Fix call-seq deduplicate for name overlap in aliases

lib/rdoc/code_object/any_method.rb

@@ -351,7 +351,6 @@ def deduplicate_call_seq(call_seq)
     return call_seq unless is_alias_for || !aliases.empty?
 
     method_name = self.name
-    method_name = method_name[0, 1] if method_name =~ /\A\[/
 
     entries = call_seq.split "\n"
 
@@ -360,15 +359,24 @@ def deduplicate_call_seq(call_seq)
       ignore << is_alias_for.name
       ignore.concat is_alias_for.aliases.map(&:name)
     end
-    ignore.map! { |n| n =~ /\A\[/ ? /\[.*\]/ : n}
+
     ignore.delete(method_name)
-    ignore = Regexp.union(ignore)
+    ignore_bracket_methods, ignore_other_methods = ignore.partition {|i| i.start_with?('[') }
 
-    matching = entries.reject do |entry|
-      entry =~ /^\w*\.?#{ignore}[$\(\s]/ or
-        entry =~ /\s#{ignore}\s/
+    if ignore_other_methods.any?
+      ignore_union = Regexp.union(ignore_other_methods)
+      entries.reject! do |entry|
+        /\A(?:\w*\.)?#{ignore_union}(?:[(\s]|\z)/.match?(entry) ||
+          /\s#{ignore_union}\s/.match?(entry)
+      end
+    end
+    if ignore_bracket_methods.any?
+      entries.reject! do |entry|
+        # Ignore `receiver[arg] -> return_type` `[](arg)` `[]`
+        /\A\w*\[.*?\](?:[(\s]|\z)/.match?(entry)
+      end
     end
 
-    matching.empty? ? nil : matching.join("\n")
+    entries.empty? ? nil : entries.join("\n")
   end
 end

test/rdoc/parser/c_test.rb

@@ -2107,6 +2107,57 @@ def test_scan_method_copy
     assert_match 'str === obj', equals3.call_seq
   end
 
+  def test_scan_method_copy_bracket_name
+    parser = util_parser <<~C
+      /*
+      *  call-seq:
+      *    obj[index] -> nil
+      *    obj.aref(index) -> nil
+      */
+      static VALUE
+      rb_obj_aref(VALUE obj, VALUE index) { return Qnil; }
+
+      Init_Blah(void)
+      {
+        rb_define_method(rb_cObject, "[]", rb_obj_aref, 1);
+        rb_define_method(rb_cObject, "aref", rb_obj_aref, 1);
+      }
+    C
+
+    parser.scan
+
+    object = @store.classes_hash['Object']
+    bracket_method = object.method_list.find { |m| m.name == '[]' }
+    non_bracket_method = object.method_list.find { |m| m.name == 'aref' }
+    assert_equal 'obj[index] -> nil', bracket_method.call_seq
+    assert_equal 'obj.aref(index) -> nil', non_bracket_method.call_seq
+  end
+
+  def test_scan_method_copy_name_overlap
+    parser = util_parser <<~C
+      /*
+      *  call-seq:
+      *    value?(value) -> true or false
+      *    has_value?(value) -> true or false
+      */
+      static VALUE
+      rb_hash_has_value(VALUE hash, VALUE val) { return Qtrue; }
+      Init_Hash(void)
+      {
+        rb_define_method(rb_cHash, "has_value?", rb_hash_has_value, 1);
+        rb_define_method(rb_cHash, "value?", rb_hash_has_value, 1);
+      }
+    C
+
+    parser.scan
+
+    hash = @store.classes_hash['Hash']
+    value_method = hash.method_list.find { |m| m.name == 'value?' }
+    has_value_method = hash.method_list.find { |m| m.name == 'has_value?' }
+    assert_equal 'value?(value) -> true or false', value_method.call_seq
+    assert_equal 'has_value?(value) -> true or false', has_value_method.call_seq
+  end
+
   def test_scan_order_dependent
     parser = util_parser <<-C
 void a(void) {