FIR: Support coercion-to-unit semantics for callable references

compiler/testData/codegen/box/callableReference/adaptedReferences/noAdaptedReferencesIfNoOptimizedReferencesEnabled.kt

@@ -1,5 +1,4 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // KOTLIN_CONFIGURATION_FLAGS: +JVM.NO_OPTIMIZED_CALLABLE_REFERENCES
 

compiler/testData/codegen/box/callableReference/adaptedReferences/noNameClashForReferencesToSameFunction.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
-
 var result = ""
 
 class C(val token: String) {

compiler/testData/codegen/box/callableReference/bound/coercionToUnit.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // KJS_WITH_FULL_RUNTIME
 // !LANGUAGE: +NewInference
 // WITH_RUNTIME

compiler/testData/codegen/box/callableReference/function/coercionToUnit.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +NewInference
-// IGNORE_BACKEND_FIR: JVM_IR
 
 fun foo(s: String): Boolean {
     if (s != "kotlin") throw AssertionError(s)

compiler/testData/diagnostics/tests/callableReference/function/ambiguityTopLevelVsTopLevel.fir.kt

@@ -5,5 +5,5 @@ fun foo(x: Any, y: Int) = y
 fun main() {
     <!UNRESOLVED_REFERENCE!>::foo<!>
     
-    val fooRef: (Int, Any) -> Unit = <!UNRESOLVED_REFERENCE!>::foo<!>
+    val fooRef: (Int, Any) -> Unit = ::foo
 }

compiler/testData/diagnostics/tests/suspendConversion/suspendConversionWithFunInterfaces.fir.kt

@@ -17,5 +17,5 @@ fun test() {
     <!INAPPLICABLE_CANDIDATE!>foo1<!>(::bar1)
     <!INAPPLICABLE_CANDIDATE!>foo1<!>(::bar2)
 
-    <!INAPPLICABLE_CANDIDATE!>foo1<!>(<!UNRESOLVED_REFERENCE!>::bar3<!>) // Should be ambiguity
+    foo1(::bar3) // Should be ambiguity
 }

compiler/testData/ir/irText/expressions/callableReferences/adaptedWithCoercionToUnit.fir.txt

@@ -19,16 +19,16 @@ FILE fqName:<root> fileName:/adaptedWithCoercionToUnit.kt
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun fnv (vararg xs: kotlin.Int): kotlin.Int declared in <root>'
         CONST Int type=kotlin.Int value=1
-  FUN name:test0 visibility:public modality:FINAL <> () returnType:IrErrorType
+  FUN name:test0 visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test0 (): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/useUnit0]>#' type=IrErrorType
-          FUNCTION_REFERENCE 'public final fun fn0 (): kotlin.Int declared in <root>' type=kotlin.reflect.KFunction0<kotlin.Int> origin=null reflectionTarget=<same>
-  FUN name:test1 visibility:public modality:FINAL <> () returnType:IrErrorType
+      RETURN type=kotlin.Nothing from='public final fun test0 (): kotlin.Unit declared in <root>'
+        CALL 'public final fun useUnit0 (fn: kotlin.Function0<kotlin.Unit>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+          fn: FUNCTION_REFERENCE 'public final fun fn0 (): kotlin.Int declared in <root>' type=kotlin.reflect.KFunction0<kotlin.Unit> origin=null reflectionTarget=<same>
+  FUN name:test1 visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test1 (): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/useUnit1]>#' type=IrErrorType
-          FUNCTION_REFERENCE 'public final fun fn1 (x: kotlin.Int): kotlin.Int declared in <root>' type=kotlin.reflect.KFunction1<kotlin.Int, kotlin.Int> origin=null reflectionTarget=<same>
+      RETURN type=kotlin.Nothing from='public final fun test1 (): kotlin.Unit declared in <root>'
+        CALL 'public final fun useUnit1 (fn: kotlin.Function1<kotlin.Int, kotlin.Unit>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+          fn: FUNCTION_REFERENCE 'public final fun fn1 (x: kotlin.Int): kotlin.Int declared in <root>' type=kotlin.reflect.KFunction1<kotlin.Int, kotlin.Unit> origin=null reflectionTarget=<same>
   FUN name:testV0 visibility:public modality:FINAL <> () returnType:IrErrorType
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun testV0 (): IrErrorType declared in <root>'

compiler/testData/ir/irText/expressions/callableReferences/withAdaptedArguments.fir.txt

@@ -73,11 +73,11 @@ FILE fqName:<root> fileName:/withAdaptedArguments.kt
       RETURN type=kotlin.Nothing from='public final fun testVararg (): IrErrorType declared in <root>'
         ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/use]>#' type=IrErrorType
           FUNCTION_REFERENCE 'public final fun fnWithVarargs (vararg xs: kotlin.Int): kotlin.String declared in <root>' type=kotlin.reflect.KFunction1<kotlin.IntArray, kotlin.String> origin=null reflectionTarget=<same>
-  FUN name:testCoercionToUnit visibility:public modality:FINAL <> () returnType:IrErrorType
+  FUN name:testCoercionToUnit visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun testCoercionToUnit (): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/coerceToUnit]>#' type=IrErrorType
-          FUNCTION_REFERENCE 'public final fun fnWithDefault (a: kotlin.Int, b: kotlin.Int): kotlin.String declared in <root>' type=kotlin.reflect.KFunction1<kotlin.Int, kotlin.String> origin=null reflectionTarget=<same>
+      RETURN type=kotlin.Nothing from='public final fun testCoercionToUnit (): kotlin.Unit declared in <root>'
+        CALL 'public final fun coerceToUnit (fn: kotlin.Function1<kotlin.Int, kotlin.Unit>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+          fn: FUNCTION_REFERENCE 'public final fun fnWithDefault (a: kotlin.Int, b: kotlin.Int): kotlin.String declared in <root>' type=kotlin.reflect.KFunction1<kotlin.Int, kotlin.Unit> origin=null reflectionTarget=<same>
   FUN name:testImportedObjectMember visibility:public modality:FINAL <> () returnType:IrErrorType
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun testImportedObjectMember (): IrErrorType declared in <root>'