Add support custom errors in require

slither/core/declarations/solidity_variables.py

@@ -50,6 +50,7 @@
     "assert(bool)": [],
     "require(bool)": [],
     "require(bool,string)": [],
+    "require(bool,error)": [],  # Solidity 0.8.26 via-ir and Solidity >= 0.8.27
     "revert()": [],
     "revert(string)": [],
     "revert ": [],

tests/e2e/solc_parsing/test_data/expected/require-error.sol-0.8.27-compact.json

@@ -0,0 +1,5 @@
+{
+  "TestToken": {
+    "transferWithRequireError(address,uint256)": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: EXPRESSION 1\n\"];\n1->2;\n2[label=\"Node Type: EXPRESSION 2\n\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n}\n"
+  }
+}

tests/e2e/solc_parsing/test_data/require-error.sol

@@ -0,0 +1,20 @@
+pragma solidity 0.8.27;
+
+/// Insufficient balance for transfer. Needed `required` but only
+/// `available` available.
+/// @param available balance available.
+/// @param required requested amount to transfer.
+error InsufficientBalance(uint256 available, uint256 required);
+
+contract TestToken {
+    mapping(address => uint) balance;
+    function transferWithRequireError(address to, uint256 amount) public {
+        require(
+            balance[msg.sender] >= amount,
+            InsufficientBalance(balance[msg.sender], amount)
+        );
+        balance[msg.sender] -= amount;
+        balance[to] += amount;
+    }
+    // ...
+}