Cannot use new Function syntax in const Map declaration

[kevmoo]

Dart VM version: 2.0.0-dev.49.0

Could expect this to be fine.

enum ArgType { option, flag, multiOption, rest, wasParsed, command }

const specialTypes = const <ArgType, bool Function(FieldElement)>{
  ArgType.rest: _couldBeRestArg,
  ArgType.wasParsed: _couldBeWasParsedArg,
  ArgType.command: _couldBeCommand
};

Instead

Analyzing build_cli...
  error • Const variables must be initialized with a constant value at lib/src/arg_info.dart:29:38 • const_initialized_with_non_constant_value
1 error found.

[kevmoo]

work-around

typedef _fieldChecker = bool Function(FieldElement);

const specialTypes = const <ArgType, _fieldChecker>{
  ArgType.rest: _couldBeRestArg,
  ArgType.wasParsed: _couldBeWasParsedArg,
  ArgType.command: _couldBeCommand
};

[natebosch]

This is not surfacing any errors for me now.