Select most specific overloaded function/property by explicitly used arguments only.

Major rewrite of OverloadingConflictResolver.

compiler/testData/diagnostics/tests/resolve/overloadConflicts/extensionReceiverAndVarargs.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+object Right
+object Wrong
+
+interface IA
+interface IB : IA
+fun IA.foo(vararg x: Int) = Wrong
+fun IB.foo(vararg x: Int) = Right
+class CC : IB
+
+val test7 = CC().foo(1, 2, 3)

compiler/testData/diagnostics/tests/resolve/overloadConflicts/extensionReceiverAndVarargs.txt

@@ -0,0 +1,38 @@
+package
+
+public val test7: Right
+public fun IA.foo(/*0*/ vararg x: kotlin.Int /*kotlin.IntArray*/): Wrong
+public fun IB.foo(/*0*/ vararg x: kotlin.Int /*kotlin.IntArray*/): Right
+
+public final class CC : IB {
+    public constructor CC()
+    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 interface IA {
+    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 interface IB : IA {
+    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 object Right {
+    private constructor Right()
+    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 object Wrong {
+    private constructor Wrong()
+    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
+}

compiler/testData/diagnostics/tests/resolve/overloadConflicts/javaOverloadedVarargs.kt

@@ -0,0 +1,21 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// FILE: J.java
+import java.util.*
+
+public class J {
+    public static <E extends Enum<E>> String foo(E e) { return ""; }
+    public static <E extends Enum<E>> String foo(E e1, E e2) { return ""; }
+    public static <E extends Enum<E>> String foo(E s1, E s2, E s3) { return ""; }
+    public static <E extends Enum<E>> int foo(E... ss) { return 0; }
+}
+
+// FILE: test.kt
+enum class X { A }
+val a = X.A
+
+val test0: Int = J.foo<X>()
+val test1: String = J.foo(a)
+val test2: String = J.foo(a, a)
+val test3: String = J.foo(a, a, a)
+val test4: Int = J.foo(a, a, a, a)
+val test5: Int = J.foo(a, a, a, a, a)

compiler/testData/diagnostics/tests/resolve/overloadConflicts/javaOverloadedVarargs.txt

@@ -0,0 +1,40 @@
+package
+
+public val a: X
+public val test0: kotlin.Int
+public val test1: kotlin.String
+public val test2: kotlin.String
+public val test3: kotlin.String
+public val test4: kotlin.Int
+public val test5: kotlin.Int
+
+public open class J {
+    public constructor J()
+    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
+
+    // Static members
+    public open fun </*0*/ E : kotlin.Enum<E!>!> foo(/*0*/ e: E!): kotlin.String!
+    public open fun </*0*/ E : kotlin.Enum<E!>!> foo(/*0*/ e1: E!, /*1*/ e2: E!): kotlin.String!
+    public open fun </*0*/ E : kotlin.Enum<E!>!> foo(/*0*/ s1: E!, /*1*/ s2: E!, /*2*/ s3: E!): kotlin.String!
+    public open fun </*0*/ E : kotlin.Enum<E!>!> foo(/*0*/ vararg ss: E! /*kotlin.Array<(out) E!>!*/): kotlin.Int
+}
+
+public final enum class X : kotlin.Enum<X> {
+    enum entry A
+
+    private constructor X()
+    public final override /*1*/ /*fake_override*/ val name: kotlin.String
+    public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+    protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: X): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    @kotlin.Deprecated(level = DeprecationLevel.ERROR, message = "Use 'values()' function instead", replaceWith = kotlin.ReplaceWith(expression = "this.values()", imports = {})) public final /*synthesized*/ val values: kotlin.Array<X>
+    public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): X
+    public final /*synthesized*/ fun values(): kotlin.Array<X>
+}

compiler/testData/diagnostics/tests/resolve/overloadConflicts/numberOfDefaults.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+object Right
+object Wrong
+
+fun overloadedFun(c: Any = "", b: String = "", f: Any = "") = Right
+fun overloadedFun(b: Any = "", c: Any = "", e: String = "", x: String = "", y: String = "") = Wrong
+
+val test: Right = overloadedFun(b = "")
+

compiler/testData/diagnostics/tests/resolve/overloadConflicts/numberOfDefaults.txt

@@ -0,0 +1,19 @@
+package
+
+public val test: Right
+public fun overloadedFun(/*0*/ b: kotlin.Any = ..., /*1*/ c: kotlin.Any = ..., /*2*/ e: kotlin.String = ..., /*3*/ x: kotlin.String = ..., /*4*/ y: kotlin.String = ...): Wrong
+public fun overloadedFun(/*0*/ c: kotlin.Any = ..., /*1*/ b: kotlin.String = ..., /*2*/ f: kotlin.Any = ...): Right
+
+public object Right {
+    private constructor Right()
+    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 object Wrong {
+    private constructor Wrong()
+    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
+}

compiler/testData/diagnostics/tests/resolve/overloadConflicts/originalExamples.kt

@@ -0,0 +1,20 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+object Right
+object Wrong
+
+fun overloadedFun1(c: Any = "", b: String = "", f: Any = "") = Right
+fun overloadedFun1(b: Any = "", c: Any = "", e: String = "") = Wrong
+
+val test1: Right = overloadedFun1(b = "")
+val test1a: Wrong = <!TYPE_MISMATCH!>overloadedFun1(b = "")<!>
+
+fun overloadedFun2(a: String, b: Any = "") = Right
+fun overloadedFun2(a: Any, b: String = "") = Wrong
+
+val test2: Right = overloadedFun2("")
+
+fun overloadedFun2a(a: Any, b: String = "") = Wrong
+fun overloadedFun2a(a: String, b: Any = "") = Right
+
+val test2a: Right = overloadedFun2a("")

compiler/testData/diagnostics/tests/resolve/overloadConflicts/originalExamples.txt

