syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"8"}]}
source_snippet:             8 => dcx.emit_err(OctalFloatLiteralNotSupported { span }),
context_before:             16 => dcx.emit_err(HexadecimalFloatLiteralNotSupported { span }),
context_after:             2 => dcx.emit_err(BinaryFloatLiteralNotSupported { span }),