syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:         /// what rustc was invoked with, but massaged a bit to agree with
context_before:         /// result of parsing command line options. These are not necessarily
context_after:         /// commands like `--emit llvm-ir` which they're often incompatible with