syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"@variant(mir_basic_block,"}]}
source_snippet:                         @variant(mir_basic_block, Normal) => false,
context_before:                     parse_by_kind!(self, *initializer, _, "basic block declaration",
context_after:                         @variant(mir_basic_block, Cleanup) => true,