[("tests/examples/Lambda19.hs:1:10: Warning: Collapse lambdas\nFound:\n  \\ x -> \\ x -> foo x x\nWhy not:\n  \\ _ x -> foo x x\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 = 0, startCol = 0, endLine = 0, endCol = 0}),("b",SrcSpan {startLine = 1, startCol = 17, endLine = 1, endCol = 18})], orig = "\\ _ b -> body"}])]