Feature request: Trailing arguments for forall procedure

[x0rb0t]

I propose to add the ability to pass additional arguments to the procedure, which is called in the loop forall, this can save gas on reading repeated data in the procedure. Example:

procedure Procedure(value: ListType, arg1: Type1, arg2: Type2, arg3: Type3)
  (* actions *)
end

transition Transition(list: List ListType)
  arg1 <- state_arg1;
  arg2 <- state_arg2;
  arg3 <- state_arg3;
  forall list Procedure arg1 arg2 arg3
end

[vaivaswatha]

Following up a Telegram conversation, another variant that can be useful is to have an accumulator procedure.

For example: given a list of keys, its values must be fetched from a map field and added up. Right now this can be done using a temporary accumulator field in the procedure used with forall. That's gas expensive though.

@jjcnn

[anton-trunov]

Related issue #577, if we refactor the signature to

procedure Procedure(arg1: Type1, arg2: Type2, arg3: Type3, value: ListType)

[jjcnn]

Closing, since this duplicates #577 .