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lines changed Original file line number Diff line number Diff line change @@ -361,11 +361,16 @@ pub enum StatementKind<'tcx> {
361361 /// Disallowed after drop elaboration.
362362 AscribeUserType ( Box < ( Place < ' tcx > , UserTypeProjection ) > , ty:: Variance ) ,
363363
364- /// Marks the start of a "coverage region", injected with '-Cinstrument-coverage'. A
365- /// `Coverage` statement carries metadata about the coverage region, used to inject a coverage
366- /// map into the binary. If `Coverage::kind` is a `Counter`, the statement also generates
367- /// executable code, to increment a counter variable at runtime, each time the code region is
368- /// executed.
364+ /// Carries control-flow-sensitive information injected by `-Cinstrument-coverage`,
365+ /// such as where to generate physical coverage-counter-increments during codegen.
366+ ///
367+ /// Coverage statements are used in conjunction with the coverage mappings and other
368+ /// information stored in the function's
369+ /// [`mir::Body::function_coverage_info`](crate::mir::Body::function_coverage_info).
370+ /// (For inlined MIR, take care to look up the *original function's* coverage info.)
371+ ///
372+ /// Interpreters and codegen backends that don't support coverage instrumentation
373+ /// can usually treat this as a no-op.
369374 Coverage ( Box < Coverage > ) ,
370375
371376 /// Denotes a call to an intrinsic that does not require an unwind path and always returns.
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