Setup online lpython by ubaidsk · Pull Request #2328 · lcompilers/lpython
LPython's parser segfaults in many cases when LPython is build to wasm. It seems LPython uses a different parser as compared to LFortran. I think LPython uses LR(1) parser where as LFortran uses GLR parser.
The above -fsanitize flag is actually a debugging flag, but it seems to make LPython's parser to work.