io - Rust: Lifetime of String from file -


this question has answer here:

i'm trying read in external glsl code rust. reading works properly, run lifetime issue in final expression (in ok(_) branch)

error: s not live long enough

fn read_shader_code(string_path: &str) -> &str {     let path = path::new(string_path);     let display = path.display();      let mut file = match file::open(&path) {         err(why) => panic!("couldn't open {}: {}", display, error::description(&why)),         ok(file) => file,     };      let mut s = string::new();     match file.read_to_string(&mut s) {         err(why) => panic!("couldn't read {}: {}", display, error::description(&why)),         ok(_) => &s,     } }

the string bound "s" deallocated once function ends ("s" goes out of scope), cannot return reference contents outside function. best way return string itself:

fn read_shader_code(string_path: &str) -> string {     let path = path::new(string_path);     let display = path.display();      let mut file = match file::open(&path) {         err(why) => panic!("couldn't open {}: {}", display, error::description(&why)),         ok(file) => file,     };      let mut s = string::new();     match file.read_to_string(&mut s) {         err(why) => panic!("couldn't read {}: {}", display, error::description(&why)),         ok(_) => s,     } }

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