syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // we should allow Shadow Call Stack sanitizer.
context_before:     // Niche: if `fixed-x18`, or effectively switching on `reserved-x18` flag, is enabled
context_after:     if sess.opts.unstable_opts.fixed_x18 && sess.target.arch == "aarch64" {