IR: add IrSimpleFunction.isInfix

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt

@@ -396,7 +396,8 @@ class Fir2IrDeclarationStorage(
                     isSuspend = isSuspend,
                     isExpect = simpleFunction?.isExpect == true,
                     isFakeOverride = updatedOrigin == IrDeclarationOrigin.FAKE_OVERRIDE,
-                    isOperator = simpleFunction?.isOperator == true
+                    isOperator = simpleFunction?.isOperator == true,
+                    isInfix = simpleFunction?.isInfix == true
                 ).apply {
                     metadata = FirMetadataSource.Function(function)
                     convertAnnotationsFromLibrary(function)
@@ -520,7 +521,7 @@ class Fir2IrDeclarationStorage(
                 isExternal = propertyAccessor?.isExternal == true,
                 isTailrec = false, isSuspend = false, isExpect = false,
                 isFakeOverride = origin == IrDeclarationOrigin.FAKE_OVERRIDE,
-                isOperator = false
+                isOperator = false, isInfix = false
             ).apply {
                 correspondingPropertySymbol = correspondingProperty.symbol
                 if (propertyAccessor != null) {

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DataClassMembersGenerator.kt

@@ -260,7 +260,8 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) {
                     isSuspend = false,
                     isExpect = false,
                     isFakeOverride = false,
-                    isOperator = false
+                    isOperator = false,
+                    isInfix = false
                 ).apply {
                     if (otherParameterNeeded) {
                         val irValueParameter = createSyntheticIrParameter(

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DelegatedMemberGenerator.kt

@@ -129,6 +129,7 @@ internal class DelegatedMemberGenerator(
                 superFunction.isTailrec,
                 superFunction.isSuspend,
                 superFunction.isOperator,
+                superFunction.isInfix,
                 superFunction.isExpect
             ).apply {
                 descriptor.bind(this)

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/lazy/Fir2IrLazySimpleFunction.kt

@@ -51,6 +51,9 @@ class Fir2IrLazySimpleFunction(
     override val isOperator: Boolean
         get() = fir.isOperator
 
+    override val isInfix: Boolean
+        get() = fir.isInfix
+
     @ObsoleteDescriptorBasedAPI
     override val descriptor: FunctionDescriptor
         get() = super.descriptor as FunctionDescriptor

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt

@@ -490,6 +490,7 @@ fun IrClass.addFakeOverridesViaIncorrectHeuristic(implementedMembers: List<IrSim
                 isTailrec = irFunction.isTailrec
                 isSuspend = irFunction.isSuspend
                 isOperator = irFunction.isOperator
+                isInfix = irFunction.isInfix
                 isExpect = irFunction.isExpect
                 isFakeOverride = true
             }.apply {
@@ -540,7 +541,8 @@ fun createStaticFunctionWithReceivers(
         isSuspend = oldFunction.isSuspend,
         isExpect = oldFunction.isExpect,
         isFakeOverride = isFakeOverride,
-        isOperator = oldFunction is IrSimpleFunction && oldFunction.isOperator
+        isOperator = oldFunction is IrSimpleFunction && oldFunction.isOperator,
+        isInfix = oldFunction is IrSimpleFunction && oldFunction.isInfix
     ).apply {
         descriptor.bind(this)
         parent = irParent

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/builders/declarations/declarationBuilders.kt

@@ -136,7 +136,7 @@ internal fun IrFunctionBuilder.buildFunction(originalDescriptor: FunctionDescrip
         startOffset, endOffset, origin,
         IrSimpleFunctionSymbolImpl(wrappedDescriptor),
         name, visibility, modality, returnType,
-        isInline, isExternal, isTailrec, isSuspend, isOperator, isExpect, isFakeOverride
+        isInline, isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect, isFakeOverride
     ).also {
         wrappedDescriptor.bind(it)
     }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/ir/IrBuilder.kt

@@ -99,6 +99,7 @@ object JsIrBuilder {
         isSuspend: Boolean = false,
         isExpect: Boolean = false,
         isOperator: Boolean = false,
+        isInfix: Boolean = false,
         isFakeOverride: Boolean = false,
         origin: IrDeclarationOrigin = SYNTHESIZED_DECLARATION
     ): IrSimpleFunction = buildFun {
@@ -112,6 +113,7 @@ object JsIrBuilder {
         this.isTailrec = isTailrec
         this.isSuspend = isSuspend
         this.isOperator = isOperator
+        this.isInfix = isInfix
         this.isExpect = isExpect
         this.isFakeOverride = isFakeOverride
     }.also {

