syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"\"argument"}]}
source_snippet:             "argument to `unpretty` must be one of `normal`, `identified`, \
context_before:         name => early_dcx.early_fatal(format!(
context_after:                             `expanded`, `expanded,identified`, `expanded,hygiene`, \