Arrow box in Left side of line numbers

Parag katoch 81 Reputation points
2020-12-22T08:30:28.81+00:00

50315-screenshot-35.png
what is that box for?

C++
C++
A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
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