Skip null check for brace_block
brace_block
brace_block is '{' brace_body '}' or k_do do_body k_end. Both of them are not null so no need to check $5.
'{' brace_body '}'
k_do do_body k_end
$5
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Skip null check for
brace_blockbrace_blockis'{' brace_body '}'ork_do do_body k_end.Both of them are not null so no need to check
$5.