@@ -0,0 +1,26 @@
+package
+
+public val test1: Right
+public val test1a: Wrong
+public val test2: Right
+public val test2a: Right
+public fun overloadedFun1(/*0*/ b: kotlin.Any = ..., /*1*/ c: kotlin.Any = ..., /*2*/ e: kotlin.String = ...): Wrong
+public fun overloadedFun1(/*0*/ c: kotlin.Any = ..., /*1*/ b: kotlin.String = ..., /*2*/ f: kotlin.Any = ...): Right
+public fun overloadedFun2(/*0*/ a: kotlin.Any, /*1*/ b: kotlin.String = ...): Wrong
+public fun overloadedFun2(/*0*/ a: kotlin.String, /*1*/ b: kotlin.Any = ...): Right
+public fun overloadedFun2a(/*0*/ a: kotlin.Any, /*1*/ b: kotlin.String = ...): Wrong
+public fun overloadedFun2a(/*0*/ a: kotlin.String, /*1*/ b: kotlin.Any = ...): Right
+
+public object Right {
+    private constructor Right()
+    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 object Wrong {
+    private constructor Wrong()
+    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
+}

compiler/testData/diagnostics/tests/resolve/overloadConflicts/varargs.kt

@@ -0,0 +1,11 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+object Right
+object Wrong
+
+fun overloadedFun6(s1: String) = Right
+fun overloadedFun6(s1: String, s2: String) = Wrong
+fun overloadedFun6(s1: String, s2: String, s3: String) = Wrong
+fun overloadedFun6(s: String, vararg ss: String) = Wrong
+
+val test6: Right = overloadedFun6("")

compiler/testData/diagnostics/tests/resolve/overloadConflicts/varargs.txt

@@ -0,0 +1,21 @@
+package
+
+public val test6: Right
+public fun overloadedFun6(/*0*/ s1: kotlin.String): Right
+public fun overloadedFun6(/*0*/ s: kotlin.String, /*1*/ vararg ss: kotlin.String /*kotlin.Array<out kotlin.String>*/): Wrong
+public fun overloadedFun6(/*0*/ s1: kotlin.String, /*1*/ s2: kotlin.String): Wrong
+public fun overloadedFun6(/*0*/ s1: kotlin.String, /*1*/ s2: kotlin.String, /*2*/ s3: kotlin.String): Wrong
+
+public object Right {
+    private constructor Right()
+    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 object Wrong {
+    private constructor Wrong()
+    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
+}

compiler/testData/diagnostics/tests/resolve/overloadConflicts/varargsInDifferentPositions.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+object X1
+object X2
+
+fun overloadedFun(arg: String, vararg args: String) = X1
+fun overloadedFun(arg: String, vararg args: String, flag: Boolean = true) = X2
+
+val test1a: X1 = overloadedFun("", "")
+val test1b: X1 = overloadedFun("", args = "")
+val test1c: X2 = overloadedFun("", "", "", flag = true)
+

compiler/testData/diagnostics/tests/resolve/overloadConflicts/varargsInDifferentPositions.txt

@@ -0,0 +1,21 @@
+package
+
+public val test1a: X1
+public val test1b: X1
+public val test1c: X2
+public fun overloadedFun(/*0*/ arg: kotlin.String, /*1*/ vararg args: kotlin.String /*kotlin.Array<out kotlin.String>*/): X1
+public fun overloadedFun(/*0*/ arg: kotlin.String, /*1*/ vararg args: kotlin.String /*kotlin.Array<out kotlin.String>*/, /*2*/ flag: kotlin.Boolean = ...): X2
+
+public object X1 {
+    private constructor X1()
+    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 object X2 {
+    private constructor X2()
+    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
+}

compiler/testData/diagnostics/tests/resolve/overloadConflicts/varargsMixed.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+object X1
+object X2
+
+fun overloadedFun5(vararg ss: String) = X1
+fun overloadedFun5(s: String, vararg ss: String) = X2
+
+val test1: X1 = <!OVERLOAD_RESOLUTION_AMBIGUITY!>overloadedFun5<!>("")
+val test2 = <!OVERLOAD_RESOLUTION_AMBIGUITY!>overloadedFun5<!>("", "")
+val test3: X2 = overloadedFun5(s = "", ss = "")
+val test4: X1 = overloadedFun5(ss = "")

compiler/testData/diagnostics/tests/resolve/overloadConflicts/varargsMixed.txt

@@ -0,0 +1,22 @@
+package
+
+public val test1: X1
+public val test2: [ERROR : Type for overloadedFun5("", "")]
+public val test3: X2
+public val test4: X1
+public fun overloadedFun5(/*0*/ vararg ss: kotlin.String /*kotlin.Array<out kotlin.String>*/): X1
+public fun overloadedFun5(/*0*/ s: kotlin.String, /*1*/ vararg ss: kotlin.String /*kotlin.Array<out kotlin.String>*/): X2
+
+public object X1 {
+    private constructor X1()
+    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 object X2 {
+    private constructor X2()
+    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
+}