f 1 : (Nat → Nat) → Nat
appParserIssue.lean:5:11: error: expected command
f 1 (λ (x : Nat), x) : Nat
f 1 (λ (x : Nat), x) : Nat
f 1 (λ (x : Nat), x) : Nat
appParserIssue.lean:13:13: error: unexpected token at this precedence level; consider parenthesizing the term