unnecessary-fallible-conversion

Simplify fallible integer conversions that cannot fail

A fallible integer conversion adds an undefined case when the source type always fits the destination.
Instead, you SHOULD remove identity conversions and use as for lossless widening conversions.

- Category: style
- Level: warning
- Fix: automatic
- Scope: module

Reported

function widen(value: int32): int64 | undefined {
    return value.tryInto<int64>();
}
Accepted

function widen(value: int32): int64 | undefined {
    return value as int64;
}
Prior art

- Clippy · unnecessaryfallibleconversions

language/linter/src/rules/style/unnecessaryfallibleconversion.rs:8