FIR resolve: add partial support of extension lambda calls

Here we introduce ONLY_IMPLICIT_RECEIVER tower level
to support extension lambda calls on local variables,
and soften extension receiver checks to make such extensions visible & applicable.
Also here we try to map arguments twice for functional types

compiler/testData/diagnostics/tests/Builders.fir.kt

@@ -70,7 +70,7 @@ abstract class Tag(val name : String) : Element() {
   val attributes = HashMap<String, String>()
 
   protected fun <T : Element> initTag(tag : T, init : T.() -> Unit) : T {
-    tag.<!UNRESOLVED_REFERENCE!>init<!>()
+    tag.init()
     children.add(tag)
     return tag
   }
@@ -143,7 +143,7 @@ class A() : BodyTag("a") {
 
 fun html(init : HTML.() -> Unit) : HTML {
   val html = HTML()
-  html.<!UNRESOLVED_REFERENCE!>init<!>()
+  html.init()
   return html
 }
 

compiler/testData/diagnostics/tests/ExtensionCallInvoke.fir.kt

@@ -1,7 +1,7 @@
 fun bar(doIt: Int.() -> Int) {
-    1.<!UNRESOLVED_REFERENCE!>doIt<!>()
-    1?.<!UNRESOLVED_REFERENCE!>doIt<!>()
+    1.doIt()
+    1?.doIt()
     val i: Int? = 1
     i.<!UNRESOLVED_REFERENCE!>doIt<!>()
-    i?.<!UNRESOLVED_REFERENCE!>doIt<!>()
+    i?.doIt()
 }

compiler/testData/diagnostics/tests/FreeFunctionCalledAsExtension.fir.kt

@@ -9,5 +9,5 @@ interface A : (String) -> Unit {}
 fun foo(a: @ExtensionFunctionType A) {
     // @Extension annotation on an unrelated type shouldn't have any effect on this diagnostic.
     // Only kotlin.Function{n} type annotated with @Extension should
-    "".<!UNRESOLVED_REFERENCE!>a<!>()
+    "".a()
 }

compiler/testData/diagnostics/tests/FunctionCalleeExpressions.fir.kt

@@ -26,7 +26,7 @@ fun <T> fooT2() : (t : T) -> T {
 fun main(args : Array<String>) {
     args.foo()()
     <!INAPPLICABLE_CANDIDATE!>args.foo1()()<!>
-    <!INAPPLICABLE_CANDIDATE!><!UNRESOLVED_REFERENCE!>a<!>.foo1()()<!>
+    <!UNRESOLVED_REFERENCE!>a<!>.foo1()()
     <!UNRESOLVED_REFERENCE!>a<!>.foo1()(<!UNRESOLVED_REFERENCE!>a<!>)
 
     args.foo1()(1)

compiler/testData/diagnostics/tests/callableReference/resolve/kt10036.fir.kt

@@ -9,7 +9,7 @@ class OverloadTest {
 object Literal
 
 inline fun <T : Any> OverloadTest.overload(value: T?, function: OverloadTest.(T) -> Unit) {
-    if (value == null) foo(Literal) else <!INAPPLICABLE_CANDIDATE!>function<!>(value)
+    if (value == null) foo(Literal) else function(value)
 }
 
 // Overload resolution ambiguity

compiler/testData/diagnostics/tests/deprecated/typeUsage.fir.kt

@@ -29,7 +29,7 @@ class Properties {
 
 fun param(param: Obsolete) { param.use() }
 
-fun funcParamReceiver(param: Obsolete.()->Unit) { Obsolete().<!UNRESOLVED_REFERENCE!>param<!>() }
+fun funcParamReceiver(param: Obsolete.()->Unit) { Obsolete().param() }
 fun funcParamParam(param: (Obsolete)->Unit) { param(Obsolete()) }
 fun funcParamRetVal(param: ()->Obsolete) { param() }
 

compiler/testData/diagnostics/tests/enum/dontCreatePackageTypeForEnumEntry_after.fir.kt

