CODEWITHSUNDEEP
rusttype-inferencehyper
Roman Smelyansky
Roman Smelyansky

Reputation: 319

Unable to create hyper::Client because the compiler cannot infer enough type information

To experiment with Hyper, I started with the GET example. Aside the fact that the example doesn't compile (no method `get` in `client`) I have distilled my problem to a single line:

fn temp() {
    let client = Client::new();
}

This code won't compile:

 unable to infer enough type information about `_`; type annotations or generic parameter binding required [E0282]

Upvotes: 2

Views: 529

Answers (1)

michalsrb
michalsrb

Reputation: 4891

In general this error would mean that Client has some generic parameter and the compiler can not infer it's value. You would have to tell it somehow.

Here is example with std::vec::Vec:

use std::vec::Vec;

fn problem() {
    let v = Vec::new(); // Problem, which Vec<???> do you want?
}

fn solution_1() {
    let mut v = Vec::<i32>::new(); // Tell the compiler directly
}

fn solution_2() {
    let mut v: Vec<i32> = Vec::new(); // Tell the compiler by specifying the type
}

fn solution_3() {
    let mut v = Vec::new();
    v.push(1); // Tell the compiler by using it
}

But hyper::client::Client doesn't have any generic parameters. Are you sure the Client you are trying to instantiate is the one from Hyper?

Upvotes: 4

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