FIR: introduce delegate diagnostics

This commit adds diagnostics for the following

* DELEGATE_SPECIAL_FUNCTION_MISSING
* DELEGATE_SPECIAL_FUNCTION_AMBIGUITY
* DELEGATE_SPECIAL_FUNCTION_NONE_APPLICABLE

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

@@ -1862,6 +1862,35 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.DELEGATE_SPECIAL_FUNCTION_MISSING) { firDiagnostic ->
+        DelegateSpecialFunctionMissingImpl(
+            firDiagnostic.a,
+            firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.b),
+            firDiagnostic.c,
+            firDiagnostic as FirPsiDiagnostic<*>,
+            token,
+        )
+    }
+    add(FirErrors.DELEGATE_SPECIAL_FUNCTION_AMBIGUITY) { firDiagnostic ->
+        DelegateSpecialFunctionAmbiguityImpl(
+            firDiagnostic.a,
+            firDiagnostic.b.map { abstractFirBasedSymbol ->
+                firSymbolBuilder.buildSymbol(abstractFirBasedSymbol.fir as FirDeclaration)
+            },
+            firDiagnostic as FirPsiDiagnostic<*>,
+            token,
+        )
+    }
+    add(FirErrors.DELEGATE_SPECIAL_FUNCTION_NONE_APPLICABLE) { firDiagnostic ->
+        DelegateSpecialFunctionNoneApplicableImpl(
+            firDiagnostic.a,
+            firDiagnostic.b.map { abstractFirBasedSymbol ->
+                firSymbolBuilder.buildSymbol(abstractFirBasedSymbol.fir as FirDeclaration)
+            },
+            firDiagnostic as FirPsiDiagnostic<*>,
+            token,
+        )
+    }
     add(FirErrors.TOPLEVEL_TYPEALIASES_ONLY) { firDiagnostic ->
         ToplevelTypealiasesOnlyImpl(
             firDiagnostic as FirPsiDiagnostic<*>,

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

@@ -1305,6 +1305,25 @@ sealed class KtFirDiagnostic<PSI: PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val candidates: List<KtSymbol>
     }
 
+    abstract class DelegateSpecialFunctionMissing : KtFirDiagnostic<KtExpression>() {
+        override val diagnosticClass get() = DelegateSpecialFunctionMissing::class
+        abstract val expectedFunctionSignature: String
+        abstract val delegateType: KtType
+        abstract val description: String
+    }
+
+    abstract class DelegateSpecialFunctionAmbiguity : KtFirDiagnostic<KtExpression>() {
+        override val diagnosticClass get() = DelegateSpecialFunctionAmbiguity::class
+        abstract val expectedFunctionSignature: String
+        abstract val candidates: List<KtSymbol>
+    }
+
+    abstract class DelegateSpecialFunctionNoneApplicable : KtFirDiagnostic<KtExpression>() {
+        override val diagnosticClass get() = DelegateSpecialFunctionNoneApplicable::class
+        abstract val expectedFunctionSignature: String
+        abstract val candidates: List<KtSymbol>
+    }
+
     abstract class ToplevelTypealiasesOnly : KtFirDiagnostic<KtTypeAlias>() {
         override val diagnosticClass get() = ToplevelTypealiasesOnly::class
     }

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

@@ -2116,6 +2116,34 @@ internal class NextNoneApplicableImpl(
     override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
 }
 
+internal class DelegateSpecialFunctionMissingImpl(
+    override val expectedFunctionSignature: String,
+    override val delegateType: KtType,
+    override val description: String,
+    firDiagnostic: FirPsiDiagnostic<*>,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.DelegateSpecialFunctionMissing(), KtAbstractFirDiagnostic<KtExpression> {
+    override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
+}
+
+internal class DelegateSpecialFunctionAmbiguityImpl(
+    override val expectedFunctionSignature: String,
+    override val candidates: List<KtSymbol>,
+    firDiagnostic: FirPsiDiagnostic<*>,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.DelegateSpecialFunctionAmbiguity(), KtAbstractFirDiagnostic<KtExpression> {
+    override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
+}
+
+internal class DelegateSpecialFunctionNoneApplicableImpl(
+    override val expectedFunctionSignature: String,
+    override val candidates: List<KtSymbol>,
+    firDiagnostic: FirPsiDiagnostic<*>,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.DelegateSpecialFunctionNoneApplicable(), KtAbstractFirDiagnostic<KtExpression> {
+    override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
+}
+
 internal class ToplevelTypealiasesOnlyImpl(
     firDiagnostic: FirPsiDiagnostic<*>,
     override val token: ValidityToken,