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Showing content from https://github.com/agda/agda/issues/7662 below:

Using Auto with a goal involving musical coinduction `♭` produces incorrect projection · Issue #7662 · agda/agda · GitHub

When utilizing the old musical coinduction notation, Auto will attempt to fill flat-involved goals with the incorrect projection x .♭, instead of the correct ♭ x.

To replicate: C-c C-a in the hole.

{-# OPTIONS --guardedness #-}
open import Codata.Musical.Notation

data  : Set where
  tt :test : ∞ ⊤  ⊤
test x = {!!}

Produces:

test x = x .♭

Expected:

test x = ♭ x

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