Compiler Warning Reference
Auto-Mapping Warnings
These warnings indicate EVM globals that are auto-mapped to approximate Neo equivalents:
| Warning | Pattern | Action |
|---|---|---|
block.coinbase | Auto-mapped to address(0) | Review — always zero on Neo (no block miner in dBFT) |
block.difficulty | Auto-mapped to Runtime.getRandom() | Review — different randomness model |
block.gaslimit | Auto-mapped to Policy.getExecFeeFactor() | Review — different gas accounting |
block.basefee | Auto-mapped to Policy.getFeePerByte() | Review — different fee model |
| Ether literals | Parsed but warned | Convert to Neo GAS units (10^8 decimals) |
Standards Migration Warnings
| Code | Pattern | Fix |
|---|---|---|
| W101 | 2-param transfer(to, amount) | Add from and data params for NEP-17 |
| W102 | 3-param transfer(from, to, amount) | Add data parameter for NEP-17 |
| W103 | approve/allowance/transferFrom | Remove or keep as optional extensions |
| W104 | transferFrom(from, to, tokenId) | Replace with transfer(to, tokenId, data) |
| W105 | receive() / fallback() | Replace with onNEP17Payment callback |
| W106 | supportsInterface(bytes4) | Remove — manifest handles detection |
| W107 | ERC-1155 multi-token pattern | Split into separate NEP-17 and NEP-11 contracts |
| W108 | ERC-2612 permit pattern | Use Runtime.checkWitness() instead |