syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"`instructions:u`"}]}
source_snippet:         `instructions:u` (retired instructions, userspace-only)
context_before:         `wall-time` (monotonic clock, i.e. `std::time::Instant`)
context_after:         `instructions-minus-irqs:u` (subtracting hardware interrupt counts for extra accuracy)"