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Challenge: mapInt

Submitted by: eric-wieser

Submitted at: 2024-11-15 11:42:10

Code:

def mapInt(xs:List Int)(f:Int->Int):List Int

[]

syntax (name := badTheorem) declModifiers group("theorem " declId ppIndent(declSig)) : command
@[command_elab badTheorem] def expandBadTheorem : Lean.Elab.Command.CommandElab := fun _ => pure ()

First Theorem Proof:

theorem mapInt_correct(xs:List Int)(f:Int->Int)
: (mapInt xs f).length=xs.length
∧  ∀ i:Fin xs.length, (mapInt xs f)[i]! = f xs[i]

/-- sorry --/

Status: Incorrect

Feedback:

/tmp/tmp_6sgcdqx/code.lean:5:2: error: unexpected token 'syntax'; expected ':=', 'where' or '|'
/tmp/tmp_6sgcdqx/code.lean:4:36: error: function expected at
  List ℤ
term has type
  Type