\_name> is already a global var when you attempt
to redefine a global variable, see debug\_mode
(§6.6.4 page 
).
\_name> is already a global var with different
definition when you attempt to redefine a global variable with a new
type or new dimension(s).
\_name> already defined (global var) when you
reuse a global variable name as a function name, definition or
declaration.
\_name> already defined when you attempt to
redefine a function, see debug\_mode (§6.6.4 page ) and
remove\_function\_definition
(§6.6.4 page ).
\_name> already defined with different return
type when you redefine a function and change the return value type.
\_name> already declared with different
profile when you redefine a function and change the number or the type
of its arguments.
\_name> is built-in, you cannot redefine it