File: question-mark-type-infer.rs

package info (click to toggle)
rustc 1.88.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 934,128 kB
  • sloc: xml: 158,127; python: 36,062; javascript: 19,855; sh: 19,700; cpp: 18,947; ansic: 12,993; asm: 4,792; makefile: 690; lisp: 29; perl: 29; ruby: 19; sql: 11
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();
}