Commits on Feb 5, 2021

1. Display a clear error on empty character literals '' …

   Before:
   > # '';;
   > Error: Syntax error
   
   After:
   > # '';;
   > Error: Illegal empty character literal ''
   >   Hint: Did you mean ' ' or a type variable 'a?
   
   Before, this input would get correctly lexed into QUOTE QUOTE and then
   fail in the parser with a generic "Syntax error" message. (Even if we
   had better error messages in the parser, here the parser-level error
   would not be very illuminating as ' is never the start of a valid
   expression or structure item).
   
   Fixes ocaml#10196.

   

   gasche committed Feb 5, 2021
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