fix: use debug fmt for nested arrays (#527)

ethers-contract/ethers-contract-derive/src/display.rs

@@ -78,7 +78,7 @@ pub(crate) fn derive_eth_display_impl(input: DeriveInput) -> Result<TokenStream,
                         quote! {
                            write!(f, "[")?;
                            for (idx, val) in self.#ident.iter().enumerate() {
-                               write!(f, "{}", val)?;
+                               write!(f, "{:?}", val)?;
                                if idx < self.#ident.len() - 1 {
                                    write!(f, ", ")?;
                                }

ethers-contract/tests/common/derive.rs

@@ -441,6 +441,8 @@ fn can_derive_ethcall() {
         i: I256,
         arr_u8: [u8; 32],
         arr_u16: [u16; 32],
+        nested_arr: [[u8; 32]; 2],
+        double_nested: [[[u8; 32]; 2]; 3],
         v: Vec<u8>,
     }