src/llvm-emscripten/test/tools/llvm-cov/Inputs/test_-a_-b.h.gcov

        -:    0:Source:./test.h
        -:    0:Graph:test.gcno
        -:    0:Data:test.gcda
        -:    0:Runs:2
        -:    0:Programs:1
function _ZN1AC1Ev called 2 returned 100% blocks executed 100%
function _ZN1AC2Ev called 2 returned 100% blocks executed 100%
        2:    1:struct A {
        2:    1-block  0
        2:    1-block  1
        -:    2:  virtual void B();
        -:    3:};