syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"BytePos(file.start_pos.0"}]}
source_snippet:                 BytePos(file.start_pos.0 + file.source_len.0),
context_before:                 file.start_pos,
context_after:                 SyntaxContext::root(),