compiler/GHC.hs · ghc-9.6.1-alpha3 · Bartłomiej Cieślar / GHC-dev

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2 years ago

d9e8c39d

Detect family instance orphans correctly · d9e8c39d

Simon Peyton Jones authored 2 years ago and

Matthew Pickering committed 2 years ago

We were treating a type-family instance as a non-orphan if there
was a type constructor on its /right-hand side/ that was local. Boo!
Utterly wrong. With this patch, we correctly check the /left-hand side/
instead!

Fixes #22717

(cherry picked from commit 638277ba)

d9e8c39d

History

Detect family instance orphans correctly

Simon Peyton Jones authored 2 years ago and

Matthew Pickering committed 2 years ago

We were treating a type-family instance as a non-orphan if there
was a type constructor on its /right-hand side/ that was local. Boo!
Utterly wrong. With this patch, we correctly check the /left-hand side/
instead!

Fixes #22717

(cherry picked from commit 638277ba)

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