[FIR] Fix non-fake sources for constructor delegates

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirCommonConstructorDelegationIssuesChecker.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.analysis.checkers.declaration
 
+import org.jetbrains.kotlin.fir.FirFakeSourceElementKind
 import org.jetbrains.kotlin.fir.FirSourceElement
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
 import org.jetbrains.kotlin.fir.analysis.diagnostics.DiagnosticReporter
@@ -48,8 +49,12 @@ object FirCommonConstructorDelegationIssuesChecker : FirMemberDeclarationChecker
 
         if (hasPrimaryConstructor) {
             for (it in otherConstructors) {
-                if (it.delegatedConstructor?.isThis == false) {
+                if (it.delegatedConstructor?.isThis != true) {
-                    reporter.reportPrimaryConstructorDelegationCallExpected(it.delegatedConstructor?.source)
+                    if (it.delegatedConstructor?.source != null) {
+                        reporter.reportPrimaryConstructorDelegationCallExpected(it.delegatedConstructor?.source)
+                    } else {
+                        reporter.reportPrimaryConstructorDelegationCallExpected(it.source)
+                    }
                 }
             }
         } else {
@@ -59,7 +64,7 @@ object FirCommonConstructorDelegationIssuesChecker : FirMemberDeclarationChecker
                 // couldn't find proper super() constructor implicitly
                 if (
                     callee is FirErrorNamedReference && callee.diagnostic is ConeAmbiguityError &&
-                    it.delegatedConstructor?.source?.startOffset == it.delegatedConstructor?.source?.endOffset
+                    it.delegatedConstructor?.source?.kind is FirFakeSourceElementKind
                 ) {
                     reporter.reportExplicitDelegationCallRequired(it.source)
                 }

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirDelegationSuperCallInEnumConstructorChecker.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.analysis.checkers.declaration
 
 import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.fir.FirFakeSourceElementKind
 import org.jetbrains.kotlin.fir.FirSourceElement
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
 import org.jetbrains.kotlin.fir.analysis.diagnostics.DiagnosticReporter
@@ -21,13 +22,10 @@ object FirDelegationSuperCallInEnumConstructorChecker : FirMemberDeclarationChec
         }
 
         for (it in declaration.declarations) {
-            // checking offsets is needed because we
-            // still have a real source element ("") here,
-            // even if the user hasn't written anything
             if (
                 it is FirConstructor && !it.isPrimary &&
                 it.delegatedConstructor?.isThis == false &&
-                it.delegatedConstructor?.source?.startOffset != it.delegatedConstructor?.source?.endOffset
+                it.delegatedConstructor?.source?.kind !is FirFakeSourceElementKind
             ) {
                 reporter.report(it.delegatedConstructor?.source)
             }

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt

@@ -842,7 +842,11 @@ class DeclarationsConverter(
             }
 
         return buildDelegatedConstructorCall {
-            source = constructorDelegationCall.toFirSourceElement()
+            source = if (isImplicit) {
+                constructorDelegationCall.toFirSourceElement().fakeElement(FirFakeSourceElementKind.ImplicitConstructor)
+            } else {
+                constructorDelegationCall.toFirSourceElement()
+            }
             constructedTypeRef = delegatedType
             this.isThis = isThis
             extractArgumentsFrom(firValueArguments, stubMode)

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -1096,7 +1096,11 @@ class RawFirBuilder(
             hasPrimaryConstructor: Boolean,
         ): FirDelegatedConstructorCall {
             val isThis = isCallToThis //|| (isImplicit && hasPrimaryConstructor)
-            val source = this.toFirSourceElement()
+            val source = if (isImplicit) {
+                this.toFirSourceElement(FirFakeSourceElementKind.ImplicitConstructor)
+            } else {
+                this.toFirSourceElement()
+            }
             val delegatedType = when {
                 isThis -> delegatedSelfTypeRef
                 else -> delegatedSuperTypeRef

compiler/fir/raw-fir/psi2fir/testData/rawBuilder/declarations/constructorInObject.txt

@@ -19,7 +19,7 @@ FILE: constructorInObject.kt
             }
 
             public? constructor(): R|<anonymous>| {
-                this<R|<anonymous>|>()
+                super<R|B|>()
             }
 
         }