Module feature_check::defs

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Common definitions for the feature-check crate’s modules.



  • The result of evaluating either a single term or the whole expression.
  • The feature-check operating mode, usually “List”.
  • Errors that can occur during querying a program’s features.
  • The result of querying a program for its supported features.
  • Errors that can occur during parsing a test expression or the features line.


  • The default option to pass to a program to obtain the list of features.
  • The default prefix to look for in the lines output by the program.


  • An object that may be evaluated and provide a result.