syntax_data: {"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if let Some((first, second)) = sess.opts.unstable_opts.sanitizer.mutually_exclusive() {
context_before:     // Cannot mix and match mutually-exclusive sanitizers.
context_after:         sess.dcx().emit_err(errors::CannotMixAndMatchSanitizers {