syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"tcx.selection_cache.insert("}]}
source_snippet:                 tcx.selection_cache.insert(
context_before:                 // This may overwrite the cache with the same value.
context_after:                     (infcx.typing_env(param_env), pred),