/usr/share/ada/adainclude/gnatprj/sinfo-cn.ads is in libgnatprj6-dev 6.4.0-17ubuntu1.
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The actual contents of the file can be viewed below.
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-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S I N F O . C N --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This child package of Sinfo contains some routines that permit in place
-- alteration of existing tree nodes by changing the value in the Nkind
-- field. Since Nkind functions logically in a manner similar to a variant
-- record discriminant part, such alterations cannot be permitted in a
-- general manner, but in some specific cases, the fields of related nodes
-- have been deliberately laid out in a manner that permits such alteration.
package Sinfo.CN is
procedure Change_Identifier_To_Defining_Identifier (N : in out Node_Id);
-- N must refer to a node of type N_Identifier. This node is modified to
-- be of type N_Defining_Identifier. The scanner always returns identifiers
-- as N_Identifier. The parser then uses this routine to change the node
-- to be a defining identifier where the context demands it. This routine
-- also allocates the necessary extension node. Note that this procedure
-- may (but is not required to) change the Id of the node in question.
procedure Change_Character_Literal_To_Defining_Character_Literal
(N : in out Node_Id);
-- Similar processing for a character literal
procedure Change_Operator_Symbol_To_Defining_Operator_Symbol
(N : in out Node_Id);
-- Similar processing for an operator symbol
procedure Change_Conversion_To_Unchecked (N : Node_Id);
-- Change checked conversion node to unchecked conversion node, clearing
-- irrelevant check flags (other fields in the two nodes are identical)
procedure Change_Operator_Symbol_To_String_Literal (N : Node_Id);
-- The scanner returns any string that looks like an operator symbol as
-- a N_Operator_Symbol node. The parser then uses this procedure to change
-- the node to a normal N_String_Literal node if the context is not one
-- in which an operator symbol is required. There are some cases where the
-- parser cannot tell, in which case this transformation happens later on.
procedure Change_Selected_Component_To_Expanded_Name (N : Node_Id);
-- The parser always generates Selected_Component nodes. The semantics
-- modifies these to Expanded_Name nodes where appropriate. Note that
-- on return the Chars field is set to a copy of the contents of the
-- Chars field of the Selector_Name field.
procedure Change_Name_To_Procedure_Call_Statement (N : Node_Id);
-- Some statements (procedure call statements) are in the form of a name
-- and are parsed as such. This routine takes the scanned name as input
-- and returns the corresponding N_Procedure_Call_Statement.
end Sinfo.CN;
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