"as" in binary / unary expressions now checked only for original type conversion #KT-10384 Fixed

Also #KT-10386 Fixed

compiler/testData/diagnostics/tests/cast/AsInBinaryUnary.kt

@@ -0,0 +1,30 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface Base
+
+class Impl1 : Base
+
+class Impl2 : Base
+
+operator fun Base.plus(arg: Base) = Impl1()
+
+operator fun Impl2.plus(arg: Base) = Impl2()
+
+operator fun Base.plus(arg: Impl2) = Impl2()
+
+operator fun Base.unaryMinus() = Impl1()
+
+operator fun Impl2.unaryMinus() = Impl2()
+
+// See also KT-10384: in non-error functions, as is necessary!
+fun add1(x: Impl2, y: Base): Impl1 = x as Base + y
+
+fun error1(x: Impl2, y: Base): Impl1 = <!TYPE_MISMATCH!>x + y<!>
+
+fun add2(x: Base, y: Impl2): Impl1 = x + y as Base
+
+fun error2(x: Base, y: Impl2): Impl1 = <!TYPE_MISMATCH!>x + y<!>
+
+fun minus3(x: Impl2): Impl1 = -(x as Base)
+
+fun error3(x: Impl2): Impl1 = <!TYPE_MISMATCH!>-x<!>

compiler/testData/diagnostics/tests/cast/AsInBinaryUnary.txt

@@ -0,0 +1,33 @@
+package
+
+public fun add1(/*0*/ x: Impl2, /*1*/ y: Base): Impl1
+public fun add2(/*0*/ x: Base, /*1*/ y: Impl2): Impl1
+public fun error1(/*0*/ x: Impl2, /*1*/ y: Base): Impl1
+public fun error2(/*0*/ x: Base, /*1*/ y: Impl2): Impl1
+public fun error3(/*0*/ x: Impl2): Impl1
+public fun minus3(/*0*/ x: Impl2): Impl1
+public operator fun Base.plus(/*0*/ arg: Base): Impl1
+public operator fun Base.plus(/*0*/ arg: Impl2): Impl2
+public operator fun Impl2.plus(/*0*/ arg: Base): Impl2
+public operator fun Base.unaryMinus(): Impl1
+public operator fun Impl2.unaryMinus(): Impl2
+
+public interface Base {
+    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 open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Impl1 : Base {
+    public constructor Impl1()
+    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 open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Impl2 : Base {
+    public constructor Impl2()
+    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 open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}