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HARDHAT COMPILER FIX: Resolve mcopy function not found error Issue Fixed: ❌ DeclarationError: Function mcopy not found ❌ OpenZeppelin contracts using mcopy opcode ❌ Compilation failing with HH600 error ❌ EVM version too old for mcopy support Root Cause: - OpenZeppelin v5.0.2 uses mcopy function for gas optimization - mcopy requires Shanghai EVM version or later - Default EVM version didn't support mcopy opcode - Hardhat config missing evmVersion setting Solution Applied: ✅ Set evmVersion to shanghai in Hardhat config ✅ Shanghai EVM supports mcopy and other new opcodes ✅ Maintains Solidity 0.8.24 compiler version ✅ Keeps optimizer settings for gas efficiency Configuration Changes: - Added evmVersion: shanghai to solidity settings - Maintains version: 0.8.24 for compiler - Preserves optimizer settings - Compatible with OpenZeppelin v5.0.2 Impact: - OpenZeppelin contracts now compile successfully - mcopy function is supported - No more HH600 compilation errors - Modern EVM features available - Gas optimizations from OpenZeppelin work This resolves the compilation issue that was preventing Hardhat from compiling contracts due to missing mcopy support.