[("tests/examples/Lambda18.hs:1:10: Warning: Collapse lambdas\nFound:\n  \\ x -> \\ y -> x x y y\nWhy not:\n  \\ x y -> x x y y\n",[Replace {rtype = Expr, pos = SrcSpan {startLine = 1, startCol = 10, endLine = 1, endCol = 29}, subts = [("body",SrcSpan {startLine = 1, startCol = 22, endLine = 1, endCol = 29}),("a",SrcSpan {startLine = 1, startCol = 11, endLine = 1, endCol = 12}),("b",SrcSpan {startLine = 1, startCol = 17, endLine = 1, endCol = 18})], orig = "\\ a b -> body"}])]