Upgrade to Rust 1.31.0 (#2052)

* Upgrade to Rust 1.31.0
* Upgrade nightly
* Fix all clippy warnings
* Revert relaxed version check and update

programs/native/budget/src/budget_program.rs

@@ -254,7 +254,8 @@ mod test {
                 let index = index as usize;
                 let key = &tx.account_keys[index];
                 (key, index < tx.signatures.len())
-            }).zip(program_accounts.iter_mut())
+            })
+            .zip(program_accounts.iter_mut())
             .map(|((key, is_signer), account)| KeyedAccount::new(key, is_signer, account))
             .collect();
 

programs/native/erc20/src/token_program.rs

@@ -106,7 +106,7 @@ impl Default for TokenProgram {
 }
 
 impl TokenProgram {
-    #[cfg_attr(feature = "cargo-clippy", allow(needless_pass_by_value))]
+    #[allow(clippy::needless_pass_by_value)]
     fn map_to_invalid_args(err: std::boxed::Box<bincode::ErrorKind>) -> Error {
         warn!("invalid argument: {:?}", err);
         Error::InvalidArgument
@@ -424,7 +424,8 @@ impl TokenProgram {
                 } else {
                     TokenProgram::Invalid
                 }
-            }).collect();
+            })
+            .collect();
 
         for program_account in &input_program_accounts {
             info!("input_program_account: userdata={:?}", program_account);

programs/native/lua_loader/src/lib.rs

@@ -169,7 +169,8 @@ mod tests {
             local tokens, _ = string.unpack("I", data)
             accounts[1].tokens = accounts[1].tokens - tokens
             accounts[2].tokens = accounts[2].tokens + tokens
-        "#.as_bytes()
+        "#
+        .as_bytes()
         .to_vec();
 
         let alice_pubkey = Pubkey::default();
@@ -214,7 +215,8 @@ mod tests {
         let userdata = r#"
             local serialize = load(accounts[2].userdata)().serialize
             accounts[3].userdata = serialize({a=1, b=2, c=3}, nil, "s")
-        "#.as_bytes()
+        "#
+        .as_bytes()
         .to_vec();
         let owner = Pubkey::default();
         let program_account = Account {
@@ -295,7 +297,8 @@ mod tests {
         let data = format!(
             r#"{{m=2, n={{"{}","{}","{}"}}, tokens=100}}"#,
             carol_pubkey, dan_pubkey, erin_pubkey
-        ).as_bytes()
+        )
+        .as_bytes()
         .to_vec();
 
         process(&owner, &mut keyed_accounts, &data, 0).unwrap();