syntax_data: {"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut unsupported_sanitizers = sess.opts.unstable_opts.sanitizer - supported_sanitizers;
context_before:     let supported_sanitizers = sess.target.options.supported_sanitizers;
context_after:     // Niche: if `fixed-x18`, or effectively switching on `reserved-x18` flag, is enabled