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if-blocks (and other flow control blocks) always override $args with an empty list #397

xiaq opened this issue Jul 7, 2017 · 0 comments


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xiaq commented Jul 7, 2017

The fact that if-blocks and other control flow blocks are full lambdas mean that they also have an argument list. However, they never get any arguments, which is a bit useless and annoying:

fn f {
  if (= (count $args) 2) {
    # doesn't work, since $args is not the arguments to f
    put $args[1]

There are several possible solutions:

  • Document and live with this.

  • Introduce a special "flavor" of lambda for flow control blocks that don't have $args.

  • Remove support for $args because implicit things are confusing. This also means that variables like $0, $1, ... are also lost.

    Alternatively, come up with a restricted design for $args that is useful is simple cases, but doesn't get confusing in more complex cases.

@xiaq xiaq added this to the 0.10 milestone Jul 8, 2017
@xiaq xiaq closed this as completed in 01220cf Aug 5, 2017
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