Was any breakage caused by 9.14?
Haskell Community [Unofficial]
April 9, 2026
Thanks for the info about proarrow. I have started the GHC 9.14 breakage inventory and added it:
github.com/tomjaguarpaw/tilapia
breakage-inventory-ghc-9.14.md
master
# GHC 9.14 breakage inventory
A catalogue of all the non-trivial fixes (that is, not just bounds
bumps) required to upgrade Haskell code that worked with GHC 9.10 to
GHC 9.14. The [GHC 9.14 migration
guide](https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.14)
contains a list of changes that the GHC team anticipated ahead of time
were capable of causing breakage whereas this breakage inventory is a
report of breakage that actually happened in practice.
## `base`
### Regression in `$`
In corner cases, expressions using `$` which previously type checked
no longer type check.
This issue is fixed in GHC `HEAD` and the fix may be backported to a
GHC 9.14 point release.
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