syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Niche: if `fixed-x18`, or effectively switching on `reserved-x18` flag, is enabled
context_before:     let mut unsupported_sanitizers = sess.opts.unstable_opts.sanitizer - supported_sanitizers;
context_after:     // we should allow Shadow Call Stack sanitizer.