[("tests/examples/Default4.hs:1:23: Error: Use concatMap\nFound:\n concat . map head\nWhy not:\n concatMap head\n",[Replace {rtype = Expr, pos = SrcSpan {startLine = 1, startCol = 23, endLine = 1, endCol = 40}, subts = [("f",SrcSpan {startLine = 1, startCol = 36, endLine = 1, endCol = 40})], orig = "concatMap f"}])]