This page usages
$ ghci -XNoMonomorphismRestriction
to start the haskell interpreter.
What does XNoMonomorphismRestriction switch mean?
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It turns off the Monomorphism restriction, which restricts values which are not defined using “function notation”¹ to have a non-polymorphic type.
¹ By “not using function notation” I mean that they’re defined as
foo = somethingand notfoo bar = something, i.e. the definition does not contain explicit arguments.