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[4of6] CompilingPrintTest ( PrintTest.hs, PrintTest.o )
PrintTest.hs:110:43:error:•Couldn't match expected type‘t0 ->AbsTest.Prt->Doc’
with actual type‘AbsTest.Prt’•The function ‘prt’ is applied to two arguments,
but its type‘AbsTest.Prt’ has none
In the expression: prt 0 prt
In the first argument of‘concatD’, namely ‘[prt 0 prt]’|110|AbsTest.M prt -> prPrec i 0 (concatD [prt 0 prt])
The problem is that the constructor arguments are lowercase versions of the argument types, e.g. Prt gives prt, which is the name of the printing function.
A solution is to prefix the local variables with an underscore.
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