pub fn coverage_report(
program: &MirProgram,
emit_ctx: &MirEmitCtx<'_>,
) -> CoverageReportExpand description
Walk every fn in program and report walker reach. For each
fn, calls [emit_mir_expr] on the body and counts
Some / None. Suitable for --explain-mir-coverage–style
diagnostics; the codegen path itself is untouched.