Lexer: Mismatched indentation in arrays and parameter lists should be disallowed

[xixixao]

fn a,
  fn
    b
  fn
    c
# and
[
  a
  fn
    b
  c
]

should throw indentation error. Why is this allowed?

[satyr]

Mainly to permit:

[ a
  b
  c ]

[xixixao]

That still follows that the 3rd item has the same indent as the 2nd.

[xixixao]

I don't really know into which issue this belongs, but the indentation rules seem waaaaay to lenient:

if a
    b
  c
# if (a) {
#   b;
# }
# c;

[GeoffreyBooth]

For the sake of backward compatibility, I don’t think we’re changing this now.