[Agda] Why the light gray highlighting here?

[Jason -Zhong Sheng- Hu]

because this line does not hold definitionally and you have to prove it. this is just a reminder. this definition itself isn't doing anything wrong.

Thanks,
Jason Hu
https://hustmphrrr.github.io/
________________________________
From: Agda <agda-bounces at lists.chalmers.se> on behalf of David Banas <capn.freako at gmail.com>
Sent: September 29, 2020 10:01 AM
To: Agda mailing list <agda at lists.chalmers.se>
Subject: [Agda] Why the light gray highlighting here?

Hi all,

I'm wondering why the second line in my definition for `xor` below is being partially highlighted in a very light gray background, as shown.

Thanks,
-db

data Bin : Set where
  ⟨⟩ : Bin
  _O : Bin → Bin
  _I : Bin → Bin

_xor_ : Bin → Bin → Bin
⟨⟩    xor y      =  y
x     xor ⟨⟩     =  x
(x O) xor (y O)  = (x xor y) O
(x O) xor (y I)  = (x xor y) I
(x I) xor (y O)  = (x xor y) I
(x I) xor (y I)  = (x xor y) O

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