convert errors to warnings

Author: arielb1

Diff for: src/librustc/lint/builtin.rs

@@ -206,7 +206,7 @@ declare_lint! {
 
 declare_lint! {
     pub INCOHERENT_FUNDAMENTAL_IMPLS,
-    Deny,
+    Warn,
     "potentially-conflicting impls were erroneously allowed"
 }
 

Diff for: src/librustc/traits/coherence.rs

@@ -277,7 +277,7 @@ pub fn orphan_check<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>,
 ///    impl<T> IntoIterator for Vec<T>
 ///    impl<T: Iterator> IntoIterator for T
 ///    ```
-///    We need to be able to prove that `Option<$0>: !Iterator` for every type $0.
+///    We need to be able to prove that `Vec<$0>: !Iterator` for every type $0.
 ///    We can observe that this holds in the current crate, but we need to make
 ///    sure this will also hold in all unknown crates (both "independent" crates,
 ///    which we need for link-safety, and also child crates, because we don't want

Diff for: src/test/compile-fail/issue-43355.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![deny(incoherent_fundamental_impls)]
+
 pub trait Trait1<X> {
     type Output;
 }

Diff for: src/test/run-pass/issue-43355.rs

@@ -11,8 +11,6 @@
 // Check that the code for issue #43355 can run without an ICE, please remove
 // this test when it becomes an hard error.
 
-#![allow(incoherent_fundamental_impls)]
-
 pub trait Trait1<X> {
     type Output;
 }