It's trivial to have fast compilation speed if all you do is transpile to C (naively, i.e. without any program analysis) and use TCC to compile the C (again, naively, that's why it's so fast). Such "languages" are often written as CS homework assignments.
But even with the transpilation step, the V transpiler is still unable to output correct code on trivial examples, demonstrated in other comments. The fact that you have thousands of tests (Alex's words) and the trivial examples still fail, makes me completely sure that something about the whole approach is fundamentally wrong; which lead me to the "testing whether your regex parses html properly" comment. Tests are useless if the thing you're testing does not prove anything.
The fact that the author is pushing this unfinished mess as a completed achievement (instead of work in progress), without ever mentioning any downsides (except when presented with undeniable proof, at which point he makes up another justification for the issue), only shows the author's inexperience and disconnection from the community. V compiler is a toy project wrapped up in a pretty box to look like something serious. And when faced with criticism, Alex seems to turn to his three different accounts to argue with the commenters, instead of reading the damn Dragon Book and fixing his damn compiler.
To me, personally, V language is the perfect example of an overhyped griftwork.
