syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // not strictly necessary but *shrug*
context_before:             // a `ReEarlyParam` named `'erased`. Technically that would print as `'erased/#IDX` so this is
context_after:             ReErased => f.write_str("'{erased}"),