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt

@@ -264,6 +264,7 @@ class JvmDeclarationFactory(
                 isTailrec = false
                 isSuspend = fakeOverride.isSuspend
                 isOperator = fakeOverride.isOperator
+                isInfix = fakeOverride.isInfix
                 isExpect = false
                 isFakeOverride = false
             }.apply {

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt

@@ -401,7 +401,7 @@ private fun StatementGenerator.createFunctionForSuspendConversion(
             irSuspendFunReturnType,
             isInline = false, isExternal = false, isTailrec = false,
             isSuspend = true,
-            isOperator = false, isExpect = false, isFakeOverride = false
+            isOperator = false, isInfix = false, isExpect = false, isFakeOverride = false
         )
     }
     adapterFunctionDescriptor.bind(irAdapterFun)

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ReflectionReferencesGenerator.kt

@@ -358,6 +358,7 @@ class ReflectionReferencesGenerator(statementGenerator: StatementGenerator) : St
                 isTailrec = false,
                 isSuspend = adapteeDescriptor.isSuspend || hasSuspendConversion,
                 isOperator = adapteeDescriptor.isOperator, // TODO ?
+                isInfix = adapteeDescriptor.isInfix,
                 isExpect = false,
                 isFakeOverride = false
             ).also { irAdapterFun ->

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/StandaloneDeclarationGenerator.kt

@@ -184,7 +184,7 @@ class StandaloneDeclarationGenerator(private val context: GeneratorContext) {
         val irFunction = with(descriptor) {
             IrFunctionImpl(
                 startOffset, endOffset, origin, symbol, name, visibility, modality, IrUninitializedType,
-                isInline, isExternal, isTailrec, isSuspend, isOperator, isExpect
+                isInline, isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect
             )
         }
         irFunction.metadata = MetadataSource.Function(descriptor)

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/declarations/IrFunctionBuilder.kt

@@ -24,6 +24,7 @@ class IrFunctionBuilder : IrDeclarationBuilder() {
     var isSuspend: Boolean = false
     var isExpect: Boolean = false
     var isOperator: Boolean = false
+    var isInfix: Boolean = false
 
     var isPrimary: Boolean = false
 
@@ -41,12 +42,14 @@ class IrFunctionBuilder : IrDeclarationBuilder() {
             isTailrec = from.isTailrec
             isSuspend = from.isSuspend
             isOperator = from.isOperator
+            isInfix = from.isInfix
             isFakeOverride = from.isFakeOverride
         } else {
             modality = Modality.FINAL
             isTailrec = false
             isSuspend = false
             isOperator = false
+            isInfix = false
         }
 
         if (from is IrConstructor) {

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrSimpleFunction.kt

@@ -19,6 +19,7 @@ interface IrSimpleFunction :
     val isSuspend: Boolean
     val isFakeOverride: Boolean
     val isOperator: Boolean
+    val isInfix: Boolean
 
     var correspondingPropertySymbol: IrPropertySymbol?
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrFunctionImpl.kt

@@ -33,6 +33,7 @@ abstract class IrFunctionCommonImpl(
     override val isTailrec: Boolean,
     override val isSuspend: Boolean,
     override val isOperator: Boolean,
+    override val isInfix: Boolean,
     isExpect: Boolean,
     override val isFakeOverride: Boolean
 ) :
@@ -91,10 +92,11 @@ class IrFunctionImpl(
     override val isTailrec: Boolean,
     override val isSuspend: Boolean,
     override val isOperator: Boolean,
+    isInfix: Boolean,
     isExpect: Boolean,
     override val isFakeOverride: Boolean = origin == IrDeclarationOrigin.FAKE_OVERRIDE
 ) : IrFunctionCommonImpl(startOffset, endOffset, origin, name, visibility, modality, returnType, isInline,
-    isExternal, isTailrec, isSuspend, isOperator, isExpect, isFakeOverride) {
+    isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect, isFakeOverride) {
 