@@ -9,8 +9,8 @@ enum class E {
 
 val foo: Any.() -> Unit = {}
 
-fun f1() = E.FIRST.<!UNRESOLVED_REFERENCE!>foo<!>()
-fun f2() = E.FIRST.(<!UNRESOLVED_REFERENCE!>foo<!>)()
-fun f3() = E.SECOND.<!UNRESOLVED_REFERENCE!>foo<!>()
-fun f4() = E.SECOND.(<!UNRESOLVED_REFERENCE!>foo<!>)()
+fun f1() = E.FIRST.foo()
+fun f2() = E.FIRST.(foo)()
+fun f3() = E.SECOND.foo()
+fun f4() = E.SECOND.(foo)()
 fun f5() = E.SECOND.A()

compiler/testData/diagnostics/tests/enum/dontCreatePackageTypeForEnumEntry_before.fir.kt

@@ -9,8 +9,8 @@ enum class E {
 
 val foo: Any.() -> Unit = {}
 
-fun f1() = E.FIRST.<!UNRESOLVED_REFERENCE!>foo<!>()
-fun f2() = E.FIRST.(<!UNRESOLVED_REFERENCE!>foo<!>)()
-fun f3() = E.SECOND.<!UNRESOLVED_REFERENCE!>foo<!>()
-fun f4() = E.SECOND.(<!UNRESOLVED_REFERENCE!>foo<!>)()
+fun f1() = E.FIRST.foo()
+fun f2() = E.FIRST.(foo)()
+fun f3() = E.SECOND.foo()
+fun f4() = E.SECOND.(foo)()
 fun f5() = E.SECOND.A()

compiler/testData/diagnostics/tests/extensions/kt1875.fir.kt

@@ -3,7 +3,7 @@
 
 package kt1875
 
-fun foo(a : Int?, b : Int.(Int)->Int) = a?.<!UNRESOLVED_REFERENCE!>b<!>(1) //unnecessary safe call warning
+fun foo(a : Int?, b : Int.(Int)->Int) = a?.b(1) //unnecessary safe call warning
 
 interface T {
     val f : ((i: Int) -> Unit)?

compiler/testData/diagnostics/tests/extensions/variableInvoke.fir.kt

@@ -1,11 +1,11 @@
 class A(foo: Int.() -> Unit) {
     init {
-        4.<!UNRESOLVED_REFERENCE!>foo<!>()
+        4.foo()
     }
 }
 
 fun test(foo: Int.(String) -> Unit) {
-    4.<!UNRESOLVED_REFERENCE!>foo<!>("")
-    4.<!UNRESOLVED_REFERENCE!>foo<!>(p1 = "")
-    4.<!UNRESOLVED_REFERENCE!>foo<!>(p2 = "")
+    4.foo("")
+    4.<!INAPPLICABLE_CANDIDATE!>foo<!>(p1 = "")
+    4.foo(p2 = "")
 }

compiler/testData/diagnostics/tests/inference/kt3184.fir.kt

@@ -4,7 +4,7 @@ package a
 import java.util.HashMap
 
 private fun <T> test(value: T, extf: String.(value: T)->Unit) {
-    "".<!UNRESOLVED_REFERENCE!>extf<!>(value)
+    "".extf(value)
 }
 
 fun main() {

compiler/testData/diagnostics/tests/inference/regressions/kt2514.fir.kt

@@ -4,7 +4,7 @@ package kt2514
 //+JDK
 import java.io.Closeable
 
-fun <T> Thread.use(block: Thread.() -> T): T = <!INAPPLICABLE_CANDIDATE!>block<!>()
+fun <T> Thread.use(block: Thread.() -> T): T = block()
 
 fun <T: Closeable, R> T.use(block: (T)-> R) : R = block(this)
 

compiler/testData/diagnostics/tests/inference/regressions/kt2841_it_this.fir.kt

@@ -7,7 +7,7 @@ interface Closeable {
 class C : Closeable
 
 public inline fun <T: Closeable, R> use(t: T, block: T.(T)-> R) : R {
-    return t.<!UNRESOLVED_REFERENCE!>block<!>(t)
+    return t.block(t)
 }
 
 fun test() {

compiler/testData/diagnostics/tests/inference/regressions/kt2841_this.fir.kt

@@ -7,7 +7,7 @@ interface Closeable {
 class C : Closeable
 
 public inline fun <T: Closeable, R> T.use(block: T.()-> R) : R {
-    return this.<!UNRESOLVED_REFERENCE!>block<!>()
+    return this.block()
 }
 
 fun test() {

compiler/testData/diagnostics/tests/inference/reportingImprovements/wrongArgumentPassedToLocalExtensionFunction.fir.kt

