[ruby/rdoc] Fix full name of known class

Properly set the name of `File::Constants`, which is the only name
with a namespace in `RDoc::KNOWN_CLASSES`, and fixes longstanding bug
that `File::Constants` becomes `File::File::Constants`.

When it is generated by `rb_file_const` in dir.c, `name` is set to the
qualified name as same as `full_name`, and generated in the normal way
in file.c later, already set `full_name` is cleared and `name` will be
constructed from the enclosing namespace and the `name`.  It will
results in duplicated namespace, `File::File::Constants`.

https://github.com/ruby/rdoc/commit/3a8d6df562

1 files changed, 11 insertions, 0 deletions

diff --git a/test/rdoc/test_rdoc_parser_c.rb b/test/rdoc/test_rdoc_parser_c.rb
index 3383cb6826..d3138d23aa 100644
--- a/test/rdoc/test_rdoc_parser_c.rb
+++ b/test/rdoc/test_rdoc_parser_c.rb
@@ -638,6 +638,17 @@ void Init_File(void) {
     assert_equal 'LOCK_SH',          constant.name
     assert_equal 'INT2FIX(LOCK_SH)', constant.value
     assert_equal 'Shared lock',      constant.comment.text
+
+    @parser = util_parser <<-EOF
+void Init_File(void) {
+  rb_cFile = rb_define_class("File", rb_cIO);
+  rb_mFConst = rb_define_module_under(rb_cFile, "Constants");
+}
+    EOF
+    @parser.do_classes_and_modules
+    @parser.do_constants
+
+    assert_equal 'File::Constants',  klass.full_name
   end
 
   def test_do_includes