syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"`expanded`,"}]}
source_snippet:                             `expanded`, `expanded,identified`, `expanded,hygiene`, \
context_before:             "argument to `unpretty` must be one of `normal`, `identified`, \
context_after:                             `ast-tree`, `ast-tree,expanded`, `hir`, `hir,identified`, \