I have a haskell file test.hs. In this file I have written a function
doubleMe x: x + x
this is the only function in this file test.hs. In the ghci command prompt I have typed ":l test.hs" without quotes. The following error comes up:
compiling main <test.hs interpreted>
test.hs:1:1 Parse error: naked expression at top level
Failed: modules loaded:none
What will be the cause of this error.
I have gone through Haskell Error - Naked Expression at Top Level
and
what is parse error: naked expression at top level?
It did not help.
You need =
rather than :
, so:
doubleMe x = x + x
If you try to use :
, GHC parses this as using the :
operator on doubleMe x
and x + x
. This is a function application, so it is an expression (an expression is basically a series of tokens that has a result). Since it isn't wrapped in a function or variable declaration it is a "naked expression", and this is an error.
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