[antlr-interest] Newbie - rule help

[Nico]

Hi all. I don't have this rule very clear.
Can anyone help me telling in detail what the code in braces does?

modifiers
 : ( modifier )*
  {#modifiers = #([MODIFIERS, "MODIFIERS"], #modifiers);}
 ;

I have confusion because I have also found same rule like this

modifiers
 : ( modifier )*
  {#modifiers = #(#[MODIFIERS, "MODIFIERS"], #modifiers);}
 ;

With an extra # before  [MODIFIERS

regards
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