syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"16"}]}
source_snippet:             16 => dcx.emit_err(HexadecimalFloatLiteralNotSupported { span }),
context_before:         LitError::NonDecimalFloat(base) => match base {
context_after:             8 => dcx.emit_err(OctalFloatLiteralNotSupported { span }),