Patterns used to bind names must be irrefutable. That is, they must guarantee
that a name will be extracted in all cases. Instead of pattern matching the
loop variable, consider using a match
or if let
inside the loop body. For
instance:
let xs : Vec<Option<i32>> = vec![Some(1), None];
// This fails because `None` is not covered.
for Some(x) in xs {
// ...
}
RunMatch inside the loop instead:
let xs : Vec<Option<i32>> = vec![Some(1), None];
for item in xs {
match item {
Some(x) => {},
None => {},
}
}
RunOr use if let
:
let xs : Vec<Option<i32>> = vec![Some(1), None];
for item in xs {
if let Some(x) = item {
// ...
}
}
Run