Comment by smlckz | Hacker News Reader

Comment by smlckz | Hacker News Reader

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>> In design - not just programming language design - constraints are generally a good thing.

The best example of that in programming language design I have seen is the V programming language. (https://vlang.io)

No global variables, no null/undefined/nil/None/... V is the only language I know in which variable shadowing is an error. (Do you know any other language with this feature/constraint?)

And then I remember the handling of ''var''s in js and hoisting etc. ... sigh!

> Do you know any other language with this feature/constraint

   gcc -Werror=shadow

Demo:

  $ gcc -Werror=shadow -x c -
  void foo(int x) { { int x; } }
  [Ctrl-D][Enter]
  <stdin>: In function ‘foo’:
  <stdin>:1:25: error: declaration of ‘x’ shadows a parameter [-Werror=shadow]
  <stdin>:1:14: note: shadowed declaration is here
  cc1: some warnings being treated as errors

Ah! Good old C.

I did not dare to open the gcc man page, now I think I will look at it.

For that constraint, one have to pass an option. I want to know if any language (other than V) which has this as default.

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