     @ObsoleteDescriptorBasedAPI
     override val descriptor: FunctionDescriptor get() = symbol.descriptor
@@ -120,9 +122,10 @@ class IrFakeOverrideFunctionImpl(
     isTailrec: Boolean,
     isSuspend: Boolean,
     isOperator: Boolean,
+    isInfix: Boolean,
     isExpect: Boolean
 ) : IrFunctionCommonImpl(startOffset, endOffset, origin, name, visibility, modality, returnType, isInline,
-    isExternal, isTailrec, isSuspend, isOperator, isExpect,
+    isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect,
     isFakeOverride = true)
 {
     private var _symbol: IrSimpleFunctionSymbol? = null

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyFunction.kt

@@ -36,6 +36,7 @@ class IrLazyFunction(
     isExpect: Boolean,
     override val isFakeOverride: Boolean,
     override val isOperator: Boolean,
+    override val isInfix: Boolean,
     stubGenerator: DeclarationStubGenerator,
     typeTranslator: TypeTranslator
 ) :

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrBuiltIns.kt

@@ -70,8 +70,8 @@ class IrBuiltIns(
         val symbol = symbolTable.declareSimpleFunctionIfNotExists(operatorDescriptor) {
             val operator = IrFunctionImpl(
                 UNDEFINED_OFFSET, UNDEFINED_OFFSET, BUILTIN_OPERATOR, it, Name.identifier(name), Visibilities.PUBLIC, Modality.FINAL,
-                returnType, isInline = false, isExternal = false, isTailrec = false, isSuspend = false, isOperator = false,
-                isExpect = false, isFakeOverride = false
+                returnType, isInline = false, isExternal = false, isTailrec = false, isSuspend = false,
+                isOperator = false, isInfix = false, isExpect = false, isFakeOverride = false
             )
             operator.parent = packageFragment
             packageFragment.declarations += operator
@@ -156,8 +156,8 @@ class IrBuiltIns(
         return symbolTable.declareSimpleFunctionIfNotExists(operatorDescriptor) {
             val operator = IrFunctionImpl(
                 UNDEFINED_OFFSET, UNDEFINED_OFFSET, BUILTIN_OPERATOR, it, name, Visibilities.PUBLIC, Modality.FINAL, returnIrType,
-                isInline = false, isExternal = false, isTailrec = false, isSuspend = false, isOperator = false, isExpect = false,
-                isFakeOverride = false
+                isInline = false, isExternal = false, isTailrec = false, isSuspend = false, isOperator = false, isInfix = false,
+                isExpect = false, isFakeOverride = false
             )
             operator.parent = packageFragment
             packageFragment.declarations += operator

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrFunctionFactory.kt

@@ -304,6 +304,7 @@ class IrFunctionFactory(private val irBuiltIns: IrBuiltIns, private val symbolTa
                     isTailrec = false,
                     isSuspend = isSuspend,
                     isOperator = true,
+                    isInfix = false,
                     isExpect = false,
                     isFakeOverride = false
                 )
@@ -374,7 +375,7 @@ class IrFunctionFactory(private val irBuiltIns: IrBuiltIns, private val symbolTa
                 descriptor.run {
                     IrFunctionImpl(
                         offset, offset, memberOrigin, it, name, visibility, modality, returnType,
-                        isInline, isExternal, isTailrec, isSuspend, isOperator, isExpect, true
+                        isInline, isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect, true
                     )
                 }
             }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeclarationStubGenerator.kt

@@ -220,7 +220,8 @@ class DeclarationStubGenerator(
                 it, descriptor,
                 descriptor.name, descriptor.visibility, descriptor.modality,
                 descriptor.isInline, descriptor.isExternal, descriptor.isTailrec, descriptor.isSuspend, descriptor.isExpect,
-                isFakeOverride = (origin == IrDeclarationOrigin.FAKE_OVERRIDE), isOperator = descriptor.isOperator,
+                isFakeOverride = (origin == IrDeclarationOrigin.FAKE_OVERRIDE),
+                isOperator = descriptor.isOperator, isInfix = descriptor.isInfix,
                 stubGenerator = this, typeTranslator = typeTranslator
             )
         }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeepCopyIrTreeWithSymbols.kt

