using void loop(){} in .ino file generates: error: redefinition of 'void loop()'

[jantje]

Any empty method declared with {} in a .ino file will generated a redefinition error.
The root cause is that the ino to cpp converter expects at least 1 character between '{' and '}'
The work around is to use
void loop(){ }

[jantje]

FYI
I could never notice this issue as I use the formatter

and have CDT format the files on each save.

I had to turn these off to reproduce the issue.