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;)"/>. 2399AssignmentKind assignmentKind = AssignmentKind.Assignment, 2427ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2429else if (assignmentKind == AssignmentKind.Argument) 2449ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3011assignmentKind: AssignmentKind.Assignment); 3063returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3659valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 3877useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 3892useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4427VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 4748_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 4793fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 4805checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 4908checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5297AssignmentKind.Argument); 5353AssignmentKind.Argument, 5729TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 5824AssignmentKind.Assignment, 5865assignmentKind: AssignmentKind.Assignment); 6292AssignmentKind.Assignment, 7673assignmentKind: AssignmentKind.Argument, 8589AssignmentKind.Assignment, 8603private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8620AssignmentKind assignmentKind, 8632bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 8666Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 8824AssignmentKind assignmentKind, 9079AssignmentKind assignmentKind, 9403if (assignmentKind == AssignmentKind.Argument) 9629AssignmentKind assignmentKind, 9697AssignmentKind.Argument, 9848AssignmentKind assignmentKind, 9860if (assignmentKind == AssignmentKind.Argument) 10281rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10605valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10622AssignmentKind.Assignment, 10759AssignmentKind assignmentKind = AssignmentKind.Assignment; 10771assignmentKind = AssignmentKind.Argument; 10824AssignmentKind.Assignment); 10916assignmentKind: AssignmentKind.Assignment); 10958ReportNullableAssignmentIfNecessary(argument, paramType, argumentType, useLegacyWarnings: false, AssignmentKind.Argument, parameterOpt: parameter); 11321AssignmentKind.Assignment); 11496AssignmentKind.ForEachIterationVariable, 11632assignmentKind: AssignmentKind.Argument, 12357_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);