Eberon syntax relaxations

Here are additions to orginal oberon grammar to make it less strict in some cases.

Optional procedure identifier at the end

Example:

PROCEDURE p; END; (* 'p' is note required before 'END' *)

Pocedure name duplicating at the end is useless in case of small procedures. So it is optional in Eberon.

Extra semicolon can be used in record last field declaration

Example:

TYPE 
    T = RECORD 
        field1: INTEGER; 
        field2: INTEGER; 
        fieldn: INTEGER; (* semocolon is allowed here in Eberon, prohibited by original oberon grammar *)
    END;

Although this semicolon is "extra" from grammar standpoint it just inconvenient from editing/merge standpoint. So Eberon allows to have it.

Extra semicolon can be used after RETURN

Example:

PROCEDURE p(): INTEGER; 
    RETURN 0; (* semocolon is allowed here in Eberon, prohibited by original oberon grammar *)
END;

Although RETURN is not a statement from oberon grammar standpoint (it is a part of procedure declaration) it still looks and feels like a statement. So Eberon allows to have extra semicolon after it.