macroStack.lean:5:5-5:6: error(lean.unknownIdentifier): Unknown identifier `x`
macroStack.lean:9:6-9:7: 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:12:9-12:15: error: Nested action `← get` must be nested inside a `do` expression.
macroStack.lean:18:0-18:6: error: failed to synthesize instance of type class
  HAdd Nat String ?m

Hint: Type class instance resolution failures can be inspected with the `set_option trace.Meta.synthInstance 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