Move some E0XXX to ui

Author: estebank

src/test/compile-fail/E0001.rs renamed to src/test/ui/error-codes/E0001.rs

@@ -0,0 +1,14 @@
+error: unreachable pattern
+  --> $DIR/E0001.rs:18:9
+   |
+18 |         _ => {/* ... */} //~ ERROR unreachable pattern
+   |         ^
+   |
+note: lint level defined here
+  --> $DIR/E0001.rs:11:9
+   |
+11 | #![deny(unreachable_patterns)]
+   |         ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/error-codes/E0001.stderr

@@ -0,0 +1,14 @@
+error[E0004]: non-exhaustive patterns: type std::option::Option<i32> is non-empty
+  --> $DIR/E0004-2.rs:14:11
+   |
+14 |     match x { } //~ ERROR E0004
+   |           ^
+   |
+help: Please ensure that all possible cases are being handled; possibly adding wildcards or more match arms.
+  --> $DIR/E0004-2.rs:14:11
+   |
+14 |     match x { } //~ ERROR E0004
+   |           ^
+
+error: aborting due to previous error
+

src/test/compile-fail/E0004-2.rs renamed to src/test/ui/error-codes/E0004-2.rs

@@ -0,0 +1,8 @@
+error[E0004]: non-exhaustive patterns: `HastaLaVistaBaby` not covered
+  --> $DIR/E0004.rs:19:11
+   |
+19 |     match x { //~ ERROR E0004
+   |           ^ pattern `HastaLaVistaBaby` not covered
+
+error: aborting due to previous error
+

src/test/ui/error-codes/E0004-2.stderr

@@ -0,0 +1,8 @@
+error[E0005]: refutable pattern in local binding: `None` not covered
+  --> $DIR/E0005.rs:13:9
+   |
+13 |     let Some(y) = x; //~ ERROR E0005
+   |         ^^^^^^^ pattern `None` not covered
+
+error: aborting due to previous error
+

src/test/compile-fail/E0004.rs renamed to src/test/ui/error-codes/E0004.rs

@@ -0,0 +1,14 @@
+error[E0007]: cannot bind by-move with sub-bindings
+  --> $DIR/E0007.rs:14:9
+   |
+14 |         op_string @ Some(s) => {},
+   |         ^^^^^^^^^^^^^^^^^^^ binds an already bound by-move value by moving it
+
+error[E0303]: pattern bindings are not allowed after an `@`
+  --> $DIR/E0007.rs:14:26
+   |
+14 |         op_string @ Some(s) => {},
+   |                          ^ not allowed after `@`
+
+error: aborting due to 2 previous errors
+