[TCLCORE] TIP #184: Avoid Creating Unusable Variables

[Larry S. <la...@wi...>]

>  One example is: 
> 
>       upvar 0 x(1) y(1)
> 
>  which creates a /scalar/ variable named y(1) that is linked to the 
>  element 1 of the array x. However, there is no way for a tcl script to 
>  read or write such scalar variables, the parser will interpret that 
>  name as referring to an element of the array named y. 

% global x(1)
% set {x(1)} foo
foo
% puts ${x(1)}
foo



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