Move /src/test to /tests

tests/ui/const-generics/unify_with_nested_expr.stderr

@@ -0,0 +1,22 @@
+error[E0284]: type annotations needed
+  --> $DIR/unify_with_nested_expr.rs:8:5
+   |
+LL |     bar();
+   |     ^^^ cannot infer the value of the const parameter `N` declared on the function `bar`
+   |
+note: required by a bound in `bar`
+  --> $DIR/unify_with_nested_expr.rs:14:10
+   |
+LL | fn bar<const N: usize>()
+   |    --- required by a bound in this
+LL | where
+LL |     [(); N + 1]:,
+   |          ^^^^^ required by this bound in `bar`
+help: consider specifying the generic argument
+   |
+LL |     bar::<N>();
+   |        +++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0284`.