@@ -165,7 +165,8 @@ open class DeepCopyIrTreeWithSymbols(
             isSuspend = declaration.isSuspend,
             isExpect = declaration.isExpect,
             isFakeOverride = declaration.isFakeOverride,
-            isOperator = declaration.isOperator
+            isOperator = declaration.isOperator,
+            isInfix = declaration.isInfix
         ).apply {
             overriddenSymbols = declaration.overriddenSymbols.map {
                 symbolRemapper.getReferencedFunction(it) as IrSimpleFunctionSymbol

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/RenderIrElement.kt

@@ -385,7 +385,8 @@ class RenderIrElementVisitor(private val normalizeNames: Boolean = false) : IrEl
             "suspend".takeIf { isSuspend },
             "expect".takeIf { isExpect },
             "fake_override".takeIf { isFakeOverride },
-            "operator".takeIf { isOperator }
+            "operator".takeIf { isOperator },
+            "infix".takeIf { isInfix }
         )
 
     private fun IrFunction.renderTypeParameters(): String =

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/overrides.kt

@@ -24,7 +24,7 @@ fun SymbolTable.declareSimpleFunctionWithOverrides(
         with(descriptor) {
             IrFunctionImpl(
                 startOffset, endOffset, origin, it, nameProvider.nameForDeclaration(this),
-                visibility, modality, IrUninitializedType, isInline, isExternal, isTailrec, isSuspend, isOperator, isExpect
+                visibility, modality, IrUninitializedType, isInline, isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect
             ).also { declaration ->
                 declaration.metadata = MetadataSource.Function(this)
             }

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/FakeOverrideCopier.kt

@@ -59,7 +59,8 @@ class FakeOverrideCopier(
             isTailrec = declaration.isTailrec,
             isSuspend = declaration.isSuspend,
             isExpect = declaration.isExpect,
-            isOperator = declaration.isOperator
+            isOperator = declaration.isOperator,
+            isInfix = declaration.isInfix
         ).apply {
             transformFunctionChildren(declaration)
         }

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileDeserializer.kt

@@ -1191,6 +1191,7 @@ abstract class IrFileDeserializer(
                     flags.isTailrec,
                     flags.isSuspend,
                     flags.isOperator,
+                    flags.isInfix,
                     flags.isExpect,
                     flags.isFakeOverride
                 )

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/encodings/BinaryFlags.kt

@@ -54,6 +54,7 @@ inline class FunctionFlags(val flags: Long) {
     val visibility: Visibility get() = ProtoEnumFlags.visibility(IrFlags.VISIBILITY.get(flags.toInt()))
 
     val isOperator: Boolean get() = IrFlags.IS_OPERATOR.get(flags.toInt())
+    val isInfix: Boolean get() = IrFlags.IS_INFIX.get(flags.toInt())
     val isInline: Boolean get() = IrFlags.IS_INLINE.get(flags.toInt())
     val isTailrec: Boolean get() = IrFlags.IS_TAILREC.get(flags.toInt())
     val isExternal: Boolean get() = IrFlags.IS_EXTERNAL_FUNCTION.get(flags.toInt())
@@ -76,7 +77,7 @@ inline class FunctionFlags(val flags: Long) {
 
                 val flags = IrFlags.getFunctionFlags(
                     hasAnnotation, visibility, modality, kind,
-                    isOperator, false, isInline, isTailrec, isExternal, isSuspend, isExpect
+                    isOperator, isInfix, isInline, isTailrec, isExternal, isSuspend, isExpect
                 )
 
                 return flags.toLong()

