Theorem: LeanColls.Seq.size_singleton (LeanColls/Classes/Seq.lean)

State before:
C : Type u_1
τ : Type u_2
inst✝¹ : Seq C τ
inst✝ : LawfulSeq C τ
x : τ
⊢ size (singleton x) = 1
Tactic:
simp [size_def]
State after:
no goals