@@ -15,7 +15,7 @@ fun Int.test(f: String.(Int) -> Unit) {
     f("", 0)
     <!INAPPLICABLE_CANDIDATE!>f<!>("")
     with("") {
-        <!INAPPLICABLE_CANDIDATE!>f<!>(0)
+        f(0)
         <!INAPPLICABLE_CANDIDATE!>f<!>(0.0)
     }
 }

compiler/testData/diagnostics/tests/inline/invoke.fir.kt

@@ -5,8 +5,8 @@ inline fun inlineFunWithInvoke(s: (p: Int) -> Unit, ext: Int.(p: Int) -> Unit) {
     s.invoke(11)
     s invoke 11
 
-    11.<!UNRESOLVED_REFERENCE!>ext<!>(11)
-    11 <!UNRESOLVED_REFERENCE!>ext<!> 11
+    11.ext(11)
+    11 ext 11
 }
 
 inline fun inlineFunWithInvokeNonInline(noinline s: (p: Int) -> Unit, ext: Int.(p: Int) -> Unit) {
@@ -14,8 +14,8 @@ inline fun inlineFunWithInvokeNonInline(noinline s: (p: Int) -> Unit, ext: Int.(
     s.invoke(11)
     s invoke 11
 
-    11.<!UNRESOLVED_REFERENCE!>ext<!>(11)
-    11 <!UNRESOLVED_REFERENCE!>ext<!> 11
+    11.ext(11)
+    11 ext 11
 }
 
 inline fun Function1<Int, Unit>.inlineExt() {

compiler/testData/diagnostics/tests/inline/propagation.fir.kt

@@ -6,8 +6,8 @@ inline fun inlineFunWithInvoke(s: (p: Int) -> Unit, ext: Int.(p: Int) -> Unit) {
 }
 
 inline fun inlineFunWithInvokeClosure(s: (p: Int) -> Unit, ext: Int.(p: Int) -> Unit) {
-    subInline({p: Int -> s(p)}, { p -> this.<!UNRESOLVED_REFERENCE!>ext<!>(p)})
-    subNoInline({p: Int -> s(p)}, { p -> this.<!UNRESOLVED_REFERENCE!>ext<!>(p)})
+    subInline({p: Int -> s(p)}, { p -> this.ext(p)})
+    subNoInline({p: Int -> s(p)}, { p -> this.ext(p)})
 }
 
 //No inline
@@ -17,8 +17,8 @@ inline fun inlineFunWithInvokeNonInline(noinline s: (p: Int) -> Unit, noinline e
 }
 
 inline fun inlineFunWithInvokeClosureNoinline(noinline s: (p: Int) -> Unit, noinline ext: Int.(p: Int) -> Unit) {
-    subInline({p: Int -> s(p)}, { p -> this.<!UNRESOLVED_REFERENCE!>ext<!>(p)})
-    subNoInline({p: Int -> s(p)}, { p -> this.<!UNRESOLVED_REFERENCE!>ext<!>(p)})
+    subInline({p: Int -> s(p)}, { p -> this.ext(p)})
+    subNoInline({p: Int -> s(p)}, { p -> this.ext(p)})
 }
 
 //ext function
@@ -28,8 +28,8 @@ inline fun Function1<Int, Unit>.inlineExt(ext: Int.(p: Int) -> Unit) {
 }
 
 inline fun Function1<Int, Unit>.inlineExtWithClosure(ext: Int.(p: Int) -> Unit) {
-    subInline({p: Int -> this(p)}, { p -> this.<!UNRESOLVED_REFERENCE!>ext<!>(p)})
-    subNoInline({p: Int -> this(p)}, { p -> this.<!UNRESOLVED_REFERENCE!>ext<!>(p)})
+    subInline({p: Int -> this(p)}, { p -> this.ext(p)})
+    subNoInline({p: Int -> this(p)}, { p -> this.ext(p)})
 }
 
