implement RFC-402

[slangmgh]

nim-lang/RFCs#402

[slangmgh]

The error msg is not matched with the previous behaviour.
So the tsigmatch.nim check failed.

[timotheecour]

can the last param be checked specially so that we allow optional params with an untyped body:

when defined case6:
  template fn(a = 1, b = 2, body) = discard

  fn(1, 2):
    foo1
    foo2

  fn(1): # bug: doesn't work
    foo1
    foo2

[timotheecour]

please add tests to ensure this works and at least doesnt' introduce regressions

things to consider:

• varags[int]
• varags[untyped]
• optional params
  etc

[slangmgh]

can the last param be checked specially so that we allow optional params with an untyped body:

when defined case6:
  template fn(a = 1, b = 2, body) = discard

  fn(1, 2):
    foo1
    foo2

  fn(1): # bug: doesn't work
    foo1
    foo2

You can define another overloaded template or using macro with varargs[untyped].

[solo989]

Making default arguments work with untyped bodies sounds like it should be part of a completely seperate RFC.

Possibly combined with named only arguments support as a pragma or a new postfix operator so it doesn't break existing code.

[metagn]

Is there anything to do here besides test for varargs[untyped]?

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. If you think it is still a valid PR, please rebase it on the latest devel; otherwise it will be closed. Thank you for your contributions.