Variable redeclaration warning/error

[vtereshkov]

Variable redeclaration warning/error

[vtereshkov]

@marekmaskarinec I think this is a direct consequence of the conventional scope rules. The variable i in somefunc is local, while in main it is global. Does Go behave differently?

[marekmaskarinec]

To my suprise, go behaves the same, although I think it shouldn't. Redeclaration of a variable like this:

i := 3
i := 2

causes an error like this: no new variables on left side of := (in go).

The case shown earlier is a redeclaration of a variable too. On the other hand, I can see some use cases to a global variable not being forced. It think, this is a good case for a warning.

[vtereshkov]

Some languages like V disallow shadowing global variables with local ones, though most historically important languages, including C, allow this without a warning.

Moreover, warnings in interpreted languages are very rarely used, since they would be displayed again and again each time the user runs the program. It should be either an error or nothing.

[marekmaskarinec]

Ok. I can see some reasons, you would want to overwrite a global variable. I was just confused.