Crystal: Macros: ending comma incorrectly required in multi-line arguments

[j8r]

This following code fails without a comma after a = 0.
When we add the missing comma, running the formatter crystal tool format removes it (tested in master):

macro test(
  a = 0
)
end

Syntax error in test.cr:2: unexpected token: NEWLINE (expected ',' or ')')

No problems when not setting defaut values for arguments, or all arguments is in one line.

There are two options:

1. keep a similar behavior as def - make macro works without an ending comma.
2. enforce an ending comma

[Sija]

IMO only option no. 1 seems legit.