abstract is a built-in keyword in MQL5 (as in C++ and other programming languages as well) - you can't use it as a name for a macro or whatever else.
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I was wondering, that macros sometimes dont appear in their correct color, so that one can see: This is a macro.
And I figured out.
Example:
There is a macro named "abstract" which I use ... the sense is not important here.
The macro is defined in a file in Line number #37
When I use this macro now in another file, it will only appear colored when the line - where the macro is used - is equal or higher than 37.
Please see for yourself:

... and after inserting two empty lines above:
WTF! :D