use ty::subst::Subst;
use util::nodemap::{FxHashMap, FxHashSet};
-use std::cmp;
use std::fmt;
use syntax::ast;
use hir::{intravisit, Local, Pat};
return;
}
- let end = cmp::min(4, impl_candidates.len());
+ let end = if impl_candidates.len() <= 5 {
+ impl_candidates.len()
+ } else {
+ 4
+ };
err.help(&format!("the following implementations were found:{}{}",
&impl_candidates[0..end].iter().map(|candidate| {
format!("\n {:?}", candidate)
}).collect::<String>(),
- if impl_candidates.len() > 4 {
+ if impl_candidates.len() > 5 {
format!("\nand {} others", impl_candidates.len() - 4)
} else {
"".to_owned()
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+trait Foo<B> {
+ fn bar(&self){}
+}
+
+impl Foo<u8> for i8 {}
+impl Foo<u16> for i8 {}
+impl Foo<u32> for i8 {}
+impl Foo<u64> for i8 {}
+impl Foo<bool> for i8 {}
+
+impl Foo<u16> for u8 {}
+impl Foo<u32> for u8 {}
+impl Foo<u64> for u8 {}
+impl Foo<bool> for u8 {}
+
+impl Foo<u8> for bool {}
+impl Foo<u16> for bool {}
+impl Foo<u32> for bool {}
+impl Foo<u64> for bool {}
+impl Foo<bool> for bool {}
+impl Foo<i8> for bool {}
+
+fn main() {
+ Foo::<i32>::bar(&1i8);
+ Foo::<i32>::bar(&1u8);
+ Foo::<i32>::bar(&true);
+}
--- /dev/null
+error[E0277]: the trait bound `i8: Foo<i32>` is not satisfied
+ --> $DIR/issue-39802-show-5-trait-impls.rs:34:5
+ |
+34 | Foo::<i32>::bar(&1i8);
+ | ^^^^^^^^^^^^^^^ the trait `Foo<i32>` is not implemented for `i8`
+ |
+ = help: the following implementations were found:
+ <i8 as Foo<u8>>
+ <i8 as Foo<u16>>
+ <i8 as Foo<u32>>
+ <i8 as Foo<u64>>
+ <i8 as Foo<bool>>
+ = note: required by `Foo::bar`
+
+error[E0277]: the trait bound `u8: Foo<i32>` is not satisfied
+ --> $DIR/issue-39802-show-5-trait-impls.rs:35:5
+ |
+35 | Foo::<i32>::bar(&1u8);
+ | ^^^^^^^^^^^^^^^ the trait `Foo<i32>` is not implemented for `u8`
+ |
+ = help: the following implementations were found:
+ <u8 as Foo<u16>>
+ <u8 as Foo<u32>>
+ <u8 as Foo<u64>>
+ <u8 as Foo<bool>>
+ = note: required by `Foo::bar`
+
+error[E0277]: the trait bound `bool: Foo<i32>` is not satisfied
+ --> $DIR/issue-39802-show-5-trait-impls.rs:36:5
+ |
+36 | Foo::<i32>::bar(&true);
+ | ^^^^^^^^^^^^^^^ the trait `Foo<i32>` is not implemented for `bool`
+ |
+ = help: the following implementations were found:
+ <bool as Foo<u8>>
+ <bool as Foo<u16>>
+ <bool as Foo<u32>>
+ <bool as Foo<u64>>
+ and 2 others
+ = note: required by `Foo::bar`
+
+error: aborting due to 3 previous errors
+