1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
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.
11 // does the second one subsume the first?
15 // notes on this test case:
16 // On Thu, Apr 18, 2013 at 6:30 PM, John Clements <clements@brinckerhoff.org> wrote:
17 // the "issue-2185.rs" test was xfailed with a ref to #2263. Issue #2263 is now fixed, so I tried it again, and after adding some &self parameters, I got this error:
19 // Running /usr/local/bin/rustc:
20 // issue-2185.rs:24:0: 26:1 error: conflicting implementations for a trait
21 // issue-2185.rs:24 impl iterable<uint> for @fn(&fn(uint)) {
22 // issue-2185.rs:25 fn iter(&self, blk: &fn(v: uint)) { self( |i| blk(i) ) }
24 // issue-2185.rs:20:0: 22:1 note: note conflicting implementation here
25 // issue-2185.rs:20 impl<A> iterable<A> for @fn(&fn(A)) {
26 // issue-2185.rs:21 fn iter(&self, blk: &fn(A)) { self(blk); }
29 // … so it looks like it's just not possible to implement both the generic iterable<uint> and iterable<A> for the type iterable<uint>. Is it okay if I just remove this test?
31 // but Niko responded:
32 // think it's fine to remove this test, just because it's old and cruft and not hard to reproduce. *However* it should eventually be possible to implement the same interface for the same type multiple times with different type parameters, it's just that our current trait implementation has accidental limitations.
34 // so I'm leaving it in.
35 // actually, it looks like this is related to bug #3429. I'll rename this bug.
37 // This test had to do with an outdated version of the iterable trait.
38 // However, the condition it was testing seemed complex enough to
39 // warrant still having a test, so I inlined the old definitions.
42 fn iter(&self, blk: &fn(A));
45 impl<A> iterable<A> for @fn(&fn(A)) {
46 fn iter(&self, blk: &fn(A)) { self(blk); }
49 impl iterable<uint> for @fn(&fn(uint)) {
50 fn iter(&self, blk: &fn(v: uint)) { self( |i| blk(i) ) }
53 fn filter<A,IA:iterable<A>>(self: IA, prd: @fn(A) -> bool, blk: &fn(A)) {
59 fn foldl<A,B,IA:iterable<A>>(self: IA, b0: B, blk: &fn(B, A) -> B) -> B {
67 fn range(lo: uint, hi: uint, it: &fn(uint)) {
76 let range: @fn(&fn(uint)) = |a| range(0u, 1000u, a);
77 let filt: @fn(&fn(v: uint)) = |a| filter(
79 |&&n: uint| n % 3u != 0u && n % 5u != 0u,
81 let sum = foldl(filt, 0u, |accum, &&n: uint| accum + n );
83 io::println(fmt!("%u", sum));