Can you reproduce it?
Should I somehow contact @suda or will he see these posts?
Thanks!
Yes, my Web IDE behaves just the same.
By using the notation @userName he’ll already get a notification that his name was mentioned.
It looks like a bug in our Arduino Wiring preprocessor. You can disable it by adding:
#pragma SPARK_NO_PREPROCESSOR
in the beginning of the file (you can have newlines before it ;)).
Thanks, suda! Is there no negative side effect if I add this?
Why is this happening only with the OneWire library?
Side effects are, that you have to add #include "application.h" to your .INO file (but this might come with any of your other #include statements already).
And you need to add function prototypes if you aren’t already declaring your functions before their first calling statement.
Otherwise no.
I do the above anyway 
Thank you!
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