Add an IterParser::fold method #883
Description
It seems the only way I can really "collect" the values from a repeated / separated_by combinator is via .collect? My issue with is that basically requires a heap allocation by using Vec or some alternative data structure that implements Collect. Other patterns I would intuitively expect to work such as .fold do not seem to work for some reason?
// ... more code
choice((
ident.clone().map(ParamExpr::NameRef),
label.clone().map(ParamExpr::FuncRef),
data_ref.clone().map(ParamExpr::DataRef),
u256_value.clone().map(|v| ParamExpr::Num(arena.alloc(v))),
))
.repeated()
// Can't do ?
.fold(BVec::with_capacity_in(16, arena), |mut exprs, expr| {
exprs.push(expr);
exprs
}),The error message Rust gives me for why .fold isn't working is very unreadable. Any ideas?