Struct FileCoverage 

pub struct FileCoverage {
    pub lines: BTreeMap<u32, u64>,
}

Per-file coverage, indexed by line number.

Only lines that appear in a DA record are tracked — these are the “executable” lines per LLVM’s coverage mapping. Blank lines, comments, and purely declarative lines (use statements, struct definitions) do not appear here, and we treat them as “not applicable” rather than “uncovered”.

Fields

lines: BTreeMap<u32, u64>

Line number (1-indexed) → hit count.

Implementations

impl FileCoverage

pub fn merge_from(&mut self, other: &FileCoverage)

Fold another file’s line data into this one: union of lines, per-line saturating sum of hit counts (spec 26).

This is the aggregation lcov -a performs, so multi-leg reports pre-merged by lcov and raw aliased reports converge to the same data.

pub fn coverage_in_span(&self, start: usize, end: usize) -> f64

Percentage of executable lines in [start..=end] that were hit at least once.

Returns 100.0 if no executable lines fall inside the span. A function composed entirely of declarative code (fn sig() -> Type;, unreachable macro expansions, etc.) genuinely has nothing to cover and should not be penalized.

Trait Implementations

impl Clone for FileCoverage

fn clone(&self) -> FileCoverage

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FileCoverage

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for FileCoverage

fn default() -> FileCoverage

Returns the “default value” for a type.