[FIR] Implement EXPECT_AND_ACTUAL_IN_THE_SAME_MODULE

^KT-60367 Fixed
KT review: https://jetbrains.team/p/kt/reviews/14064/timeline
IJ review: https://jetbrains.team/p/ij/reviews/124657/timeline

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

@@ -3042,6 +3042,13 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.EXPECT_AND_ACTUAL_IN_THE_SAME_MODULE) { firDiagnostic ->
+        ExpectAndActualInTheSameModuleImpl(
+            firSymbolBuilder.buildSymbol(firDiagnostic.a),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.METHOD_OF_ANY_IMPLEMENTED_IN_INTERFACE) { firDiagnostic ->
         MethodOfAnyImplementedInInterfaceImpl(
             firDiagnostic as KtPsiDiagnostic,

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

@@ -2151,6 +2151,11 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         val conflictingDeclarations: List<KtSymbol>
     }
 
+    interface ExpectAndActualInTheSameModule : KtFirDiagnostic<KtNamedDeclaration> {
+        override val diagnosticClass get() = ExpectAndActualInTheSameModule::class
+        val declaration: KtSymbol
+    }
+
     interface MethodOfAnyImplementedInInterface : KtFirDiagnostic<PsiElement> {
         override val diagnosticClass get() = MethodOfAnyImplementedInInterface::class
     }

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

@@ -2577,6 +2577,12 @@ internal class PackageOrClassifierRedeclarationImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<KtNamedDeclaration>(firDiagnostic, token), KtFirDiagnostic.PackageOrClassifierRedeclaration
 
+internal class ExpectAndActualInTheSameModuleImpl(
+    override val declaration: KtSymbol,
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<KtNamedDeclaration>(firDiagnostic, token), KtFirDiagnostic.ExpectAndActualInTheSameModule
+
 internal class MethodOfAnyImplementedInInterfaceImpl(
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -24854,6 +24854,24 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualClassesAreInBeta_suppressWarningWithLv.kt");
             }
 
+            @Test
+            @TestMetadata("expectActualInTheSameModule.kt")
+            public void testExpectActualInTheSameModule() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualInTheSameModule.kt");
+            }
+
+            @Test
+            @TestMetadata("expectActualInTheSameModuleDifferentFiles.kt")
+            public void testExpectActualInTheSameModuleDifferentFiles() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualInTheSameModuleDifferentFiles.kt");
+            }
+
+            @Test
+            @TestMetadata("expectActualMainInTheSameModuleDifferentFiles.kt")
+            public void testExpectActualMainInTheSameModuleDifferentFiles() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualMainInTheSameModuleDifferentFiles.kt");
+            }
+
             @Test
             @TestMetadata("expectDataObject.kt")
             public void testExpectDataObject() throws Exception {

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -24854,6 +24854,24 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualClassesAreInBeta_suppressWarningWithLv.kt");
             }
 
+            @Test
+            @TestMetadata("expectActualInTheSameModule.kt")
+            public void testExpectActualInTheSameModule() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualInTheSameModule.kt");
+            }
+
+            @Test
+            @TestMetadata("expectActualInTheSameModuleDifferentFiles.kt")
+            public void testExpectActualInTheSameModuleDifferentFiles() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualInTheSameModuleDifferentFiles.kt");
+            }
+
+            @Test
+            @TestMetadata("expectActualMainInTheSameModuleDifferentFiles.kt")
+            public void testExpectActualMainInTheSameModuleDifferentFiles() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/multiplatform/expectActualMainInTheSameModuleDifferentFiles.kt");
+            }
+
             @Test
             @TestMetadata("expectDataObject.kt")
             public void testExpectDataObject() throws Exception {