File: question-mark-type-infer.rs

package info (click to toggle)
rustc-web 1.70.0%2Bdfsg1-7~deb12u2
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,517,048 kB
  • sloc: xml: 147,962; javascript: 10,210; sh: 8,590; python: 8,220; ansic: 5,901; cpp: 4,635; makefile: 4,006; asm: 2,856
file content (16 lines) | stat: -rw-r--r-- 311 bytes parent folder | download | duplicates (18) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
 
// Test that type inference fails where there are multiple possible return types
// for the `?` operator.

fn f(x: &i32) -> Result<i32, ()> {
    Ok(*x)
}

fn g() -> Result<Vec<i32>, ()> {
    let l = [1, 2, 3, 4];
    l.iter().map(f).collect()?
    //~^ ERROR type annotations needed
}

fn main() {
    g();
}