macroStack.lean:4:5-4:6: error(lean.unknownIdentifier): Unknown identifier `x`
macroStack.lean:8:6-8:7: error: Unknown identifier `x`
with resulting expansion
  binrel% GT.gt✝ x 0
while expanding
  x > 0
while expanding
  (x > 0)
while expanding
  if h : (x > 0) then 1 else 0
macroStack.lean:11:9-11:15: error: invalid use of `(<- ...)`, must be nested inside a 'do' expression
macroStack.lean:17:0-17:6: error: failed to synthesize
  HAdd Nat String ?m

Hint: Additional diagnostic information may be available using the `set_option diagnostics true` command.
with resulting expansion
  binop% HAdd.hAdd✝ (x + x✝) x✝¹
while expanding
  (x + x✝) + x✝¹
while expanding
  foo!(x + x✝)
while expanding
  foo!(x + x✝) < 1
while expanding
  if foo!(x + x✝) < 1 then true✝ else false✝
while expanding
  bla! x