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- An identifier has file scope if its declaration appears outside
- of all blocks and classes. An identifier with file scope is
- visible from the point where it is declared to the end of the
- source file. Such an identifier is also accessible for the
- initialization of global variables. If an identifier is declared
- extern, it is also visible, at linkage time, in all object files
- being linked. Global identifiers are identifiers declared
- with file scope.
-