[FIR] Don't report NOT_A_MULTIPLATFORM_COMPILATION for declarations with enabled shouldSkipErrorTypeReporting

^KT-64103 Fixed

(cherry picked from commit 80bd87b)

Author: KvanTTT

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

@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
 import org.jetbrains.kotlin.diagnostics.SourceElementPositioningStrategies
 import org.jetbrains.kotlin.diagnostics.reportOn
-import org.jetbrains.kotlin.diagnostics.requireNotNull
 import org.jetbrains.kotlin.fir.*
 import org.jetbrains.kotlin.fir.analysis.checkers.MppCheckerKind
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
@@ -38,7 +37,9 @@ object FirExpectActualDeclarationChecker : FirBasicDeclarationChecker(MppChecker
     override fun check(declaration: FirDeclaration, context: CheckerContext, reporter: DiagnosticReporter) {
         if (declaration !is FirMemberDeclaration) return
         if (!context.session.languageVersionSettings.supportsFeature(LanguageFeature.MultiPlatformProjects)) {
-            if ((declaration.isExpect || declaration.isActual) && containsExpectOrActualModifier(declaration)) {
+            if ((declaration.isExpect || declaration.isActual) && containsExpectOrActualModifier(declaration) &&
+                declaration.source?.kind?.shouldSkipErrorTypeReporting == false
+            ) {
                 reporter.reportOn(
                     declaration.source,
                     FirErrors.NOT_A_MULTIPLATFORM_COMPILATION,

compiler/testData/diagnostics/tests/sourceCompatibility/noMultiplatformProjects.fir.kt

@@ -8,7 +8,7 @@
 
 <!NOT_A_MULTIPLATFORM_COMPILATION!>expect<!> class ExplicitExpect {
     <!NOT_A_MULTIPLATFORM_COMPILATION, WRONG_MODIFIER_TARGET!>expect<!> fun explicitFoo()
-    <!NOT_A_MULTIPLATFORM_COMPILATION, NOT_A_MULTIPLATFORM_COMPILATION, NOT_A_MULTIPLATFORM_COMPILATION, WRONG_MODIFIER_TARGET!>expect<!> val explicitX: Int
+    <!NOT_A_MULTIPLATFORM_COMPILATION, WRONG_MODIFIER_TARGET!>expect<!> val explicitX: Int
     <!NOT_A_MULTIPLATFORM_COMPILATION, WRONG_MODIFIER_TARGET!>expect<!> class ExplicitInner
 }
 
@@ -21,4 +21,4 @@
     }
     <!NOT_A_MULTIPLATFORM_COMPILATION!>actual<!> val x: Int = 0
     <!NOT_A_MULTIPLATFORM_COMPILATION!>actual<!> class Inner
-}
+}