Introduce NODE_FILE

`__FILE__` was managed by `NODE_STR` with `String` object.
This commit introduces `NODE_FILE` and `struct rb_parser_string` so that

1. `__FILE__` is detectable from AST Node
2. Reduce dependency ruby object

1 files changed, 2 insertions, 0 deletions

diff --git a/ast.c b/ast.c
index 33b2f61aa2..6c3b2bf04c 100644
--- a/ast.c
+++ b/ast.c
@@ -694,6 +694,8 @@ node_children(rb_ast_t *ast, const NODE *node)
         }
       case NODE_LINE:
         return rb_ary_new_from_args(1, rb_node_line_lineno_val(node));
+      case NODE_FILE:
+        return rb_ary_new_from_args(1, rb_node_file_path_val(node));
       case NODE_ERROR:
         return rb_ary_new_from_node_args(ast, 0);
       case NODE_ARGS_AUX: