[gcc r13-6243] gccrs: ast: Dump no comma after self in fn params if it is the last one

[Arthur Cohen <cohenarthur@gcc.gnu.org>]

https://gcc.gnu.org/g:567494f7030b45e79b33ab38ba769826e370280e

commit r13-6243-g567494f7030b45e79b33ab38ba769826e370280e
Author: Jakub Dupak <dev@jakubdupak.com>
Date:   Wed Nov 16 14:16:51 2022 +0100

    gccrs: ast: Dump no comma after self in fn params if it is the last one
    
    gcc/rust/ChangeLog:
    
            * ast/rust-ast-dump.cc (Dump::visit): Fix dumping of fn params.
    
    Signed-off-by: Jakub Dupak <dev@jakubdupak.com>

Diff:
---
 gcc/rust/ast/rust-ast-dump.cc | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/gcc/rust/ast/rust-ast-dump.cc b/gcc/rust/ast/rust-ast-dump.cc
index 9ec847c4f88..131e23ea180 100644
--- a/gcc/rust/ast/rust-ast-dump.cc
+++ b/gcc/rust/ast/rust-ast-dump.cc
@@ -1077,8 +1077,12 @@ Dump::visit (Method &method)
   visit (method.get_visibility ());
   stream << "fn " << method.get_method_name () << '(';
 
-  stream << method.get_self_param ().as_string () << ", ";
-  visit_items_joined_by_separator (method.get_function_params (), ", ");
+  stream << method.get_self_param ().as_string ();
+  if (!method.get_function_params ().empty ())
+    {
+      stream << ", ";
+      visit_items_joined_by_separator (method.get_function_params (), ", ");
+    }
 
   stream << ") ";
 
@@ -1343,9 +1347,13 @@ Dump::visit (TraitItemMethod &item)
   // emit_visibility (method.get_visibility ());
   stream << "fn " << method.get_identifier () << '(';
 
-  stream << method.get_self_param ().as_string () << ", ";
+  stream << method.get_self_param ().as_string ();
 
-  visit_items_joined_by_separator (method.get_function_params (), ", ");
+  if (!method.get_function_params ().empty ())
+    {
+      stream << ", ";
+      visit_items_joined_by_separator (method.get_function_params (), ", ");
+    }
 
   stream << ") ";