253/// The delegate is invoked by <see cref="VisitConversion(BoundConversion, BoundExpression, Conversion, TypeWithAnnotations, TypeWithState, bool, bool, bool, AssignmentKind, ParameterSymbol, bool, bool, bool, bool, Optional&lt;LocalState&gt;,bool, Location, ArrayBuilder&lt;VisitResult&gt;)"/>. 2405AssignmentKind assignmentKind = AssignmentKind.Assignment, 2433ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2435else if (assignmentKind == AssignmentKind.Argument) 2455ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3017assignmentKind: AssignmentKind.Assignment); 3069returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3665valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 3931assignmentKind: AssignmentKind.Argument, 3970useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4488VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 4809_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 4854fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 4866checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 4969checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5357AssignmentKind.Argument); 5470AssignmentKind.Argument, 5852TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 5947AssignmentKind.Assignment, 5988assignmentKind: AssignmentKind.Assignment); 6415AssignmentKind.Assignment, 7844assignmentKind: AssignmentKind.Argument, 8792AssignmentKind.Assignment, 8806private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8823AssignmentKind assignmentKind, 8835bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 8869Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9027AssignmentKind assignmentKind, 9282AssignmentKind assignmentKind, 9606if (assignmentKind == AssignmentKind.Argument) 9840AssignmentKind assignmentKind, 9908AssignmentKind.Argument, 10059AssignmentKind assignmentKind, 10071if (assignmentKind == AssignmentKind.Argument) 10492rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10816valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10833AssignmentKind.Assignment, 11033AssignmentKind assignmentKind = AssignmentKind.Assignment; 11051assignmentKind = AssignmentKind.Argument; 11104AssignmentKind.Assignment); 11243assignmentKind: AssignmentKind.Assignment); 11677AssignmentKind.Assignment); 11853AssignmentKind.ForEachIterationVariable, 11990assignmentKind: AssignmentKind.Argument, 12223assignmentKind: AssignmentKind.Argument, 12818_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);