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The body of a function or procedure often begins with declarations of local variables used in the routine's statement block. These declarations can also include constants, types, and other routines. The scope of a local identifier is limited to the routine where it is declared.
Nested routines
Functions and procedures sometimes contain other functions and procedures within the local-declarations section of their blocks. For example, the following declaration of a procedure called DoSomething contains a nested procedure.
procedure DoSomething(S: string);
var
X, Y: Integer;
procedure NestedProc(S: string);
begin
...
end;
begin
...
NestedProc(S);
...
end;
The scope of a nested routine is limited to the procedure or function in which it is declared. In our example, NestedProc can be called only within DoSomething.