Rewrite check_pat_enum, split it into check_pat_tuple_struct and check_pat_path

Update definitions in def_map for associated types written in unqualified form (like `Self::Output`)
Cleanup finish_resolving_def_to_ty/resolve_ty_and_def_ufcs
Make VariantDef's available through constructor IDs

src/test/compile-fail/associated-types/cache/project-fn-ret-contravariant.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(fn_traits)]
 #![feature(unboxed_closures)]
 #![feature(rustc_attrs)]
 

src/test/compile-fail/associated-types/cache/project-fn-ret-invariant.rs

@@ -18,6 +18,7 @@
 
 // revisions: ok oneuse transmute krisskross
 
+#![feature(fn_traits)]
 #![allow(dead_code, unused_variables)]
 
 use std::marker::PhantomData;

src/test/compile-fail/empty-struct-braces-pat-1.rs

@@ -31,12 +31,14 @@ fn main() {
         Empty1 => () // Not an error, `Empty1` is interpreted as a new binding
     }
     match e3 {
-        E::Empty3 => () //~ ERROR `E::Empty3` does not name a tuple variant or a tuple struct
+        E::Empty3 => ()
+        //~^ ERROR `E::Empty3` does not name a unit variant, unit struct or a constant
     }
     match xe1 {
         XEmpty1 => () // Not an error, `XEmpty1` is interpreted as a new binding
     }
     match xe3 {
-        XE::XEmpty3 => () //~ ERROR `XE::XEmpty3` does not name a tuple variant or a tuple struct
+        XE::XEmpty3 => ()
+        //~^ ERROR `XE::XEmpty3` does not name a unit variant, unit struct or a constant
     }
 }

src/test/compile-fail/issue-32004.rs

@@ -18,7 +18,7 @@ struct S;
 fn main() {
     match Foo::Baz {
         Foo::Bar => {}
-        //~^ ERROR `Foo::Bar` does not name a tuple variant or a tuple struct
+        //~^ ERROR `Foo::Bar` does not name a unit variant, unit struct or a constant
         _ => {}
     }
 

src/test/compile-fail/method-path-in-pattern.rs

@@ -22,12 +22,13 @@ impl MyTrait for Foo {}
 
 fn main() {
     match 0u32 {
-        Foo::bar => {} //~ ERROR E0327
+        Foo::bar => {} //~ ERROR `Foo::bar` does not name a unit variant, unit struct or a constant
     }
     match 0u32 {
-        <Foo>::bar => {} //~ ERROR E0327
+        <Foo>::bar => {} //~ ERROR `bar` does not name a unit variant, unit struct or a constant
     }
     match 0u32 {
-        <Foo>::trait_bar => {} //~ ERROR E0327
+        <Foo>::trait_bar => {}
+        //~^ ERROR `trait_bar` does not name a unit variant, unit struct or a constant
     }
 }

src/test/compile-fail/qualified-path-params.rs

@@ -27,7 +27,8 @@ impl S {
 
 fn main() {
     match 10 {
-        <S as Tr>::A::f::<u8> => {} //~ ERROR associated items in match patterns must be constants
+        <S as Tr>::A::f::<u8> => {}
+        //~^ ERROR `Tr::A::f<u8>` does not name a unit variant, unit struct or a constant
         0 ... <S as Tr>::A::f::<u8> => {} //~ ERROR only char and numeric types are allowed in range
     }
 }