syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"branch_protection:"}]}
source_snippet:     branch_protection: Option<BranchProtection> = (None, parse_branch_protection, [TRACKED],
context_before:         "emit noalias metadata for box (default: yes)"),
context_after:         "set options for branch target identification and pointer authentication on AArch64"),