syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:         /// commands like `--emit llvm-ir` which they're often incompatible with
context_before:         /// what rustc was invoked with, but massaged a bit to agree with
context_after:         /// if we otherwise use the defaults of rustc.