This was discussed at length on the Arduino developers mailing list years ago and final conclusion is that it must be a macro. The reason is that some boards have a builtin led and some don't. The ...
In file included from C:\Users\Pritam Bakshi\AppData\Local\Temp.arduinoIDE-unsaved20221017-6100-19mu1zx.fx4yl\sketch_nov17b\sketch_nov17b.ino:24:0: c:\Users\Pritam ...
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