syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"2"}]}
source_snippet:             2 => dcx.emit_err(BinaryFloatLiteralNotSupported { span }),
context_before:             8 => dcx.emit_err(OctalFloatLiteralNotSupported { span }),
context_after:             _ => unreachable!(),