syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"2"}]}
source_snippet:                         2 => fn_abi.ret.cast_to(Reg::i16()),
context_before:                         1 => fn_abi.ret.cast_to(Reg::i8()),
context_after:                         4 => fn_abi.ret.cast_to(Reg::i32()),