Ambiguous type variable arising from fractional literal
This compiles
{-# LANGUAGE NoImplicitPrelude #-}
module Bug where
one = 1
this does not
{-# LANGUAGE NoImplicitPrelude #-}
module Bug where
pi = 3.1415
[1 of 1] Compiling Bug ( Bug.hs, Bug.o )
Bug.hs:5:6: error:
• Ambiguous type variable ‘p0’ arising from the literal ‘3.1415’
prevents the constraint ‘(GHC.Real.Fractional
p0)’ from being solved.
Relevant bindings include pi :: p0 (bound at Bug.hs:5:1)
Probable fix: use a type annotation to specify what ‘p0’ should be.
These potential instance exist:
one instance involving out-of-scope types
(use -fprint-potential-instances to see them all)
• In the expression: 3.1415
In an equation for ‘pi’: pi = 3.1415
|
5 | pi = 3.1415
| ^^^^^^