compiler/testData/ir/irText/expressions/booleanOperators.txt

@@ -28,7 +28,7 @@ FILE fqName:<root> fileName:/booleanOperators.kt
     VALUE_PARAMETER name:b index:1 type:kotlin.Boolean
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun test1x (a: kotlin.Boolean, b: kotlin.Boolean): kotlin.Boolean declared in <root>'
-        CALL 'public final fun and (other: kotlin.Boolean): kotlin.Boolean declared in kotlin.Boolean' type=kotlin.Boolean origin=null
+        CALL 'public final fun and (other: kotlin.Boolean): kotlin.Boolean [infix] declared in kotlin.Boolean' type=kotlin.Boolean origin=null
           $this: GET_VAR 'a: kotlin.Boolean declared in <root>.test1x' type=kotlin.Boolean origin=null
           other: GET_VAR 'b: kotlin.Boolean declared in <root>.test1x' type=kotlin.Boolean origin=null
   FUN name:test2x visibility:public modality:FINAL <> (a:kotlin.Boolean, b:kotlin.Boolean) returnType:kotlin.Boolean
@@ -36,6 +36,6 @@ FILE fqName:<root> fileName:/booleanOperators.kt
     VALUE_PARAMETER name:b index:1 type:kotlin.Boolean
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun test2x (a: kotlin.Boolean, b: kotlin.Boolean): kotlin.Boolean declared in <root>'
-        CALL 'public final fun or (other: kotlin.Boolean): kotlin.Boolean declared in kotlin.Boolean' type=kotlin.Boolean origin=null
+        CALL 'public final fun or (other: kotlin.Boolean): kotlin.Boolean [infix] declared in kotlin.Boolean' type=kotlin.Boolean origin=null
           $this: GET_VAR 'a: kotlin.Boolean declared in <root>.test2x' type=kotlin.Boolean origin=null
           other: GET_VAR 'b: kotlin.Boolean declared in <root>.test2x' type=kotlin.Boolean origin=null

compiler/testData/ir/irText/stubs/constFromBuiltins__kotlin.Int.txt

@@ -1,6 +1,6 @@
 CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Int modality:FINAL visibility:public superTypes:[<unbound IrClassPublicSymbolImpl>; <unbound IrClassPublicSymbolImpl><kotlin.Int>; <unbound IrClassPublicSymbolImpl>]
   $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
-  FUN IR_EXTERNAL_DECLARATION_STUB name:and visibility:public modality:FINAL <> ($this:kotlin.Int, other:kotlin.Int) returnType:kotlin.Int
+  FUN IR_EXTERNAL_DECLARATION_STUB name:and visibility:public modality:FINAL <> ($this:kotlin.Int, other:kotlin.Int) returnType:kotlin.Int [infix]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:kotlin.Int
   FUN IR_EXTERNAL_DECLARATION_STUB name:compareTo visibility:public modality:FINAL <> ($this:kotlin.Int, other:<unbound IrClassPublicSymbolImpl>) returnType:kotlin.Int [operator]
@@ -76,7 +76,7 @@ CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Int modality:FINAL visibility:publ
   FUN IR_EXTERNAL_DECLARATION_STUB name:minus visibility:public modality:FINAL <> ($this:kotlin.Int, other:<unbound IrClassPublicSymbolImpl>) returnType:kotlin.Int [operator]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:<unbound IrClassPublicSymbolImpl>
-  FUN IR_EXTERNAL_DECLARATION_STUB name:or visibility:public modality:FINAL <> ($this:kotlin.Int, other:kotlin.Int) returnType:kotlin.Int
+  FUN IR_EXTERNAL_DECLARATION_STUB name:or visibility:public modality:FINAL <> ($this:kotlin.Int, other:kotlin.Int) returnType:kotlin.Int [infix]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:kotlin.Int
   FUN IR_EXTERNAL_DECLARATION_STUB name:plus visibility:public modality:FINAL <> ($this:kotlin.Int, other:<unbound IrClassPublicSymbolImpl>) returnType:kotlin.Int [operator]
@@ -139,10 +139,10 @@ CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Int modality:FINAL visibility:publ
       <unbound>(1 = '1.1')
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:<unbound IrClassPublicSymbolImpl>
-  FUN IR_EXTERNAL_DECLARATION_STUB name:shl visibility:public modality:FINAL <> ($this:kotlin.Int, bitCount:kotlin.Int) returnType:kotlin.Int
+  FUN IR_EXTERNAL_DECLARATION_STUB name:shl visibility:public modality:FINAL <> ($this:kotlin.Int, bitCount:kotlin.Int) returnType:kotlin.Int [infix]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:bitCount index:0 type:kotlin.Int
-  FUN IR_EXTERNAL_DECLARATION_STUB name:shr visibility:public modality:FINAL <> ($this:kotlin.Int, bitCount:kotlin.Int) returnType:kotlin.Int
+  FUN IR_EXTERNAL_DECLARATION_STUB name:shr visibility:public modality:FINAL <> ($this:kotlin.Int, bitCount:kotlin.Int) returnType:kotlin.Int [infix]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:bitCount index:0 type:kotlin.Int
   FUN IR_EXTERNAL_DECLARATION_STUB name:times visibility:public modality:FINAL <> ($this:kotlin.Int, other:<unbound IrClassPublicSymbolImpl>) returnType:kotlin.Int [operator]
@@ -200,10 +200,10 @@ CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Int modality:FINAL visibility:publ
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
   FUN IR_EXTERNAL_DECLARATION_STUB name:unaryPlus visibility:public modality:FINAL <> ($this:kotlin.Int) returnType:kotlin.Int [operator]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
-  FUN IR_EXTERNAL_DECLARATION_STUB name:ushr visibility:public modality:FINAL <> ($this:kotlin.Int, bitCount:kotlin.Int) returnType:kotlin.Int
+  FUN IR_EXTERNAL_DECLARATION_STUB name:ushr visibility:public modality:FINAL <> ($this:kotlin.Int, bitCount:kotlin.Int) returnType:kotlin.Int [infix]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:bitCount index:0 type:kotlin.Int
-  FUN IR_EXTERNAL_DECLARATION_STUB name:xor visibility:public modality:FINAL <> ($this:kotlin.Int, other:kotlin.Int) returnType:kotlin.Int
+  FUN IR_EXTERNAL_DECLARATION_STUB name:xor visibility:public modality:FINAL <> ($this:kotlin.Int, other:kotlin.Int) returnType:kotlin.Int [infix]
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int
     VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:kotlin.Int
   CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Companion modality:FINAL visibility:public [companion] superTypes:[<unbound IrClassPublicSymbolImpl>]

