cleanup

Author: kim-em

Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean

@@ -32,7 +32,6 @@ namespace Rat
 
 variable {a b c p q : ℚ}
 
--- FIXME: there is a panic here!
 @[simp] lemma mkRat_nonneg {a : ℤ} (ha : 0 ≤ a) (b : ℕ) : 0 ≤ mkRat a b := by
   simpa using divInt_nonneg ha (Int.natCast_nonneg _)