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d9579d0f | 1 | // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT |
1a4d82fc JJ |
2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // Test that we invoking `foo()` successfully resolves to the trait `foo` | |
12 | // (prompting the mismatched types error) but does not influence the choice | |
13 | // of what kind of `Vec` we have, eventually leading to a type error. | |
14 | ||
15 | trait foo { | |
16 | fn foo(&self) -> isize; | |
17 | } | |
18 | ||
19 | impl foo for Vec<usize> { | |
20 | fn foo(&self) -> isize {1} | |
21 | } | |
22 | ||
23 | impl foo for Vec<isize> { | |
24 | fn foo(&self) -> isize {2} | |
25 | } | |
26 | ||
27 | // This is very hokey: we have heuristics to suppress messages about | |
28 | // type annotations required. But placing these two bits of code into | |
29 | // distinct functions, in this order, causes us to print out both | |
30 | // errors I'd like to see. | |
31 | ||
32 | fn m1() { | |
33 | // we couldn't infer the type of the vector just based on calling foo()... | |
d9579d0f | 34 | let mut x = Vec::new(); |
8bb4bdeb | 35 | //~^ ERROR type annotations needed [E0282] |
1a4d82fc JJ |
36 | x.foo(); |
37 | } | |
38 | ||
39 | fn m2() { | |
40 | let mut x = Vec::new(); | |
41 | ||
42 | // ...but we still resolved `foo()` to the trait and hence know the return type. | |
43 | let y: usize = x.foo(); //~ ERROR mismatched types | |
44 | } | |
45 | ||
46 | fn main() { } |