What is GroupScope?

Question

In all of the coq codes in ssreflect there is this statement

Import GroupScope.

What is GroupScope? If it is another file, where can I download it from?

Answer 1

GroupScope is a module defined in the fingroup module of the MathComp library (formerly, a part of SSR). It is defined as follows:

Module GroupScope.
Open Scope group_scope.
End GroupScope.

Thus, importing GroupScope has the effect of making all notations in group_scope available to the current file, with one small difference, as explained in the source code:

This module can be imported to open the scope for group element operations locally to a file, without exporing the Open to clients of that file (as Open would do).