Report an error when variance is specified for a function or property type parameter

compiler/testData/diagnostics/tests/declarationChecks/VarianceOnFunctionAndPropertyTypeParameters.kt

@@ -0,0 +1,17 @@
+fun <<!VARIANCE_ON_FUNCTION_OR_PROPERTY_PARAMETER!>in<!> T> f() {
+    
+}
+
+fun <<!VARIANCE_ON_FUNCTION_OR_PROPERTY_PARAMETER!>out<!> T> g() {
+
+}
+
+fun <<!VARIANCE_ON_FUNCTION_OR_PROPERTY_PARAMETER!>out<!> T, <!VARIANCE_ON_FUNCTION_OR_PROPERTY_PARAMETER!>in<!> X, Y> h() {
+
+}
+
+val <<!VARIANCE_ON_FUNCTION_OR_PROPERTY_PARAMETER!>out<!> T> T.x: Int
+    get() = 1
+
+val <<!VARIANCE_ON_FUNCTION_OR_PROPERTY_PARAMETER!>in<!> T> T.y: Int
+    get() = 1

compiler/testData/diagnostics/tests/inference/listConstructor.kt

@@ -22,7 +22,7 @@ fun test() {
 
 fun arrayList<T>(vararg values: T) : ArrayList<T> = values.toCollection(ArrayList<T>(values.size))
 
-fun <in T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
+fun <T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
     for (element in this) result.add(element)
     return result
 }

compiler/testData/diagnostics/tests/inference/regressions/kt1718.kt

@@ -12,4 +12,4 @@ fun test() {
 
 //from library
 fun arrayList<T>(vararg <!UNUSED_PARAMETER!>values<!>: T) : ArrayList<T> {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
-fun <in T> Iterable<T>.plus(<!UNUSED_PARAMETER!>elements<!>: Iterable<T>): List<T> {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+fun <T> Iterable<T>.plus(<!UNUSED_PARAMETER!>elements<!>: Iterable<T>): List<T> {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>

compiler/testData/diagnostics/tests/inference/regressions/kt2179.kt

@@ -35,7 +35,7 @@ fun <T, R, C: MutableCollection<in R>> Collection<T>.mapTo(result: C, transform
   return result
 }
 
-fun <in T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
+fun <T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
     for (element in this) result.add(element)
     return result
 }

compiler/testData/diagnostics/tests/inference/regressions/kt2324.kt

@@ -27,7 +27,7 @@ fun assertEquals(<!UNUSED_PARAMETER!>expected<!>: Any?, <!UNUSED_PARAMETER!>actu
 
 fun arrayList<T>(vararg values: T) : ArrayList<T> = values.toCollection(ArrayList<T>(values.size))
 
-fun <in T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
+fun <T, C: MutableCollection<in T>> Array<T>.toCollection(result: C) : C {
     for (element in this) result.add(element)
     return result
 }