Metadata from source code coverage analysis and instrumentation.
- ID of a coverage counter. Values ascend from 0.
- ID of a coverage-counter expression. Values ascend from 0.
- Stores per-function coverage information attached to a
mir::Body, to be used in conjunction with the individual coverage statements injected into the function’s basic blocks.
- Enum that can hold a constant zero value, the ID of an physical coverage counter, or the ID of a coverage-counter expression.