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55a402bb75
This patch adds `int line_count` field to `rb_ast_body_t` structure. Instead, we no longer cast `script_lines` to Fixnum. ## Background Ref https://github.com/ruby/ruby/pull/10618 In the PR above, we have decoupled IMEMO from `rb_ast_t`. This means we could lift the five-words-restriction of the structure that forced us to unionize `rb_ast_t *` and `FIXNUM` in one field. ## Relating refactor - Remove the second parameter of `rb_ruby_ast_new()` function ## Attention I will remove a code that assigns -1 to line_count, in `rb_binding_add_dynavars()` of vm.c, because I don't think it is necessary. But I will make another PR for this so that we can atomically revert in case I was wrong (See the comment on the code)