 inline fun subInline(s: (p: Int) -> Unit, ext: Int.(p: Int) -> Unit) {}

compiler/testData/diagnostics/tests/inline/property/invoke.fir.kt

@@ -13,8 +13,8 @@ inline var value: (p: Int) -> String
 inline var value2: Int.(p: Int) -> String
     get() = {"123" }
     set(ext: Int.(p: Int) -> String) {
-        11.<!UNRESOLVED_REFERENCE!>ext<!>(11)
-        11.<!UNRESOLVED_REFERENCE!>ext<!>(11)
+        11.ext(11)
+        11.ext(11)
 
         val p = ext
     }

compiler/testData/diagnostics/tests/inline/sam.fir.kt

@@ -19,8 +19,8 @@ inline fun inlineFunWithInvoke(s: (p: Int) -> Unit, ext: Int.(p: Int) -> Unit) {
         s.invoke(11)
         s invoke 11
 
-        11.<!UNRESOLVED_REFERENCE!>ext<!>(11)
-        11 <!UNRESOLVED_REFERENCE!>ext<!> 11
+        11.ext(11)
+        11 ext 11
 
         s
         ext
@@ -34,8 +34,8 @@ inline fun inlineFunWithInvokeNonInline(noinline s: (p: Int) -> Unit, ext: Int.(
         s.invoke(11)
         s invoke 11
 
-        11.<!UNRESOLVED_REFERENCE!>ext<!>(11)
-        11 <!UNRESOLVED_REFERENCE!>ext<!> 11
+        11.ext(11)
+        11 ext 11
 
         s
         ext

compiler/testData/diagnostics/tests/labels/kt4586.fir.kt

@@ -3,7 +3,7 @@
 
 fun string(init: StringBuilder.() -> Unit): String{
     val answer = StringBuilder()
-    answer.<!UNRESOLVED_REFERENCE!>init<!>()
+    answer.init()
     return answer.toString()
 }
 

compiler/testData/diagnostics/tests/labels/labelReferencesInsideObjectExpressions.fir.kt

@@ -16,7 +16,7 @@ fun B.b() {
 
 
 fun test() {
-    fun <T> without(f: T.() -> Unit): Unit = (null!!).<!UNRESOLVED_REFERENCE!>f<!>()
+    fun <T> without(f: T.() -> Unit): Unit = (null!!).f()
     without<B>() b@ {
         object : A {
             override fun foo() {

compiler/testData/diagnostics/tests/operatorsOverloading/kt13330.fir.kt

@@ -1,4 +1,4 @@
 // !WITH_NEW_INFERENCE
 //KT-13330 AssertionError: Illegal resolved call to variable with invoke
 
-fun foo(exec: (String.() -> Unit)?) = "".<!UNRESOLVED_REFERENCE!>exec<!><caret>() // <caret> is test data tag here
+fun foo(exec: (String.() -> Unit)?) = "".<!INAPPLICABLE_CANDIDATE!>exec<!><caret>() // <caret> is test data tag here

compiler/testData/diagnostics/tests/override/parameterNames/invokeInFunctionClass.fir.kt

@@ -21,7 +21,7 @@ fun test2(f: (String) -> Unit) {
 }
 
 fun test3(f: String.(String) -> Unit) {
-    "".<!UNRESOLVED_REFERENCE!>f<!>("")
-    "".<!UNRESOLVED_REFERENCE!>f<!>(p0 = "")
-    "".<!UNRESOLVED_REFERENCE!>f<!>(zzz = "")
+    "".f("")
+    "".<!INAPPLICABLE_CANDIDATE!>f<!>(p0 = "")
+    "".<!INAPPLICABLE_CANDIDATE!>f<!>(zzz = "")
 }

compiler/testData/diagnostics/tests/regressions/Jet121.fir.kt

@@ -10,5 +10,5 @@ return if (answer == 2) "OK" else "FAIL"
 }
 
 fun apply(arg:String, f :  String.() -> Int) : Int {
-  return arg.<!UNRESOLVED_REFERENCE!>f<!>()
+  return arg.f()
 }

compiler/testData/diagnostics/tests/regressions/kt3731.fir.kt

@@ -2,15 +2,15 @@
 
 class A {
     fun foo() {}
-    fun bar(f: A.() -> Unit = {}) = <!INAPPLICABLE_CANDIDATE!>f<!>()
+    fun bar(f: A.() -> Unit = {}) = f()
 }
 
 class B {
     class D {
         init {
             A().bar {
-                this.<!UNRESOLVED_REFERENCE!>foo<!>()
-                <!UNRESOLVED_REFERENCE!>foo<!>()
+                this.foo()
+                foo()
             }
         }
     }

compiler/testData/diagnostics/tests/regressions/kt442.fir.kt

@@ -21,7 +21,7 @@ fun <T> generic_invoker(gen :  (String) -> T) : T {
 }
 
 infix fun <T> T.with(f :  T.() -> Unit) {
-    <!INAPPLICABLE_CANDIDATE!>f<!>()
+    f()
 }
 
 fun main() {

compiler/testData/diagnostics/tests/regressions/kt604.fir.kt

@@ -14,7 +14,7 @@ interface ChannelPipelineFactory{
 class StandardPipelineFactory(val config:  ChannelPipeline.()->Unit) : ChannelPipelineFactory {
     override fun getPipeline() : ChannelPipeline {
         val pipeline = DefaultChannelPipeline()
-        pipeline.<!UNRESOLVED_REFERENCE!>config<!> ()
+        pipeline.config ()
         return pipeline
     }
 }

compiler/testData/diagnostics/tests/regressions/kt9808.fir.kt

@@ -4,5 +4,5 @@ object O
 val foo: O.() -> Unit  = null!!
 
 fun test() {
-    O.<!UNRESOLVED_REFERENCE!>foo<!>()
+    O.foo()
 }

compiler/testData/diagnostics/tests/regressions/propertyWithExtensionTypeInvoke.fir.kt

@@ -2,6 +2,6 @@ object X
 
 class Y {
     fun f(op: X.() -> Unit) {
-        X.<!UNRESOLVED_REFERENCE!>op<!>()
+        X.op()
     }
 }

compiler/testData/diagnostics/tests/resolve/ambiguityWithTwoCorrespondingFunctionTypes.fir.kt

@@ -2,7 +2,7 @@
 
 fun foo(a: Any, f: ()->Int) = f()
 fun foo(a: Any, f: (Any)->Int) = f(a)
-fun foo(i: Int, f: Int.()->Int) = i.<!UNRESOLVED_REFERENCE!>f<!>()
+fun foo(i: Int, f: Int.()->Int) = i.f()
 
 fun test1() {
     <!AMBIGUITY!>foo<!>(1) { ->

compiler/testData/diagnostics/tests/resolve/dslMarker/dslMarkerOnTypealias.fir.kt

@@ -12,17 +12,17 @@ typealias XBar = Bar
 
 typealias XXBar = XBar
 
-fun Foo.foo(body: Foo.() -> Unit) = <!INAPPLICABLE_CANDIDATE!>body<!>()
-fun Foo.xbar(body: XBar.() -> Unit) = Bar().<!UNRESOLVED_REFERENCE!>body<!>()
-fun Foo.xxbar(body: XXBar.() -> Unit) = Bar().<!UNRESOLVED_REFERENCE!>body<!>()
+fun Foo.foo(body: Foo.() -> Unit) = body()
+fun Foo.xbar(body: XBar.() -> Unit) = Bar().body()
+fun Foo.xxbar(body: XXBar.() -> Unit) = Bar().body()
 
 fun test() {
     Foo().foo {
-        <!UNRESOLVED_REFERENCE!>xbar<!> {
-            <!UNRESOLVED_REFERENCE!>foo<!> {}
+        xbar {
+            foo {}
         }
-        <!UNRESOLVED_REFERENCE!>xxbar<!> {
-            <!UNRESOLVED_REFERENCE!>foo<!> {}
+        xxbar {
+            foo {}
         }
     }
 }

compiler/testData/diagnostics/tests/resolve/dslMarker/dslMarkerWithTypealiasRecursion.fir.kt

@@ -12,13 +12,13 @@ class Bar
 typealias YBar = ZBar
 typealias ZBar = <!OTHER_ERROR!>YBar<!>
 
