syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"fluent::mir_build_unreachable_making_this_unreachable_n_more,"}]}
source_snippet:                     fluent::mir_build_unreachable_making_this_unreachable_n_more,
context_before:                     pat_span,
context_after:                 );