[COMMITTED 032/141] gccrs: Make foreverstack debug string const

[arthur . cohen]

From: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>

Those function should not change anything within the foreverstack, it
can therefore be made const.

gcc/rust/ChangeLog:

        * resolve/rust-forever-stack.h: Make debug functions const.
        * resolve/rust-forever-stack.hxx: Likewise.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>
---
 gcc/rust/resolve/rust-forever-stack.h   | 6 +++---
 gcc/rust/resolve/rust-forever-stack.hxx | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/gcc/rust/resolve/rust-forever-stack.h 
b/gcc/rust/resolve/rust-forever-stack.h
index 66e12668f71..661478bab9b 100644
--- a/gcc/rust/resolve/rust-forever-stack.h
+++ b/gcc/rust/resolve/rust-forever-stack.h
@@ -670,7 +670,7 @@ public:
   tl::optional<Rib &> to_rib (NodeId rib_id);
   tl::optional<const Rib &> to_rib (NodeId rib_id) const;
 
-  std::string as_debug_string ();
+  std::string as_debug_string () const;
 
   /**
    * Used to check if a module is a descendant of another module
@@ -752,9 +752,9 @@ private:
   std::reference_wrapper<Node> cursor_reference;
 
   void stream_rib (std::stringstream &stream, const Rib &rib,
-                  const std::string &next, const std::string &next_next);
+                  const std::string &next, const std::string &next_next) const;
   void stream_node (std::stringstream &stream, unsigned indentation,
-                   const Node &node);
+                   const Node &node) const;
 
   /* Helper types and functions for `resolve_path` */
 
diff --git a/gcc/rust/resolve/rust-forever-stack.hxx 
b/gcc/rust/resolve/rust-forever-stack.hxx
index d3d78894671..1c83f6bda61 100644
--- a/gcc/rust/resolve/rust-forever-stack.hxx
+++ b/gcc/rust/resolve/rust-forever-stack.hxx
@@ -699,7 +699,7 @@ template <Namespace N>
 void
 ForeverStack<N>::stream_rib (std::stringstream &stream, const Rib &rib,
                             const std::string &next,
-                            const std::string &next_next)
+                            const std::string &next_next) const
 {
   if (rib.get_values ().empty ())
     {
@@ -718,7 +718,7 @@ ForeverStack<N>::stream_rib (std::stringstream &stream, 
const Rib &rib,
 template <Namespace N>
 void
 ForeverStack<N>::stream_node (std::stringstream &stream, unsigned indentation,
-                             const ForeverStack<N>::Node &node)
+                             const ForeverStack<N>::Node &node) const
 {
   auto indent = std::string (indentation, ' ');
   auto next = std::string (indentation + 4, ' ');
@@ -750,7 +750,7 @@ ForeverStack<N>::stream_node (std::stringstream &stream, 
unsigned indentation,
 
 template <Namespace N>
 std::string
-ForeverStack<N>::as_debug_string ()
+ForeverStack<N>::as_debug_string () const
 {
   std::stringstream stream;
 
-- 
2.45.2