syntax_data: {"ast_node_type":"function","tokens":[{"end":30,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet: fn build_scope_drops<'tcx, F>(
context_before: /// * `arg_count`, number of MIR local variables corresponding to fn arguments (used to assert that we don't drop those)
context_after:     cfg: &mut CFG<'tcx>,