-fun Foo.foo(body: Foo.() -> Unit) = <!INAPPLICABLE_CANDIDATE!>body<!>()
-fun Foo.zbar(body: ZBar.() -> Unit) = Bar().<!UNRESOLVED_REFERENCE!>body<!>()
+fun Foo.foo(body: Foo.() -> Unit) = body()
+fun Foo.zbar(body: ZBar.() -> Unit) = Bar().body()
 
 fun test() {
     Foo().foo {
-        <!UNRESOLVED_REFERENCE!>zbar<!> {
-            <!UNRESOLVED_REFERENCE!>foo<!> {}
+        zbar {
+            foo {}
         }
     }
 }

compiler/testData/diagnostics/tests/resolve/implicitReceiverProperty.fir.kt

@@ -20,14 +20,14 @@ package test
 
 import a.A
 
-fun <T, R> T.with(f: T.() -> R) = <!INAPPLICABLE_CANDIDATE!>f<!>()
+fun <T, R> T.with(f: T.() -> R) = f()
 
 fun A.extFun1() = b.length
 
 // fun A.extFun2() = c.length // TODO fix KT-9953
 
-val x1 = A("").with { b.<!UNRESOLVED_REFERENCE!>length<!> }
+val x1 = A("").with { b.length }
 
 // val x2 = A("").with { c.length } // TODO fix KT-9953
 
-val x3 = A.with { c.<!UNRESOLVED_REFERENCE!>length<!> }
+val x3 = A.with { c.length }

compiler/testData/diagnostics/tests/resolve/invoke/implicitInvoke.fir.kt

@@ -24,10 +24,10 @@ fun test(c: () -> String, e: Int.() -> String) {
     c()
     (c)()
 
-    3.<!UNRESOLVED_REFERENCE!>e<!>()
-    3.(<!UNRESOLVED_REFERENCE!>e<!>)()
+    3.e()
+    3.(e)()
     with(3) {
-        <!INAPPLICABLE_CANDIDATE!>e<!>()
-        (<!INAPPLICABLE_CANDIDATE!>e<!>)()
+        e()
+        (e)()
     }
 }

compiler/testData/diagnostics/tests/resolve/invoke/invokeAndSmartCast.fir.kt

@@ -15,8 +15,8 @@ fun test(a: A) {
         a.<!INAPPLICABLE_CANDIDATE!>x<!>()
         <!INAPPLICABLE_CANDIDATE!>(a.x)()<!>
         if (a.x != null) {
-            a.<!INAPPLICABLE_CANDIDATE!>x<!>() // todo
-            <!INAPPLICABLE_CANDIDATE!>(a.x)()<!>
+            a.x() // todo
+            (a.x)()
         }
     }
 }

compiler/testData/diagnostics/tests/resolve/invoke/invokeAsMemberExtensionToExplicitReceiver.fir.kt

@@ -8,5 +8,5 @@ fun test(a: A, foo: Foo) {
 }
 
 fun test(a: Int, foo: Int.()->Unit) {
-    a.<!UNRESOLVED_REFERENCE!>foo<!>()
+    a.foo()
 }

compiler/testData/diagnostics/tests/resolve/invoke/invokeOnVariableWithExtensionFunctionType.fir.kt

@@ -55,21 +55,21 @@ fun test(a: A, b: B) {
     a.foo(b)
 
     with(a) {
-        b.<!UNRESOLVED_REFERENCE!>foo<!>()
+        b.foo()
 
-        b.(<!UNRESOLVED_REFERENCE!>foo<!>)()
+        b.(foo)()
 
-        <!UNRESOLVED_REFERENCE!>(b.<!UNRESOLVED_REFERENCE!>foo<!>)()<!>
+        (b.foo)()
 
         foo(b)
         (foo)(b)
     }
 
     with(b) {
-        a.<!INAPPLICABLE_CANDIDATE!>foo<!>()
-        a.(<!INAPPLICABLE_CANDIDATE!>foo<!>)()
+        a.foo()
+        a.(foo)()
 
-        <!INAPPLICABLE_CANDIDATE!>(a.foo)()<!>
+        (a.foo)()
 
