[FE 1.0] Introduce "range until operator" language feature, and report errors on its usages till 1.8

compiler/testData/diagnostics/tests/operatorsOverloading/until/custom.kt

@@ -1,3 +1,6 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +RangeUntilOperator
+
 class A {
     operator fun rangeUntil(other: A): Iterable<A> = TODO()
 }

compiler/testData/diagnostics/tests/operatorsOverloading/until/customDefault.kt

@@ -0,0 +1,9 @@
+class A {
+    operator fun rangeUntil(other: A): Iterable<A> = TODO()
+}
+
+fun main(n: A, f: A) {
+    for (i in f<!UNSUPPORTED_FEATURE("The feature "range until operator" is only available since language version 1.8")!>..<<!>n) {
+
+    }
+}

compiler/testData/diagnostics/tests/operatorsOverloading/until/customDefault.txt

@@ -0,0 +1,11 @@
+package
+
+public fun main(/*0*/ n: A, /*1*/ f: A): kotlin.Unit
+
+public final class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final operator fun rangeUntil(/*0*/ other: A): kotlin.collections.Iterable<A>
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/operatorsOverloading/until/customDisabled.fir.kt

@@ -0,0 +1,11 @@
+// !LANGUAGE: -RangeUntilOperator
+
+class A {
+    operator fun rangeUntil(other: A): Iterable<A> = TODO()
+}
+
+fun main(n: A, f: A) {
+    for (i in f..<n) {
+
+    }
+}

compiler/testData/diagnostics/tests/operatorsOverloading/until/customDisabled.kt

@@ -0,0 +1,11 @@
+// !LANGUAGE: -RangeUntilOperator
+
+class A {
+    operator fun rangeUntil(other: A): Iterable<A> = TODO()
+}
+
+fun main(n: A, f: A) {
+    for (i in f<!UNSUPPORTED_FEATURE("The feature "range until operator" is only available since language version 1.8")!>..<<!>n) {
+
+    }
+}

compiler/testData/diagnostics/tests/operatorsOverloading/until/customDisabled.txt

@@ -0,0 +1,11 @@
+package
+
+public fun main(/*0*/ n: A, /*1*/ f: A): kotlin.Unit
+
+public final class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final operator fun rangeUntil(/*0*/ other: A): kotlin.collections.Iterable<A>
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/operatorsOverloading/until/simple.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +RangeUntilOperator
+
 fun main(n: Int) {
     for (i in <!ITERATOR_MISSING!>0<!UNRESOLVED_REFERENCE!>..<<!>n<!>) {
 

compiler/testData/diagnostics/tests/operatorsOverloading/until/simple.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +RangeUntilOperator
+
 fun main(n: Int) {
     for (i in 0<!UNRESOLVED_REFERENCE!>..<<!>n) {