Specify int bitfield as signed int bitfield

sunc treats int bitfield as unsigned int.
This commit will fix build failure on sunc.

* http://rubyci.s3.amazonaws.com/solaris10-sunc/ruby-master/log/20230617T100003Z.fail.html.gz
* http://rubyci.s3.amazonaws.com/solaris11-sunc/ruby-master/log/20230617T090011Z.fail.html.gz

1 files changed, 2 insertions, 2 deletions

diff --git a/rubyparser.h b/rubyparser.h
index ab70176fc4..5fbc1de340 100644
--- a/rubyparser.h
+++ b/rubyparser.h
@@ -313,8 +313,8 @@ typedef struct rb_ast_body_struct {
     // script_lines is either:
     // - a Fixnum that represents the line count of the original source, or
     // - an Array that contains the lines of the original source
-    int frozen_string_literal:2; /* -1: not specified, 0: false, 1: true */
-    int coverage_enabled:2; /* -1: not specified, 0: false, 1: true */
+    signed int frozen_string_literal:2; /* -1: not specified, 0: false, 1: true */
+    signed int coverage_enabled:2; /* -1: not specified, 0: false, 1: true */
 } rb_ast_body_t;
 typedef struct rb_ast_struct {
     VALUE flags;