syntax_data: {"ast_node_type":"other","tokens":[{"end":20,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:             } else {
context_before:                 dcx.emit_err(InvalidNumLiteralBasePrefix { span, fixed })
context_after:                 dcx.emit_err(InvalidNumLiteralSuffix { span, suffix: suf.to_string() })