All functions,subs and methods, and control structures are blocks. Any entity defined within these is invisible to the outside. You can also define a scope explicitly.
scope(
....
...
)
The work 'block' may also be used. Or even a left bracket on its own.
I found #case capital to be most useful. Capitalised equates and types seem to be common practice in C, to distinguish from other entities of the same name.
Charles