syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"dropless_arena:"}]}
source_snippet:     dropless_arena: &'p DroplessArena,
context_before:     pattern_arena: &'p TypedArena<DeconstructedPat<'p, 'tcx>>,
context_after:     /// Tracks if we encountered an error while checking this body. That the first function to