6.12.1. Switching off the Monomorphism Restriction

MonomorphismRestriction

Apply the monomorphism restriction to bindings lacking explicit type signatures.

Haskell’s monomorphism restriction (see Section 4.5.5 of the Haskell Report) can be completely switched off by NoMonomorphismRestriction. Since GHC 7.8.1, the monomorphism restriction is switched off by default in GHCi’s interactive options (see Setting options for interactive evaluation only).

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https://downloads.haskell.org/~ghc/9.12.1/docs/users_guide/exts/monomorphism.html