Add repetition test with array of array

    error[E0599]: the method `quote_into_iter` exists for struct `RepInterp<&[u8; 2]>`, but its trait bounds were not satisfied
       --> tests/test.rs:110:13
        |
    110 |     let _ = quote!(#(#(#array_of_array)*)*);
        |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method cannot be called on `RepInterp<&[u8; 2]>` due to unsatisfied trait bounds
        |
       ::: /git/quote/src/runtime.rs:158:1
        |
    158 | pub struct RepInterp<T>(pub T);
        | ----------------------- doesn't satisfy 5 bounds
        |
    note: there's an earlier shadowed binding `array_of_array` of type `[[u8; 2]; 2]` that has method `quote_into_iter` available
       --> tests/test.rs:109:9
        |
    109 |     let array_of_array: [[u8; 2]; 2] = [[0; 2]; 2];
        |         ^^^^^^^^^^^^^^ `array_of_array` of type `[[u8; 2]; 2]` that has method `quote_into_iter` defined earlier here
    110 |     let _ = quote!(#(#(#array_of_array)*)*);
        |             ------------------------------- earlier `array_of_array` shadowed here with type `RepInterp<&[u8; 2]>`
        = note: the following trait bounds were not satisfied:
                `RepInterp<&[u8; 2]>: Iterator`
                which is required by `RepInterp<&[u8; 2]>: ext::RepIteratorExt`
                `&RepInterp<&[u8; 2]>: Iterator`
                which is required by `&RepInterp<&[u8; 2]>: ext::RepIteratorExt`
                `RepInterp<&[u8; 2]>: quote::ToTokens`
                which is required by `RepInterp<&[u8; 2]>: ext::RepToTokensExt`
                `&[u8; 2]: ext::RepAsIteratorExt<'_>`
                which is required by `RepInterp<&[u8; 2]>: ext::RepAsIteratorExt<'_>`
                `&mut RepInterp<&[u8; 2]>: Iterator`
                which is required by `&mut RepInterp<&[u8; 2]>: ext::RepIteratorExt`
        = note: this error originates in the macro `$crate::quote_bind_into_iter` which comes from the expansion of the macro `quote` (in Nightly builds, run with -Z macro-backtrace for more info)

Author: dtolnay

tests/test.rs

@@ -105,6 +105,9 @@ fn test_array() {
 
     let ref_slice: &[X] = &[X, X];
     let _ = quote!(#(#ref_slice #ref_slice)*);
+
+    let array_of_array: [[u8; 2]; 2] = [[0; 2]; 2];
+    let _ = quote!(#(#(#array_of_array)*)*);
 }
 
 #[test]