         (a.foo)(this)
         a.foo(this)
@@ -77,8 +77,8 @@ fun test(a: A, b: B) {
 
     with(a) {
         with(b) {
-            <!INAPPLICABLE_CANDIDATE!>foo<!>()
-            (<!INAPPLICABLE_CANDIDATE!>foo<!>)()
+            foo()
+            (foo)()
         }
     }
 }

compiler/testData/diagnostics/tests/resolve/invoke/kt9805.fir.kt

@@ -6,11 +6,11 @@ class B
 
 fun test(a: A, b: B) {
     with(b) {
-        a.<!INAPPLICABLE_CANDIDATE!>foo<!>() // here must be error, because a is not extension receiver
+        a.foo() // here must be error, because a is not extension receiver
 
         a.foo(this)
 
-        <!INAPPLICABLE_CANDIDATE!>(a.foo)()<!>
+        (a.foo)()
 
         (a.foo)(this)
     }

compiler/testData/diagnostics/tests/resolve/invoke/valNamedInvoke.fir.kt

@@ -1,9 +1,9 @@
 interface A
 
 fun foo(invoke: A.()->Unit, a: A) {
-    a.<!UNRESOLVED_REFERENCE!>invoke<!>()
+    a.invoke()
 }
 
 fun bar(invoke: Any.()->Any, a: Any) {
-    a.<!UNRESOLVED_REFERENCE!>invoke<!>()
+    a.invoke()
 }

compiler/testData/diagnostics/tests/resolve/invoke/wrongInvokeExtension.fir.kt

@@ -12,7 +12,7 @@ fun test(a: A, b: B) {
     b.(a)()
 
     with(b) {
-        val y: Int = <!UNRESOLVED_REFERENCE!>a<!>()
-        (<!UNRESOLVED_REFERENCE!>a<!>)()
+        val y: Int = a()
+        (a)()
     }
 }

compiler/testData/diagnostics/tests/resolve/priority/invokeExtensionVsOther.fir.kt

@@ -9,7 +9,7 @@ class B {
 
 fun test(foo: A.() -> Int) {
     with(A()) {
-        <!INAPPLICABLE_CANDIDATE!>foo<!>() <!INAPPLICABLE_CANDIDATE!>checkType<!> { <!INAPPLICABLE_CANDIDATE!>_<!><Int>() }
+        foo() checkType { _<Int>() }
         with(B()) {
             foo() checkType { _<B>() }
             this.foo() checkType { _<B>() }

compiler/testData/diagnostics/tests/safeCall.fir.kt

@@ -1,7 +1,7 @@
 // !WITH_NEW_INFERENCE
 
 fun f(s: String, action: (String.() -> Unit)?) {
-    s.foo().bar().<!UNRESOLVED_REFERENCE!>action<!>()
+    s.foo().bar().<!INAPPLICABLE_CANDIDATE!>action<!>()
 }
 
 fun String.foo() = ""

compiler/testData/ir/irText/expressions/extFunInvokeAsFun.fir.txt

@@ -7,9 +7,10 @@ FILE fqName:<root> fileName:/extFunInvokeAsFun.kt
         CALL 'public abstract fun invoke (p1: kotlin.Any?): kotlin.Unit [operator] declared in kotlin.Function1' type=kotlin.Unit origin=null
           $this: GET_VAR 'block: kotlin.Function1<kotlin.Any?, kotlin.Unit> declared in <root>.with1' type=kotlin.Function1<kotlin.Any?, kotlin.Unit> origin=null
           p1: GET_VAR 'receiver: kotlin.Any? declared in <root>.with1' type=kotlin.Any? origin=null
-  FUN name:with2 visibility:public modality:FINAL <> (receiver:kotlin.Any?, block:kotlin.Function1<kotlin.Any?, kotlin.Unit>) returnType:IrErrorType
+  FUN name:with2 visibility:public modality:FINAL <> (receiver:kotlin.Any?, block:kotlin.Function1<kotlin.Any?, kotlin.Unit>) returnType:kotlin.Unit
     VALUE_PARAMETER name:receiver index:0 type:kotlin.Any?
     VALUE_PARAMETER name:block index:1 type:kotlin.Function1<kotlin.Any?, kotlin.Unit>
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun with2 (receiver: kotlin.Any?, block: kotlin.Function1<kotlin.Any?, kotlin.Unit>): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Unresolved name: block>#' type=IrErrorType
+      RETURN type=kotlin.Nothing from='public final fun with2 (receiver: kotlin.Any?, block: kotlin.Function1<kotlin.Any?, kotlin.Unit>): kotlin.Unit declared in <root>'
+        CALL 'public abstract fun invoke (p1: kotlin.Any?): kotlin.Unit [operator] declared in kotlin.Function1' type=kotlin.Unit origin=null
+          $this: GET_VAR 'block: kotlin.Function1<kotlin.Any?, kotlin.Unit> declared in <root>.with2' type=kotlin.Function1<kotlin.Any?, kotlin.Unit> origin=null

