Inno Setup: How to watch variables values or write to debug output?

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There’s currently no debug watch window, but you can simply hover the variable you want to inspect, when the debugger is stopped on a breakpoint. To print something to a debug output, use the Log procedure:

procedure InitializeWizard;
var
  Value: Integer;
begin
  Value := 123;
  Log('The Value is: ' + IntToStr(Value));
end;

Here is the result of the hovered Value variable from the previous script sample:

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And the result of the debug output window after when you step over the Log statement:

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