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I do not get this error in Arduino IDE 1.8.5 with snippet you provided, but I get it in Sloeber Eclipse plugin. The later attached sketch fails to compile in Arduino IDE 1.8.5 too.

The error is in Arduino build chain ino to cpp conversion for the C++ compilation. Put the typedef declaration into .h file and include it in ino.

I do not get this error in Arduino IDE 1.8.5 with snippet you provided, but I get it in Sloeber Eclipse plugin. The later attached sketch fails to compile in Arduino IDE 1.8.5 too.

The error is in Arduino build chain ino to cpp conversion for the C++ compilation. Put the typedef declaration into .h file and include it in ino.

EDIT: Details are in my newer answer to a similar problem.

I do not get this error in Arduino IDE 1.8.5 (but in Sloeber Eclipse plugin). You use older Arduino IDE 1.8.3.

The error is in older Arduino build chain ino to cpp conversion for the C++ compilation. Use latest IDE version or put the typedef declaration into .h file and include it in ino.

I do not get this error in Arduino IDE 1.8.5 with snippet you provided, but I get it in Sloeber Eclipse plugin. The later attached sketch fails to compile in Arduino IDE 1.8.5 too.

The error is in Arduino build chain ino to cpp conversion for the C++ compilation. Put the typedef declaration into .h file and include it in ino.

I do not get this error in Arduino IDE 1.8.5, only in Sloeber Eclipse plugin. You use Arduino IDE 1.8.3.

The error is in older Arduino build chain ino to cpp conversion for the C++ compilation. Use latest IDE version or put the typedef declaration into .h file and include it in ino.

I do not get this error in Arduino IDE 1.8.5 (but in Sloeber Eclipse plugin). You use older Arduino IDE 1.8.3.

The error is in older Arduino build chain ino to cpp conversion for the C++ compilation. Use latest IDE version or put the typedef declaration into .h file and include it in ino.