syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:         /// Basically anything but `ReBound` and `ReErased`.
context_before:         /// Does this have any region that "appears free" in the type?
context_after:         const HAS_FREE_REGIONS            = 1 << 16;