In for loop _ is accessible

[beef331]

Unlike pretty much anywhere else _ is accessible as a single parameter in a for loop.

Example

for _ in ["a"]:
  echo _

Current Output

a

Expected Output

Error: undeclared identifier: '_'

Tested on pretty much all Nim versions.

[disruptek]

Feature.

[timotheecour]

Feature.

agreed; but should be documented (maybe it is, haven't found it)

[beef331]

@timotheecour why is this a feature, does it not defeat the purpose of _ being an unused value, which is consistent for for _, _ ..., tuple unpacking, and variable declaration?

[timotheecour]

my bad, i misread accessible as inaccessible.
you're right, this should give Error: undeclared identifier: '_' in top post.

when true:
  let (_, a, _) = (1,2,3)
  echo _ # Error: undeclared identifier: '_'
when true:
  let _ = 1
  echo _ # Error: undeclared identifier: '_'

[beef331]

Ah, thanks. Thought I was losing my mind after both you and disruptek said it's a feature.

[ringabout]

How about this?

block _:
  echo "123"
  break _

I would expect this to error too.

Error: undeclared identifier: '_'