syntax_data: {"ast_node_type":"function","tokens":[{"end":40,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn allows_unsafe(self) -> bool {
context_before:     /// (that is, a macro marked with `#[allow_internal_unsafe]`).
context_after:         self.ctxt().outer_expn_data().allow_internal_unsafe