Inferred type for hole is not general enough

As noted by @deech in #13050 (closed), inferred types for holes are sometimes not general enough. Example:

Prelude> :set -XNoMonomorphismRestriction -- added this just to make sure
Prelude> :t _ 1 2

<interactive>:1:1: error:
    • Found hole: _ :: Integer -> Integer -> t
      Where: ‘t’ is a rigid type variable bound by
               the inferred type of it :: t at <interactive>:1:1
    • In the expression: _
      In the expression: _ 1 2

A more general type would be (Num a, Num b) => a -> b -> t.

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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