What does Some() do on the left hand side of a variable assignment?

Question

I was reading some Rust code and I came across this line

if let Some(path) = env::args().nth(1) {

Inside of this function

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Answer 1

The other answers go into a lot of detail, which might be more than you need to know.

Essentially, this:

if let Some(path) = env::args().nth(1) {
    // Do something with path
} else {
    // otherwise do something else
}

is identical to this:

match env::args().nth(1) {
    Some(path) => { /* Do something with path */ }
    _          => { /* otherwise do something else */ }
}