Before: runtime ale_linters/thrift/thriftcheck.vim After: call ale#linter#Reset() Execute(The thriftcheck handler should handle basic warnings and errors): AssertEqual \ [ \ { \ 'lnum': 1, \ 'col': 1, \ 'type': 'E', \ 'text': '"py" namespace must match "^idl\\."', \ 'code': 'namespace.pattern', \ }, \ { \ 'lnum': 3, \ 'col': 5, \ 'type': 'W', \ 'text': '64-bit integer constant -2147483649 may not work in all languages', \ 'code': 'int.64bit', \ }, \ ], \ ale_linters#thrift#thriftcheck#Handle(1, [ \ 'file.thrift:1:1: error: "py" namespace must match "^idl\\." (namespace.pattern)', \ 'file.thrift:3:5: warning: 64-bit integer constant -2147483649 may not work in all languages (int.64bit)', \ ])