compiler/testData/ir/irText/expressions/extFunSafeInvoke.fir.txt

@@ -1,9 +1,10 @@
 FILE fqName:<root> fileName:/extFunSafeInvoke.kt
-  FUN name:test visibility:public modality:FINAL <> (receiver:kotlin.Any?, fn:kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit>) returnType:IrErrorType
+  FUN name:test visibility:public modality:FINAL <> (receiver:kotlin.Any?, fn:kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit>) returnType:kotlin.Unit?
     VALUE_PARAMETER name:receiver index:0 type:kotlin.Any?
     VALUE_PARAMETER name:fn index:1 type:kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit>
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test (receiver: kotlin.Any?, fn: kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit>): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Unresolved name: fn>#' type=IrErrorType
-          CONST Int type=kotlin.Int value=42
-          CONST String type=kotlin.String value="Hello"
+      RETURN type=kotlin.Nothing from='public final fun test (receiver: kotlin.Any?, fn: kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit>): kotlin.Unit? declared in <root>'
+        CALL 'public abstract fun invoke (p1: kotlin.Any, p2: kotlin.Int, p3: kotlin.String): kotlin.Unit [operator] declared in kotlin.Function3' type=kotlin.Unit? origin=null
+          $this: GET_VAR 'fn: kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit> declared in <root>.test' type=kotlin.Function3<kotlin.Any, kotlin.Int, kotlin.String, kotlin.Unit> origin=null
+          p1: CONST Int type=kotlin.Int value=42
+          p2: CONST String type=kotlin.String value="Hello"

compiler/testData/ir/irText/expressions/variableAsFunctionCall.fir.txt

@@ -13,11 +13,12 @@ FILE fqName:<root> fileName:/variableAsFunctionCall.kt
       RETURN type=kotlin.Nothing from='public final fun test1 (f: kotlin.Function0<kotlin.Unit>): kotlin.Unit declared in <root>'
         CALL 'public abstract fun invoke (): kotlin.Unit [operator] declared in kotlin.Function0' type=kotlin.Unit origin=null
           $this: GET_VAR 'f: kotlin.Function0<kotlin.Unit> declared in <root>.test1' type=kotlin.Function0<kotlin.Unit> origin=null
-  FUN name:test2 visibility:public modality:FINAL <> (f:kotlin.Function1<kotlin.String, kotlin.Unit>) returnType:IrErrorType
+  FUN name:test2 visibility:public modality:FINAL <> (f:kotlin.Function1<kotlin.String, kotlin.Unit>) returnType:kotlin.Unit
     VALUE_PARAMETER name:f index:0 type:kotlin.Function1<kotlin.String, kotlin.Unit>
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test2 (f: kotlin.Function1<kotlin.String, kotlin.Unit>): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Unresolved name: f>#' type=IrErrorType
+      RETURN type=kotlin.Nothing from='public final fun test2 (f: kotlin.Function1<kotlin.String, kotlin.Unit>): kotlin.Unit declared in <root>'
+        CALL 'public abstract fun invoke (p1: kotlin.String): kotlin.Unit [operator] declared in kotlin.Function1' type=kotlin.Unit origin=null
+          $this: GET_VAR 'f: kotlin.Function1<kotlin.String, kotlin.Unit> declared in <root>.test2' type=kotlin.Function1<kotlin.String, kotlin.Unit> origin=null
   FUN name:test3 visibility:public modality:FINAL <> () returnType:kotlin.String
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun test3 (): kotlin.String declared in <root>'