[ruby-dev:39400] [Feature:1.9] improvement of method redefinition warning

なかだです。

メソッド再定義で警告を出すときに、上書きされるほうの定義の場所も
出してはどうでしょうか。


Index: proc.c
===================================================================
--- proc.c	(revision 25152)
+++ proc.c	(working copy)
@@ -649,6 +649,8 @@ rb_proc_arity(VALUE self)
 }
 
-static rb_iseq_t *
-get_proc_iseq(VALUE self, int *is_proc)
+#define get_proc_iseq rb_proc_get_iseq
+
+rb_iseq_t *
+rb_proc_get_iseq(VALUE self, int *is_proc)
 {
     rb_proc_t *proc;
Index: vm_method.c
===================================================================
--- vm_method.c	(revision 25152)
+++ vm_method.c	(working copy)
@@ -189,5 +189,24 @@ rb_add_method_def(VALUE klass, ID mid, r
 	    old_def->type != VM_METHOD_TYPE_UNDEF &&
 	    old_def->type != VM_METHOD_TYPE_ZSUPER) {
+	    extern rb_iseq_t *rb_proc_get_iseq(VALUE proc, int *is_proc);
+	    rb_iseq_t *iseq = 0;
+
 	    rb_warning("method redefined; discarding old %s", rb_id2name(mid));
+	    switch (old_def->type) {
+	      case VM_METHOD_TYPE_ISEQ:
+		iseq = old_def->body.iseq;
+		break;
+	      case VM_METHOD_TYPE_BMETHOD:
+		iseq = rb_proc_get_iseq(old_def->body.proc, 0);
+		break;
+	      default:
+		break;
+	    }
+	    if (iseq && !NIL_P(iseq->filename)) {
+		int line = iseq->insn_info_table ? rb_iseq_first_lineno(iseq) : 0;
+		rb_compile_warning(RSTRING_PTR(iseq->filename), line,
+				   "previous definition of %s was here",
+				   rb_id2name(old_def->original_id));
+	    }
 	}
 	rb_free_method_entry(old_me);
Index: test/ruby/test_class.rb
===================================================================
--- test/ruby/test_class.rb	(revision 25152)
+++ test/ruby/test_class.rb	(working copy)
@@ -115,4 +115,5 @@ class TestClass < Test::Unit::TestCase
     end
     assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
+    assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)
 
     stderr = EnvUtil.verbose_warning do
@@ -142,4 +143,5 @@ class TestClass < Test::Unit::TestCase
     end
     assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
+    assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)
 
     stderr = EnvUtil.verbose_warning do
Index: test/ruby/test_module.rb
===================================================================
--- test/ruby/test_module.rb	(revision 25152)
+++ test/ruby/test_module.rb	(working copy)
@@ -797,4 +797,5 @@ class TestModule < Test::Unit::TestCase
     end
     assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
+    assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)
 
     stderr = EnvUtil.verbose_warning do
@@ -824,4 +825,5 @@ class TestModule < Test::Unit::TestCase
     end
     assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
+    assert_match(/:#{line-1}: warning: previous definition of foo/, stderr)
 
     stderr = EnvUtil.verbose_warning do


-- 
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
    中田 伸悦