gccrs: Do not warn about unused `self` parameter

gcc/rust/ChangeLog:

	* checks/lints/rust-lint-unused-var.cc (check_decl):
	Do not warn about unused `self` parameter.

Signed-off-by: Ryutaro Okada <1015ryu88@gmail.com>

diff --git a/gcc/rust/checks/lints/rust-lint-unused-var.cc b/gcc/rust/checks/lints/rust-lint-unused-var.cc
index 896eeb01c626059bc855a9d97f590f9416045a8f..08596f1745a389b9b2026e8696c630069bfe0356 100644 (file)
--- a/gcc/rust/checks/lints/rust-lint-unused-var.cc
+++ b/gcc/rust/checks/lints/rust-lint-unused-var.cc
@@ -31,6 +31,7 @@ check_decl (tree *t)
   tree var_name = DECL_NAME (*t);
   const char *var_name_ptr = IDENTIFIER_POINTER (var_name);
   bool starts_with_under_score = strncmp (var_name_ptr, "_", 1) == 0;
+  bool is_self = strcmp (var_name_ptr, "self") == 0;
 
   bool is_constant = TREE_CODE (*t) == CONST_DECL;
   // if (!is_constant)
@@ -43,7 +44,8 @@ check_decl (tree *t)
   //             starts_with_under_score ? "true" : "false", var_name_ptr);
   //   }
 
-  if (!TREE_USED (*t) && !DECL_ARTIFICIAL (*t) && !starts_with_under_score)
+  if (!TREE_USED (*t) && !DECL_ARTIFICIAL (*t) && !starts_with_under_score
+      && !is_self)
     {
       warning_at (DECL_SOURCE_LOCATION (*t),
                  is_constant ? OPT_Wunused_const_variable_