notationPrecheck.lean:1:25-1:26: error: Unknown identifier `a` at quotation precheck

Note: You can use `set_option quotPrecheck false` to disable this check.
notationPrecheck.lean:4:16-4:19: error: no macro or `[quot_precheck]` instance for syntax kind `termB_` found
  b x
This means we cannot eagerly check your notation/quotation for unbound identifiers; you can use `set_option quotPrecheck false` to disable this check.
notationPrecheck.lean:8:7-8:8: error: elaboration function for `termB_` has not been implemented
  b x✝
notationPrecheck.lean:13:27-13:32: error: ambiguous notation with at least one interpretation that failed quotation precheck, possible interpretations 
  («term_∧__1» `x "∧" `y)
  Unknown identifier `y` at quotation precheck
  
  Note: You can use `set_option quotPrecheck false` to disable this check.
  
  («term_∧_» `x "∧" `y)
  Unknown identifier `y` at quotation precheck
  
  Note: You can use `set_option quotPrecheck false` to disable this check.