[FIR] KT-46483: Forbid annotations in where Clauses

Merge-request: KT-MR-7208
Merged-by: Nikolay Lunyak <lunyak.kolya@mail.ru>

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -955,6 +955,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.ANNOTATION_IN_WHERE_CLAUSE_ERROR) { firDiagnostic ->
+        AnnotationInWhereClauseErrorImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.OPT_IN_USAGE) { firDiagnostic ->
         OptInUsageImpl(
             firDiagnostic.a,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -689,6 +689,10 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = WrongExtensionFunctionTypeWarning::class
     }
 
+    abstract class AnnotationInWhereClauseError : KtFirDiagnostic<KtAnnotationEntry>() {
+        override val diagnosticClass get() = AnnotationInWhereClauseError::class
+    }
+
     abstract class OptInUsage : KtFirDiagnostic<PsiElement>() {
         override val diagnosticClass get() = OptInUsage::class
         abstract val optInMarkerFqName: FqName

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -827,6 +827,11 @@ internal class WrongExtensionFunctionTypeWarningImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.WrongExtensionFunctionTypeWarning(), KtAbstractFirDiagnostic<KtAnnotationEntry>
 
+internal class AnnotationInWhereClauseErrorImpl(
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.AnnotationInWhereClauseError(), KtAbstractFirDiagnostic<KtAnnotationEntry>
+
 internal class OptInUsageImpl(
     override val optInMarkerFqName: FqName,
     override val message: String,

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -423,6 +423,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
             runTest("compiler/testData/diagnostics/tests/kt435.kt");
         }
 
+        @Test
+        @TestMetadata("kt46483.kt")
+        public void testKt46483() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/kt46483.kt");
+        }
+
         @Test
         @TestMetadata("kt49438.kt")
         public void testKt49438() throws Exception {