tests: vyper: fix compilation failure

  Testing vyper integration of /opt/hostedtoolcache/Python/3.12.7/x64/bin/crytic-compile
  ERROR:CryticCompile:missing type annotation

    (hint: did you mean something like `for i: uint256 in ...`?)

    line 111:4
         110     refund: uint256 = 0
    ---> 111     for i in range(MAX_BIDS):
    -------------^
         112         # Note that loop may break sooner than 128 iterations if i >= _numBids

  ERROR:CryticCompile:Vyper compilation errored
  vyper test failed

Author: elopez

scripts/ci_test_vyper.sh

@@ -4,11 +4,17 @@
 
 pip install vyper
 
+if vyper --version | grep -q 0.3; then
+    TEST_FILE=auction-0.3.vy
+else
+    TEST_FILE=auction-0.4.vy
+fi
+
 echo "Testing vyper integration of $(realpath "$(which crytic-compile)")"
 
 cd tests/vyper || exit 255
 
-if ! crytic-compile auction.vy --export-formats standard
+if ! crytic-compile "$TEST_FILE" --export-formats standard
 then echo "vyper test failed" && exit 255
 else echo "vyper test passed" && exit 0
-fi
+fi

tests/vyper/auction.vy renamed to tests/vyper/auction-0.3.vy

@@ -0,0 +1,178 @@
+# Taken from https://github.com/vyperlang/vyper/blob/9136169468f317a53b4e7448389aa315f90b95ba/examples/auctions/blind_auction.vy
+# Blind Auction. Adapted to Vyper from [Solidity by Example](https://github.com/ethereum/solidity/blob/develop/docs/solidity-by-example.rst#blind-auction-1)
+
+struct Bid:
+  blindedBid: bytes32
+  deposit: uint256
+
+# Note: because Vyper does not allow for dynamic arrays, we have limited the
+# number of bids that can be placed by one address to 128 in this example
+MAX_BIDS: constant(int128) = 128
+
+# Event for logging that auction has ended
+event AuctionEnded:
+    highestBidder: address
+    highestBid: uint256
+
+# Auction parameters
+beneficiary: public(address)
+biddingEnd: public(uint256)
+revealEnd: public(uint256)
+
+# Set to true at the end of auction, disallowing any new bids
+ended: public(bool)
+
+# Final auction state
+highestBid: public(uint256)
+highestBidder: public(address)
+
+# State of the bids
+bids: HashMap[address, Bid[128]]
+bidCounts: HashMap[address, int128]
+
+# Allowed withdrawals of previous bids
+pendingReturns: HashMap[address, uint256]
+
+
+# Create a blinded auction with `_biddingTime` seconds bidding time and
+# `_revealTime` seconds reveal time on behalf of the beneficiary address
+# `_beneficiary`.
+@external
+def __init__(_beneficiary: address, _biddingTime: uint256, _revealTime: uint256):
+    self.beneficiary = _beneficiary
+    self.biddingEnd = block.timestamp + _biddingTime
+    self.revealEnd = self.biddingEnd + _revealTime
+
+
+# Place a blinded bid with:
+#
+# _blindedBid = keccak256(concat(
+#       convert(value, bytes32),
+#       convert(fake, bytes32),
+#       secret)
+# )
+#
+# The sent ether is only refunded if the bid is correctly revealed in the
+# revealing phase. The bid is valid if the ether sent together with the bid is
+# at least "value" and "fake" is not true. Setting "fake" to true and sending
+# not the exact amount are ways to hide the real bid but still make the
+# required deposit. The same address can place multiple bids.
+@external
+@payable
+def bid(_blindedBid: bytes32):
+    # Check if bidding period is still open
+    assert block.timestamp < self.biddingEnd
+
+    # Check that payer hasn't already placed maximum number of bids
+    numBids: int128 = self.bidCounts[msg.sender]
+    assert numBids < MAX_BIDS
+
+    # Add bid to mapping of all bids
+    self.bids[msg.sender][numBids] = Bid({
+        blindedBid: _blindedBid,
+        deposit: msg.value
+        })
+    self.bidCounts[msg.sender] += 1
+
+
+# Returns a boolean value, `True` if bid placed successfully, `False` otherwise.
+@internal
+def placeBid(bidder: address, _value: uint256) -> bool:
+    # If bid is less than highest bid, bid fails
+    if (_value <= self.highestBid):
+        return False
+
+    # Refund the previously highest bidder
+    if (self.highestBidder != empty(address)):
+        self.pendingReturns[self.highestBidder] += self.highestBid
+
+    # Place bid successfully and update auction state
+    self.highestBid = _value
+    self.highestBidder = bidder
+
+    return True
+
+
+# Reveal your blinded bids. You will get a refund for all correctly blinded
+# invalid bids and for all bids except for the totally highest.
+@external
+def reveal(_numBids: int128, _values: uint256[128], _fakes: bool[128], _secrets: bytes32[128]):
+    # Check that bidding period is over
+    assert block.timestamp > self.biddingEnd
+
+    # Check that reveal end has not passed
+    assert block.timestamp < self.revealEnd
+
+    # Check that number of bids being revealed matches log for sender
+    assert _numBids == self.bidCounts[msg.sender]
+
+    # Calculate refund for sender
+    refund: uint256 = 0
+    for i: uint256 in range(MAX_BIDS):
+        # Note that loop may break sooner than 128 iterations if i >= _numBids
+        if (i >= _numBids):
+            break
+
+        # Get bid to check
+        bidToCheck: Bid = (self.bids[msg.sender])[i]
+
+        # Check against encoded packet
+        value: uint256 = _values[i]
+        fake: bool = _fakes[i]
+        secret: bytes32 = _secrets[i]
+        blindedBid: bytes32 = keccak256(concat(
+            convert(value, bytes32),
+            convert(fake, bytes32),
+            secret
+        ))
+
+        # Bid was not actually revealed
+        # Do not refund deposit
+        assert blindedBid == bidToCheck.blindedBid
+
+        # Add deposit to refund if bid was indeed revealed
+        refund += bidToCheck.deposit
+        if (not fake and bidToCheck.deposit >= value):
+            if (self.placeBid(msg.sender, value)):
+                refund -= value
+
+        # Make it impossible for the sender to re-claim the same deposit
+        zeroBytes32: bytes32 = empty(bytes32)
+        bidToCheck.blindedBid = zeroBytes32
+
+    # Send refund if non-zero
+    if (refund != 0):
+        send(msg.sender, refund)
+
+
+# Withdraw a bid that was overbid.
+@external
+def withdraw():
+    # Check that there is an allowed pending return.
+    pendingAmount: uint256 = self.pendingReturns[msg.sender]
+    if (pendingAmount > 0):
+        # If so, set pending returns to zero to prevent recipient from calling
+        # this function again as part of the receiving call before `transfer`
+        # returns (see the remark above about conditions -> effects ->
+        # interaction).
+        self.pendingReturns[msg.sender] = 0
+
+        # Then send return
+        send(msg.sender, pendingAmount)
+
+
+# End the auction and send the highest bid to the beneficiary.
+@external
+def auctionEnd():
+    # Check that reveal end has passed
+    assert block.timestamp > self.revealEnd
+
+    # Check that auction has not already been marked as ended
+    assert not self.ended
+
+    # Log auction ending and set flag
+    log AuctionEnded(self.highestBidder, self.highestBid)
+    self.ended = True
+
+    # Transfer funds to beneficiary
+    send(self.beneficiary, self.highestBid)