Inlay Hints for Object Pascal

The name of each parameter appears before its argument. With Literal arguments, only numbers, strings, characters, Boolean values, nil and bracket lists of literals are named, the arguments whose purpose is not evident from the call. With All arguments, every argument is named.

// Literal arguments
ClampTemperature(Forecast, MinValue: -40.0, MaxValue: 50.0);

// All arguments
ClampTemperature(Value: Forecast, MinValue: -40.0, MaxValue: 50.0);

An argument passed to a var or out parameter is preceded by var or out. The variables written by the routine are visible at the call, without opening its declaration. Value and const parameters get no mark.

GetTemperatureRange(Station.Readings, out MinTemp, out MaxTemp);
CountWetAndDryDays(Station.Readings, var WetDays, var DryDays);
ClampTemperature(var Forecast, -40.0, 50.0);

The same arguments can be colored instead of marked, or both. The color applies to the argument at that one call only; in the next statement the variable has its normal color. In Summary.WetDays both names are colored, in Forecasts[Day] only Forecasts. The default colors are amber for var and coral for out; on Pro, the var argument and out argument rows of Edit symbol colors… set them.

GetTemperatureRange(Station.Readings, MinTemp, MaxTemp);
var Spread := MaxTemp - MinTemp;
CountWetAndDryDays(Station.Readings, WetDays, DryDays);
CountWetAndDryDays(Station.Readings, Summary.WetDays, Summary.DryDays);
ClampTemperature(Forecasts[Day], -40.0, 50.0);

An inline variable or constant declared without a type shows its inferred type after the name. This covers inline var and const declarations and the loop variable of a for loop. The type is computed by the same inference as hover, so hint and hover show the same type; a type that does not resolve gets no hint.

const Title: string = 'Weekly Statistics';
var Spread: Extended := MaxTemp - MinTemp;
var TotalDays: Integer := WetDays + DryDays;
var WetShare: Int64 := Round(WetDays / TotalDays * 100);
for var Day: Integer := 1 to TotalDays do
  ClampTemperature(Forecasts[Day], -40.0, 50.0);

An argument with the same name as its parameter gets no name hint, such as Station.Readings passed to Readings. The last identifier of the argument is compared with the parameter name, case-insensitively; LOwner and AOwner count as different names. The setting is on by default and takes effect once parameter names are switched on.

// Hide matching names on
GetTemperatureRange(Station.Readings, MinTemp, MaxTemp);
Chart := CreateChart(AOwner: LOwner);

// Hide matching names off
GetTemperatureRange(Readings: Station.Readings, MinTemp: MinTemp, MaxTemp: MaxTemp);
Chart := CreateChart(AOwner: LOwner);

A call through an event, a procedural variable or parameter, a TProc<T> variable, an array element of a procedural type or the result of a function call gets the same hints and marks as a direct call. The parameter names are read from the declaration of the procedural type.

if Assigned(FOnChange) then
  FOnChange(Sender: Self);

// Report: TProc<string>
Report(Arg1: Title);