public abstract interface Test5 : R|kotlin/Any| {
+        public abstract fun foo(a: R|kotlin/Int| = Int(5)): R|kotlin/Unit|
+
+    }
+    public abstract interface Test6 : R|kotlin/Any| {
+        public abstract suspend fun foo(): R|kotlin/Unit|
+
+    }
+    public abstract interface Test7 : R|kotlin/Any| {
+        public abstract fun foo(): R|kotlin/Unit|
+
+    }
+    public abstract interface Test8 : R|Test7| {
+        public abstract fun boo(): R|kotlin/Unit|
+
+    }
+    public abstract interface Test9 : R|kotlin/Any| {
+        public open fun num(m: R|kotlin/Int|): R|kotlin/Int| {
+            ^num R|<local>/m|.R|kotlin/Int.times|(R|<local>/m|)
+        }
+
+    }
+    public abstract interface Test10 : R|Test9| {
+        public abstract fun test(): R|kotlin/Unit|
+
+    }
+    public abstract interface Test11 : R|kotlin/Any| {
+        public abstract val a: R|kotlin/Int|
+            public get(): R|kotlin/Int|
+
+    }
+    public abstract interface Test12 : R|Test11| {
+        public abstract fun test(): R|kotlin/Unit|
+
+    }

compiler/fir/analysis-tests/testData/resolve/funInterfaceDeclaration.kt

@@ -0,0 +1,38 @@
+<!FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS!>fun<!> interface Test1{
+    fun foo()
+    fun boo()
+}
+<!FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS!>fun<!> interface Test2 {}
+fun interface Test3 {
+    <!FUN_INTERFACE_CANNOT_HAVE_ABSTRACT_PROPERTIES!>val<!> a: Int
+    fun foo()
+}
+fun interface Test4{
+    fun <<!FUN_INTERFACE_ABSTRACT_METHOD_WITH_TYPE_PARAMETERS!>T<!>> foo(a: T)
+}
+fun interface Test5{
+    fun foo(<!FUN_INTERFACE_ABSTRACT_METHOD_WITH_DEFAULT_VALUE!>a: Int = 5<!>)
+}
+fun interface Test6{
+    suspend fun foo()
+}
+fun interface Test7{
+    fun foo()
+}
+<!FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS!>fun<!> interface Test8: Test7{
+    fun boo()
+}
+interface Test9 {
+    fun num(m: Int): Int {
+        return m * m
+    }
+}
+fun interface Test10 : Test9 {
+    fun test()
+}
+interface Test11 {
+    val a: Int
+}
+<!FUN_INTERFACE_CANNOT_HAVE_ABSTRACT_PROPERTIES!>fun<!> interface Test12 : Test11 {
+    fun test()
+}

compiler/fir/analysis-tests/testData/resolve/samConversions/kotlinSam.kt

@@ -2,11 +2,11 @@ fun interface MyRunnable {
     fun foo(x: Int): Boolean
 }
 
-fun interface WithProperty {
-    val x: Int
+<!FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS!>fun<!> interface WithProperty {
+    <!FUN_INTERFACE_CANNOT_HAVE_ABSTRACT_PROPERTIES!>val<!> x: Int
 }
 
-fun interface TwoAbstract : MyRunnable {
+<!FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS!>fun<!> interface TwoAbstract : MyRunnable {
     fun bar()
 }