AttributeError: UsingForDirective对象没有属性“typeName”

Question

我试图从欧姆BondDepository.sol契约编译代码，但是每次我这样做时，我都会从brownie那里得到这个错误

Compiling contracts...
  Solc version: 0.7.5
  Optimizer: Enabled  Runs: 200
  EVM Version: Istanbul
Generating build data...
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\_cli\__main__.py", line 64, in main
    importlib.import_module(f"brownie._cli.{cmd}").main()
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\_cli\run.py", line 40, in main
    active_project = project.load()
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\main.py", line 751, in load
    return Project(name, project_path)
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\main.py", line 183, in __init__
    self.load()
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\main.py", line 238, in load
    self._compile(changed, self._compiler_config, False)
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\main.py", line 95, in _compile
    build_json = compiler.compile_and_format(
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\compiler\__init__.py", line 142, in compile_and_format
    build_json.update(generate_build_json(input_json, output_json, compiler_data, silent))
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\compiler\__init__.py", line 287, in generate_build_json
    source_nodes, statement_nodes, branch_nodes = solidity._get_nodes(output_json)
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\brownie\project\compiler\solidity.py", line 606, in _get_nodes
    source_nodes = solcast.from_standard_output(output_json)
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\solcast\main.py", line 33, in from_standard_output
    source_nodes = set_dependencies(source_nodes)
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\solcast\dependencies.py", line 18, in set_dependencies
    contract.libraries = dict(
  File "C:\Users\provsalt\AppData\Local\Programs\Python\Python39\lib\site-packages\solcast\dependencies.py", line 19, in <genexpr>
    (_get_type_name(i.typeName), i.libraryName.name)
AttributeError: 'UsingForDirective' object has no attribute 'typeName'

在查找此错误后，在第617行使用FixedPoint进行*时似乎是一个错误。与其使用这种语法，我如何才能修复它，使它不只是崩溃？坦率地说，我对稳健性很陌生，不明白这种语法是如何工作的。

Answer 1

我想原因就在这串：

using FixedPoint for *;

我消除了这个错误，改变了估价(.)

 _value = totalValue.mul( FixedPoint.decode112with18( FixedPoint.fraction( amount_, totalSupply ) ) ).div( 1e18 );