@terts I would urge you not to go down this road. Stick to mandatory semicolons. If it were entirely my call, I'd take a step *farther* toward mandatory statement terminators, and make

fn returns_b() -> rettype {
a();
b()
}

a syntax error; you would be obliged to write

fn returns_b() -> rettype {
a();
b();
}

and that would return the value returned by b, unlike Rust and current Roto. To return nothing, you would write

fn returns_unit() {
a();
b();
();
}