Add new repeat expr test.

Also add repeat expr test folder and move all related tests to it

src/test/ui/repeat-expr/infer.rs

@@ -0,0 +1,16 @@
+// check-pass
+
+#[derive(Clone, Default)]
+struct MaybeCopy<T>(T);
+
+impl Copy for MaybeCopy<u8> {}
+
+fn is_copy<T: Copy>(x: T) {
+    println!("{}", std::any::type_name::<T>());
+}
+
+fn main() {
+    is_copy(MaybeCopy::default());
+    [MaybeCopy::default(); 13];
+    // didn't work, because `Copy` was only checked in the mir
+}

src/tools/tidy/src/ui_tests.rs

@@ -7,7 +7,7 @@ use std::path::Path;
 
 const ENTRY_LIMIT: usize = 1000;
 // FIXME: The following limits should be reduced eventually.
-const ROOT_ENTRY_LIMIT: usize = 980;
+const ROOT_ENTRY_LIMIT: usize = 977;
 const ISSUES_ENTRY_LIMIT: usize = 2278;
 
 fn check_entries(path: &Path, bad: &mut bool) {