compiler/testData/ir/sourceRanges/kt17108.txt

@@ -3,13 +3,13 @@
     @4:0..26:1 VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Boolean
     @8:20..38 FUN name:not visibility:public modality:ABSTRACT <> ($this:<root>.Boolean) returnType:<root>.Boolean [operator]
       @8:4..38 VALUE_PARAMETER name:<this> type:<root>.Boolean
-    @13:10..42 FUN name:and visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:<root>.Boolean
+    @13:10..42 FUN name:and visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:<root>.Boolean [infix]
       @13:4..42 VALUE_PARAMETER name:<this> type:<root>.Boolean
       @13:18..32 VALUE_PARAMETER name:other index:0 type:<root>.Boolean
-    @18:10..41 FUN name:or visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:<root>.Boolean
+    @18:10..41 FUN name:or visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:<root>.Boolean [infix]
       @18:4..41 VALUE_PARAMETER name:<this> type:<root>.Boolean
       @18:17..31 VALUE_PARAMETER name:other index:0 type:<root>.Boolean
-    @23:10..42 FUN name:xor visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:<root>.Boolean
+    @23:10..42 FUN name:xor visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:<root>.Boolean [infix]
       @23:4..42 VALUE_PARAMETER name:<this> type:<root>.Boolean
       @23:18..32 VALUE_PARAMETER name:other index:0 type:<root>.Boolean
     @25:4..38 FUN name:compareTo visibility:public modality:ABSTRACT <> ($this:<root>.Boolean, other:<root>.Boolean) returnType:kotlin.Int

plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt

@@ -287,7 +287,8 @@ interface IrBuilderExtension {
             with(descriptor) {
                 IrFunctionImpl(
                     fieldSymbol.owner.startOffset, fieldSymbol.owner.endOffset, SERIALIZABLE_PLUGIN_ORIGIN, symbol,
-                    name, visibility, modality, returnType!!.toIrType(), isInline, isExternal, isTailrec, isSuspend, isOperator, isExpect
+                    name, visibility, modality, returnType!!.toIrType(),
+                    isInline, isExternal, isTailrec, isSuspend, isOperator, isInfix, isExpect
                 )
             }.also { f ->
                 generateOverriddenFunctionSymbols(f, compilerContext.symbolTable)