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(* Adding an only-printing notation should not override existing
interpretations for the same notation. *)
Notation "$ x" := (@id nat x) (only parsing, at level 0).
Notation "$ x" := (@id bool x) (only printing, at level 0).
Check $1. (* Was: Error: Unknown interpretation for notation "$ _". *)
(* Adding an only-printing notation should not let believe
that a parsing rule has been given *)
Notation "$ x" := (@id bool x) (only printing, at level 0).
Notation "$ x" := (@id nat x) (only parsing, at level 0).
Check $1. (* Was: Error: Syntax Error: Lexer: Undefined token *)
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