syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"\"either"}]}
source_snippet:         "either a boolean (`yes`, `no`, `on`, `off`, etc), or `nll` (default: `nll`)";
context_before:     pub(crate) const parse_mir_include_spans: &str =
context_after:     pub(crate) const parse_align: &str = "a number that is a power of 2 between 1 and 2^29";