I’m curious at how it a actually possible to have partial autocompletion and still have some static analysis tools work with syntax errors in badly formed ASTs.

I’m curious at how it a actually possible to have partial autocompletion and still have some static analysis tools work with syntax errors in badly formed ASTs. Even visual studio, an IDE with massive resources behind it can’t accomplish this with c++. Is this even possible? At face value it seems possible but I’m surprised that more IDEs don’t have this support.