Formatting ``` module Make_contract_fields (Gd : Grid_display.GRID_DISPLAY) (_ : CONTRACT_ROW_DATA with type t = Gd.row_data and type row_id = Gd.row_id) : sig end ``` with the options ``` margin=100 profile=conventional field-space=tight-decl indicate-multiline-delimiters=closing-on-separate-line ``` introduces a trailing space after `sig`.