Concepts

Here is a list of all concepts with brief descriptions:

Nfe
RBitEnum
RDiagnosable	Every frontend building block reports into the Error of S::driver
RFormattable
RLexable	What fe::Parser needs of its CRTP child S beyond fe::Diagnosable: the Lexer to pull Tokens from
RNodeable
RNodeSetable	Like Nodeable, but for a class that spans a set of node kinds instead of a single one
RQueuelike	Something which behaves like std::queue
RStacklike	Something which behaves like std::stack or std::priority_queue
RToken	What fe::Parser needs of its Token type: a Tag and a Loc, copied in and out of the lookahead by value
RVectorlike	Something which behaves like std::vector or std::array
RVLAed	Does T carry VLAs?