[FIR] Ignore error declarations in conflict checking

compiler/fir/analysis-tests/testData/resolve/diagnostics/conflictingOverloads.fir.txt

@@ -64,6 +64,8 @@ FILE: conflictingOverloads.kt
         public get(): R|kotlin/Int|
     public final val u: R|kotlin/Int| = Int(20)
         public get(): R|kotlin/Int|
+    <ERROR PROPERTY: Destructuring declarations are only allowed for local variables/values>
+    <ERROR PROPERTY: Destructuring declarations are only allowed for local variables/values>
     public final typealias TA = R|A|
     public final typealias TA = R|B|
     public final typealias BA = R|A|

compiler/fir/analysis-tests/testData/resolve/diagnostics/conflictingOverloads.kt

@@ -33,6 +33,9 @@ enum class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>B<!>
 val <!REDECLARATION!>u<!> = 10
 val <!REDECLARATION!>u<!> = 20
 
+val <!SYNTAX!>(a,b)<!> = 30 to 40
+val <!SYNTAX!>(c,d)<!> = 50 to 60
+
 typealias <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>TA<!> = A
 typealias <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>TA<!> = B
 

compiler/fir/analysis-tests/testData/resolve/diagnostics/conflictingOverloads.ll.kt

@@ -37,6 +37,9 @@ enum class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>B<!>
 val <!REDECLARATION!>u<!> = 10
 val <!REDECLARATION!>u<!> = 20
 
+val <!SYNTAX!>(a,b)<!> = 30 to 40
+val <!SYNTAX!>(c,d)<!> = 50 to 60
+
 typealias <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>TA<!> = A
 typealias <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>TA<!> = B
 

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

@@ -77,6 +77,7 @@ object FirConflictsDeclarationChecker : FirBasicDeclarationChecker() {
             FirPackageMemberScope(file.packageFqName, context.sessionHolder.session)
         }
         for (topLevelDeclaration in file.declarations) {
+            if (topLevelDeclaration is FirErrorProperty || topLevelDeclaration is FirErrorFunction) continue
             inspector.collectWithExternalConflicts(topLevelDeclaration, file, context.session, packageMemberScope)
         }
     }