Lifetimes issues while implementing `FromStr` for my struct

[kpreid]

The way the FromStr trait is defined, you cannot produce a result which borrows from the input, because FromStr::from_str() always uses an input lifetime unrelated to Self. Your choices are:

• Don't make Cedict borrow the input string, but own each piece (use String instead of &'a str). This also means that the Cedict is allowed to outlive the input, which might be desirable — right now, you're going to have to use the Cedict only within the stack frame that created it.
• Don't use FromStr; just write your own function in impl Cedict {}. Then you're free to design the signature as you need it. (Or if you really want a trait, implement TryFrom<&'a str>.)

Another recent thread on the same problem:

Impl FromStr for tuple struct with &str

how do I resolve the lifetime error for &str, if I use String it works also how to use statements in match branch? the commented out part doesnot work thanks use std::string::ParseError; #[derive(Debug, PartialEq)] struct MyType<'a>(&'a str); impl<'a> FromStr for MyType<'a> { type Err = ParseError; fn from_str(s: &str) -> Result<Self, Self::Err> { let t = s.trim(); // match t.is_empty() { // true => Ok(MyType("my")), // _ => { // …