appParserIssue.lean:5:11: error: unexpected token; expected longestMatch: empty list or '('
f 1 (λ (x : Nat), x) : Nat
f 1 (λ (x : Nat), x) : Nat
appParserIssue.lean:12:13: error: unexpected token
f 1 (λ (x : Nat), x) : Nat