auto merge of #17028 : pcwalton/rust/higher-rank-trait-lifetimes, r=pnkfelix

They will ICE during typechecking if used, because they depend on trait
reform.

This is part of unboxed closures.

r? @nikomatsakis

src/test/compile-fail/regions-name-duplicated.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 struct Foo<'a, 'a> { //~ ERROR lifetime name `'a` declared twice
+//~^ ERROR lifetime name `'a` declared twice
     x: &'a int
 }
 

src/test/compile-fail/regions-name-static.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 struct Foo<'static> { //~ ERROR illegal lifetime parameter name: `'static`
+//~^ ERROR illegal lifetime parameter name: `'static`
     x: &'static int
 }