liba.js
#if 0
#include "libnonexisting.js"
#include "libb.js"
#endif
libb.js
Command line: emcc tests/hello_world.c --js-library liba.js -o a.html
Should be valid and build without errors, but currently fails with
Error: ENOENT: no such file or directory, open 'C:\code\emsdk\emscripten\incoming\src\libnonexisting.js'