Function resolveMatrixRefs

variables.go:457–487

resolveMatrixRefs resolves any `ref:` rows in matrix and returns a new Matrix with those rows populated. It must not mutate the matrix passed in: that matrix is part of the shared, cached Task AST, and concurrent invocations of the same task (e.g. via parallel deps) call this with the same *ast.Matr

(matrix *ast.Matrix, cache *templater.Cache)

// below, intermittently leaking a value resolved for one caller into another
// caller's expansion. See #2890.
func resolveMatrixRefs(matrix *ast.Matrix, cache *templater.Cache) (*ast.Matrix, error) {
	if matrix.Len() == 0 {
		return matrix, nil
	}
	hasRef := false
	for _, row := range matrix.All() {
		if row.Ref != "" {
			hasRef = true
			break
		}
	}
	if !hasRef {
		return matrix, nil
	}
	resolved := matrix.DeepCopy()
	for _, row := range resolved.All() {
		if row.Ref != "" {
			v := templater.ResolveRef(row.Ref, cache)
			if cache.Err() != nil {
				return nil, cache.Err()
			}
			switch value := v.(type) {
			case []any:
				row.Value = value
			default:
				return nil, fmt.Errorf("matrix reference %q must resolve to a list", row.Ref)
			}
		}
	}
	return resolved, nil
}

func resolveEnumRefs(requires *ast.Requires, cache *templater.Cache) error {
	if requires == nil || len(requires.Vars) == 0 {