Merged migrated compile-fail tests and ui tests. Fixes #46841.

src/test/ui/tuple/tuple-struct-fields/test.stderr

@@ -0,0 +1,20 @@
+error: expected one of `)` or `,`, found `(`
+  --> $DIR/test.rs:14:26
+   |
+LL |     struct S2(pub((foo)) ());
+   |                          ^ expected one of `)` or `,` here
+
+error[E0412]: cannot find type `foo` in this scope
+  --> $DIR/test.rs:14:20
+   |
+LL |     struct S2(pub((foo)) ());
+   |                    ^^^ not found in this scope
+
+error[E0601]: `main` function not found in crate `test`
+   |
+   = note: consider adding a `main` function to `$DIR/test.rs`
+
+error: aborting due to 3 previous errors
+
+Some errors occurred: E0412, E0601.
+For more information about an error, try `rustc --explain E0412`.