Source.Defix.hs: Non-exhaustive patterns in lambda

[erikd]

Simple program:

main ()
 = do	list = [1, 2, 3]
	println $ "list " % list % " : " $ show list

currently fails with the error message:

ddc: src/Source/Defix.hs:94:16-31: Non-exhaustive patterns in lambda

The program is wrong but should display a better error message.