Merge pull request #72 from ethereum/go-errors

Go bindings: add missing error codes

bindings/go/evmc/evmc.go

@@ -110,17 +110,21 @@ func (err Error) Error() string {
 		return "evmc: precompile failure"
 	case C.EVMC_CONTRACT_VALIDATION_FAILURE:
 		return "evmc: contract validation failure"
-	case C.EVMC_INTERNAL_ERROR:
-		return "evmc: internal error"
+	case C.EVMC_ARGUMENT_OUT_OF_RANGE:
+		return "evmc: argument out of range"
+	case C.EVMC_WASM_UNREACHABLE_INSTRUCTION:
+		return "evmc: the WebAssembly unreachable instruction has been hit during execution"
+	case C.EVMC_WASM_TRAP:
+		return "evmc: a WebAssembly trap has been hit during execution"
 	case C.EVMC_REJECTED:
 		return "evmc: rejected"
 	}
 
 	if code < 0 {
-		return fmt.Sprintf("evmc: unknown internal error (%d)", int32(code))
+		return fmt.Sprintf("evmc: internal error (%d)", int32(code))
 	}
 
-	panic(fmt.Sprintf("evmc: unknown status code %d", int32(code)))
+	return fmt.Sprintf("evmc: unknown non-fatal status code %d", int32(code))
 }
 
 const (