[Agda] [ANNOUNCE] Agda 2.6.1 release candidate 1

[mechvel at scico.botik.ru]

On 2019-12-22 14:41, Andres Sicard Ramirez wrote:
> Dear all,
> 
> The Agda Team is very pleased to announce the first release candidate
> of Agda 2.6.1. We plan to release 2.6.1 in three weeks.
> [..]

This Agda-2.6.0.1.20191219 reports "Termination checking failed ..." for

--------------------------------
_+ms_ :  Op₂ (List Mon)
[]                  +ms mons'                  =  mons'
mons                +ms []                     =  mons
((monᶜ a e) ∷ mons) +ms ((monᶜ b e') ∷ mons')  with comparePP e e'
...
     | tri> _ _ _ =  (monᶜ a e)  ∷ (mons +ms ((monᶜ b e') ∷ mons'))
... | tri< _ _ _ =  (monᶜ b e') ∷ (((monᶜ a e) ∷ mons) +ms mons')
... | tri≈ _ _ _ =  (monᶜ (a + b)  e) ∷ (mons +ms mons')
--------------------------------

while Agda-2.6.0.1 type-checks this.
Which one is more correct?

Among the arguments for +ms on RHS the first one is smaller by 
construction than in LHS
(for tri>), or the second is smaller by construction than in LHS (for 
tri<),
or each is smaller by construction than in LHS (for tri≈).

--
SM