Move /src/test to /tests

tests/ui/const-generics/generic_arg_infer/array-repeat-expr.rs

@@ -0,0 +1,13 @@
+// run-pass
+
+// To avoid having to `or` gate `_` as an expr.
+#![feature(generic_arg_infer)]
+
+fn foo() -> [u8; 3] {
+    let x: [u8; _] = [0; _];
+    x
+}
+
+fn main() {
+    assert_eq!([0; _], foo());
+}